600 lines
23 KiB
Objective-C
600 lines
23 KiB
Objective-C
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "RCTNavigator.h"
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#import "RCTAssert.h"
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#import "RCTConvert.h"
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#import "RCTEventDispatcher.h"
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#import "RCTLog.h"
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#import "RCTNavItem.h"
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#import "RCTUtils.h"
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#import "RCTView.h"
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#import "RCTWrapperViewController.h"
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#import "UIView+ReactKit.h"
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typedef NS_ENUM(NSUInteger, RCTNavigationLock) {
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RCTNavigationLockNone,
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RCTNavigationLockNative,
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RCTNavigationLockJavaScript
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};
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NSInteger kNeverRequested = -1;
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NSInteger kNeverProgressed = -10000;
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@interface UINavigationController ()
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// need to declare this since `UINavigationController` doesnt publicly declare the fact that it implements
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// UINavigationBarDelegate :(
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- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item;
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@end
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// http://stackoverflow.com/questions/5115135/uinavigationcontroller-how-to-cancel-the-back-button-event
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// There's no other way to do this unfortunately :(
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@interface RCTNavigationController : UINavigationController <UINavigationBarDelegate>
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{
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dispatch_block_t _scrollCallback;
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}
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@property (nonatomic, assign) RCTNavigationLock navigationLock;
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@end
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/**
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* In general, `RCTNavigator` examines `_currentViews` (which are React child
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* views), and compares them to `_navigationController.viewControllers` (which
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* are controlled by UIKit).
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*
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* It is possible for JavaScript (`_currentViews`) to "get ahead" of native
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* (`navigationController.viewControllers`) and vice versa. JavaScript gets
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* ahead by adding/removing React subviews. Native gets ahead by swiping back,
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* or tapping the back button. In both cases, the other system is initially
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* unaware. And in both cases, `RCTNavigator` helps the other side "catch up".
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*
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* If `RCTNavigator` sees the number of react children have changed, it
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* pushes/pops accordingly. If `RCTNavigator` sees a `UIKit` driven push/pop, it
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* notifies JavaScript that this has happened, and expects that JavaScript will
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* eventually render more children to match `UIKit`. There's no rush for
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* JavaScript to catch up. But if it does rener anything, it must catch up to
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* UIKit. It cannot deviate.
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*
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* To implement this, we need a lock, which we store on the native thread. This
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* lock allows one of the systems to push/pop views. Whoever wishes to
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* "get ahead" must obtain the lock. Whoever wishes to "catch up" must obtain
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* the lock. One thread may not "get ahead" or "catch up" when the other has
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* the lock. Once a thread has the lock, it can only do the following:
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*
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* 1. If it is behind, it may only catch up.
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* 2. If it is caught up or ahead, it may push or pop.
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*
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*
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* ========= Acquiring The Lock ==========
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*
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* JavaScript asynchronously acquires the lock using a native hook. It might be
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* rejected and receive the return value `false`.
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*
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* We acquire the native lock in `shouldPopItem`, which is called right before
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* native tries to push/pop, but only if JavaScript doesn't already have the
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* lock.
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*
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* ======== While JavaScript Has Lock ====
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*
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* When JavaScript has the lock, we have to block all `UIKit` driven pops:
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*
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* 1. Block back button navigation:
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* - Back button will invoke `shouldPopItem`, from which we return `NO` if
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* JavaScript has the lock.
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* - Back button will respect the return value `NO` and not permit
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* navigation.
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*
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* 2. Block swipe-to-go-back navigation:
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* - Swipe will trigger `shouldPopItem`, but swipe won't respect our `NO`
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* return value so we must disable the gesture recognizer while JavaScript
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* has the lock.
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*
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* ======== While Native Has Lock =======
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*
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* We simply deny JavaScript the right to acquire the lock.
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*
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*
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* ======== Releasing The Lock ===========
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*
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* Recall that the lock represents who has the right to either push/pop (or
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* catch up). As soon as we recognize that the side that has locked has carried
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* out what it scheduled to do, we can release the lock, but only after any
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* possible animations are completed.
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*
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* *IF* a scheduled operation results in a push/pop (not all do), then we can
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* only release the lock after the push/pop animation is complete because
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* UIKit. `didMoveToNavigationController` is invoked when the view is done
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* pushing/popping/animating. Native swipe-to-go-back interactions can be
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* aborted, however, and you'll never see that method invoked. So just to cover
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* that case, we also put an animation complete hook in
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* `animateAlongsideTransition` to make sure we free the lock, in case the
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* scheduled native push/pop never actually happened.
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*
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* For JavaScript:
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* - When we see that JavaScript has "caught up" to `UIKit`, and no pushes/pops
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* were needed, we can release the lock.
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* - When we see that JavaScript requires *some* push/pop, it's not yet done
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* carrying out what it scheduled to do. Just like with `UIKit` push/pops, we
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* still have to wait for it to be done animating
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* (`didMoveToNavigationController` is a suitable hook).
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*
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*/
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@implementation RCTNavigationController
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- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
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{
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RCT_NOT_DESIGNATED_INITIALIZER();
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}
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- (instancetype)initWithNavigationBarClass:(Class)navigationBarClass toolbarClass:(Class)toolbarClass
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{
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RCT_NOT_DESIGNATED_INITIALIZER();
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}
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- (instancetype)initWithRootViewController:(UIViewController *)rootViewController
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{
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RCT_NOT_DESIGNATED_INITIALIZER();
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}
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/**
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* @param callback Callback that is invoked when a "scroll" interaction begins
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* so that `RCTNavigator` can notify `JavaScript`.
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*/
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- (instancetype)initWithScrollCallback:(dispatch_block_t)callback
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{
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if ((self = [super initWithNibName:nil bundle:nil])) {
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_scrollCallback = callback;
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}
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return self;
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}
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/**
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* Invoked when either a navigation item has been popped off, or when a
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* swipe-back gesture has began. The swipe-back gesture doesn't respect the
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* return value of this method. The back button does. That's why we have to
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* completely disable the gesture recognizer for swipe-back while JS has the
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* lock.
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*/
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- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item
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{
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if (self.interactivePopGestureRecognizer.state == UIGestureRecognizerStateBegan) {
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if (self.navigationLock == RCTNavigationLockNone) {
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self.navigationLock = RCTNavigationLockNative;
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if (_scrollCallback) {
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_scrollCallback();
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}
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} else if (self.navigationLock == RCTNavigationLockJavaScript) {
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// This should never happen because we disable/enable the gesture
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// recognizer when we lock the navigation.
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RCTAssert(NO, @"Should never receive gesture start while JS locks navigator");
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}
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} else {
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if (self.navigationLock == RCTNavigationLockNone) {
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// Must be coming from native interaction, lock it - it will be unlocked
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// in `didMoveToNavigationController`
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self.navigationLock = RCTNavigationLockNative;
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if (_scrollCallback) {
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_scrollCallback();
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}
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} else if (self.navigationLock == RCTNavigationLockJavaScript) {
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// This should only occur when JS has the lock, and
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// - JS is driving the pop
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// - Or the back button was pressed
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// TODO: We actually want to disable the backbutton while JS has the
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// lock, but it's not so easy. Even returning `NO` wont' work because it
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// will also block JS driven pops. We simply need to disallow a standard
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// back button, and instead use a custom one that tells JS to pop to
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// length (`currentReactCount` - 1).
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return [super navigationBar:navigationBar shouldPopItem:item];
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}
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}
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return [super navigationBar:navigationBar shouldPopItem:item];
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}
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@end
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@interface RCTNavigator() <RCTWrapperViewControllerNavigationListener, UINavigationControllerDelegate>
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{
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RCTEventDispatcher *_eventDispatcher;
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NSInteger _numberOfViewControllerMovesToIgnore;
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}
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@property (nonatomic, assign) NSInteger previousRequestedTopOfStack;
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// Previous views are only mainted in order to detect incorrect
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// addition/removal of views below the `requestedTopOfStack`
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@property (nonatomic, copy, readwrite) NSArray *previousViews;
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@property (nonatomic, readwrite, strong) NSMutableArray *currentViews;
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@property (nonatomic, readwrite, strong) RCTNavigationController *navigationController;
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/**
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* Display link is used to get high frequency sample rate during
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* interaction/animation of view controller push/pop.
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*
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* - The run loop retains the displayLink.
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* - `displayLink` retains its target.
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* - We use `reactWillDestroy` to remove the `RCTNavigator`'s reference to the
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* `displayLink` and remove the `displayLink` from the run loop.
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*
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*
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* `displayLink`:
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* --------------
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*
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* - Even though we could implement the `displayLink` cleanup without the
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* `reactWillDestroy` hook by adding and removing it from the run loop at the
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* right times (begin/end animation), we need to account for the possibility
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* that the view itself is destroyed mid-interaction. So we always keep it
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* added to the run loop, but start/stop it with interactions/animations. We
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* remove it from the run loop when the view will be destroyed by React.
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*
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* +----------+ +--------------+
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* | run loop o----strong--->| displayLink |
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* +----------+ +--o-----------+
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* | ^
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* | |
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* strong strong
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* | |
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* v |
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* +---------o---+
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* | RCTNavigator |
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* +-------------+
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*
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* `dummyView`:
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* ------------
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* There's no easy way to get a callback that fires when the position of a
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* navigation item changes. The actual layers that are moved around during the
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* navigation transition are private. Our only hope is to use
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* `animateAlongsideTransition`, to set a dummy view's position to transition
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* anywhere from -1.0 to 1.0. We later set up a `CADisplayLink` to poll the
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* `presentationLayer` of that dummy view and report the value as a "progress"
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* percentage.
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*
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* It was critical that we added the dummy view as a subview of the
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* transitionCoordinator's `containerView`, otherwise the animations would not
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* work correctly when reversing the gesture direction etc. This seems to be
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* undocumented behavior/requirement.
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*
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*/
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@property (nonatomic, readonly, assign) CGFloat mostRecentProgress;
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@property (nonatomic, readwrite, strong) CADisplayLink *displayLink;
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@property (nonatomic, readonly, strong) NSTimer *runTimer;
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@property (nonatomic, readonly, assign) NSInteger currentlyTransitioningFrom;
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@property (nonatomic, readonly, assign) NSInteger currentlyTransitioningTo;
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// Dummy view that we make animate with the same curve/interaction as the
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// navigation animation/interaction.
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@property (nonatomic, readonly, strong) UIView *dummyView;
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@end
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@implementation RCTNavigator
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- (instancetype)initWithFrame:(CGRect)frame
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{
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RCT_NOT_DESIGNATED_INITIALIZER();
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}
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- (id)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
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{
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if ((self = [super initWithFrame:CGRectZero])) {
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_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(reportNavigationProgress:)];
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_mostRecentProgress = kNeverProgressed;
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_dummyView = [[UIView alloc] initWithFrame:CGRectZero];
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if (_displayLink) {
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[_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
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_displayLink.paused = YES;
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} else {
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// It's okay to leak this on a build bot.
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RCTLogWarn(@"Failed to create a display link (probably on automated build system) - using an NSTimer for AppEngine instead.");
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_runTimer = [NSTimer scheduledTimerWithTimeInterval:(1.0 / 60.0) target:self selector:@selector(reportNavigationProgress:) userInfo:nil repeats:YES];
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}
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_eventDispatcher = eventDispatcher;
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_previousRequestedTopOfStack = kNeverRequested; // So that we initialize with a push.
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_previousViews = @[];
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_currentViews = [[NSMutableArray alloc] initWithCapacity:0];
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__weak RCTNavigator *weakSelf = self;
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_navigationController = [[RCTNavigationController alloc] initWithScrollCallback:^{
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[weakSelf dispatchFakeScrollEvent];
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}];
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_navigationController.delegate = self;
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RCTAssert([self requestSchedulingJavaScriptNavigation], @"Could not acquire JS navigation lock on init");
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[self addSubview:_navigationController.view];
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[_navigationController.view addSubview:_dummyView];
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}
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return self;
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}
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- (void)reportNavigationProgress:(CADisplayLink *)sender
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{
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if (_currentlyTransitioningFrom != _currentlyTransitioningTo) {
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UIView *topView = _dummyView;
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id presentationLayer = [topView.layer presentationLayer];
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CGRect frame = [presentationLayer frame];
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CGFloat nextProgress = ABS(frame.origin.x);
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// Don't want to spam the bridge, when the user holds their finger still mid-navigation.
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if (nextProgress == _mostRecentProgress) {
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return;
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}
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_mostRecentProgress = nextProgress;
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[_eventDispatcher sendInputEventWithName:@"topNavigationProgress" body:@{
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@"fromIndex": @(_currentlyTransitioningFrom),
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@"toIndex": @(_currentlyTransitioningTo),
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@"progress": @(nextProgress),
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@"target": self.reactTag
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}];
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}
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}
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- (void)dealloc
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{
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_navigationController.delegate = nil;
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}
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- (UIViewController *)backingViewController
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{
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return _navigationController;
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}
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/**
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* See documentation about lock lifecycle. This is only here to clean up
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* swipe-back abort interaction, which leaves us *no* other way to clean up
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* locks aside from the animation complete hook.
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*/
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- (void)navigationController:(UINavigationController *)navigationController
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willShowViewController:(UIViewController *)viewController
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animated:(BOOL)animated
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{
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id<UIViewControllerTransitionCoordinator> tc =
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navigationController.topViewController.transitionCoordinator;
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__weak RCTNavigator *weakSelf = self;
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[tc.containerView addSubview: _dummyView];
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[tc animateAlongsideTransition: ^(id<UIViewControllerTransitionCoordinatorContext> context) {
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RCTWrapperViewController *fromController =
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(RCTWrapperViewController *)[context viewControllerForKey:UITransitionContextFromViewControllerKey];
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RCTWrapperViewController *toController =
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(RCTWrapperViewController *)[context viewControllerForKey:UITransitionContextToViewControllerKey];
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NSUInteger indexOfFrom = [_currentViews indexOfObject:fromController.navItem];
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NSUInteger indexOfTo = [_currentViews indexOfObject:toController.navItem];
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CGFloat destination = indexOfFrom < indexOfTo ? 1.0f : -1.0f;
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_dummyView.frame = CGRectMake(destination, 0.0f, 0.0f, 0.0f);
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_currentlyTransitioningFrom = indexOfFrom;
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_currentlyTransitioningTo = indexOfTo;
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if (indexOfFrom != indexOfTo) {
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_displayLink.paused = NO;
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}
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}
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completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
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[weakSelf freeLock];
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_currentlyTransitioningFrom = 0;
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_currentlyTransitioningTo = 0;
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_dummyView.frame = CGRectMake(0.0f, 0.0f, 0.0f, 0.0f);
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_displayLink.paused = YES;
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// Reset the parallel position tracker
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}];
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}
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- (BOOL)requestSchedulingJavaScriptNavigation
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{
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if (_navigationController.navigationLock == RCTNavigationLockNone) {
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_navigationController.navigationLock = RCTNavigationLockJavaScript;
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_navigationController.interactivePopGestureRecognizer.enabled = NO;
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return YES;
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}
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return NO;
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}
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- (void)freeLock
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{
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_navigationController.navigationLock = RCTNavigationLockNone;
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_navigationController.interactivePopGestureRecognizer.enabled = YES;
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}
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/**
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* A React subview can be inserted/removed at any time, however if the
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* `requestedTopOfStack` changes, there had better be enough subviews present
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* to satisfy the push/pop.
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*/
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- (void)insertReactSubview:(UIView *)view atIndex:(NSInteger)atIndex
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{
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RCTAssert([view isKindOfClass:[RCTNavItem class]], @"RCTNavigator only accepts RCTNavItem subviews");
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RCTAssert(
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_navigationController.navigationLock == RCTNavigationLockJavaScript,
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@"Cannot change subviews from JS without first locking."
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);
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[_currentViews insertObject:view atIndex:atIndex];
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}
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- (NSArray *)reactSubviews
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{
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return _currentViews;
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}
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- (BOOL)isValid
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{
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return _displayLink != nil;
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}
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- (void)invalidate
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{
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// Prevent displayLink from retaining the navigator indefinitely
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[_displayLink invalidate];
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_displayLink = nil;
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_runTimer = nil;
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}
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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_navigationController.view.frame = self.bounds;
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}
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- (void)removeReactSubview:(UIView *)subview
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{
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if (_currentViews.count <= 0 || subview == _currentViews[0]) {
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RCTLogError(@"Attempting to remove invalid RCT subview of RCTNavigator");
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return;
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}
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[_currentViews removeObject:subview];
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}
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- (void)handleTopOfStackChanged
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{
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[_eventDispatcher sendInputEventWithName:@"topNavigateBack" body:@{
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@"target":self.reactTag,
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@"stackLength":@(_navigationController.viewControllers.count)
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}];
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}
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- (void)dispatchFakeScrollEvent
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{
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[_eventDispatcher sendScrollEventWithType:RCTScrollEventTypeMove
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reactTag:self.reactTag
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scrollView:nil
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userData:nil];
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}
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/**
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* Must be overridden because UIKit destroys the views superview link when used
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* as a navigator - it's considered outside the view hierarchy.
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*/
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- (UIView *)reactSuperview
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{
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RCTAssert(self.superview != nil, @"put reactNavSuperviewLink back");
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return self.superview ? self.superview : self.reactNavSuperviewLink;
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}
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- (void)addControllerToClosestParent:(UIViewController *)controller
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{
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if (!controller.parentViewController) {
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id responder = [self.superview nextResponder];
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while (responder && ![responder isKindOfClass:[UIViewController class]]) {
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responder = [responder nextResponder];
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}
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if (responder) {
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[responder addChildViewController:controller];
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[controller didMoveToParentViewController:responder];
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}
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}
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}
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- (void)reactBridgeDidFinishTransaction
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{
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// we can't hook up the VC hierarchy in 'init' because the subviews aren't hooked up yet,
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// so we do it on demand here
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[self addControllerToClosestParent:_navigationController];
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NSInteger viewControllerCount = _navigationController.viewControllers.count;
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// The "react count" is the count of views that are visible on the navigation
|
|
// stack. There may be more beyond this - that aren't visible, and may be
|
|
// deleted/purged soon.
|
|
NSInteger previousReactCount =
|
|
_previousRequestedTopOfStack == kNeverRequested ? 0 : _previousRequestedTopOfStack + 1;
|
|
NSInteger currentReactCount = _requestedTopOfStack + 1;
|
|
|
|
BOOL jsGettingAhead =
|
|
// ----- previously caught up ------ ------ no longer caught up -------
|
|
viewControllerCount == previousReactCount && currentReactCount != viewControllerCount;
|
|
BOOL jsCatchingUp =
|
|
// --- previously not caught up ---- --------- now caught up ----------
|
|
viewControllerCount != previousReactCount && currentReactCount == viewControllerCount;
|
|
BOOL jsMakingNoProgressButNeedsToCatchUp =
|
|
// --- previously not caught up ---- ------- still the same -----------
|
|
viewControllerCount != previousReactCount && currentReactCount == previousReactCount;
|
|
BOOL jsMakingNoProgressAndDoesntNeedTo =
|
|
// --- previously caught up -------- ------- still caught up ----------
|
|
viewControllerCount == previousReactCount && currentReactCount == previousReactCount;
|
|
|
|
BOOL reactPushOne = jsGettingAhead && currentReactCount == previousReactCount + 1;
|
|
BOOL reactPopN = jsGettingAhead && currentReactCount < previousReactCount;
|
|
|
|
// We can actually recover from this situation, but it would be nice to know
|
|
// when this error happens. This simply means that JS hasn't caught up to a
|
|
// back navigation before progressing. It's likely a bug in the JS code that
|
|
// catches up/schedules navigations. Eventually, let's recover from this
|
|
// error state, but in the mean time, let's get notified about any JS bugs.
|
|
RCTAssert(
|
|
jsGettingAhead ||
|
|
jsCatchingUp ||
|
|
jsMakingNoProgressButNeedsToCatchUp ||
|
|
jsMakingNoProgressAndDoesntNeedTo,
|
|
@"JS has only made partial progress to catch up to UIKit"
|
|
);
|
|
NSAssert(
|
|
currentReactCount <= _currentViews.count,
|
|
@"Cannot adjust current top of stack beyond available views"
|
|
);
|
|
|
|
// Views before the previous react count must not have changed. Views greater than previousReactCount
|
|
// up to currentReactCount may have changed.
|
|
for (NSInteger i = 0; i < MIN(_currentViews.count, MIN(_previousViews.count, previousReactCount)); i++) {
|
|
NSAssert(_currentViews[i] == _previousViews[i], @"current view should equal previous view");
|
|
}
|
|
RCTAssert(currentReactCount >= 1, @"should be at least one current view");
|
|
if (jsGettingAhead) {
|
|
if (reactPushOne) {
|
|
UIView *lastView = [_currentViews lastObject];
|
|
RCTWrapperViewController *vc = [[RCTWrapperViewController alloc] initWithNavItem:(RCTNavItem *)lastView eventDispatcher:_eventDispatcher];
|
|
vc.navigationListener = self;
|
|
_numberOfViewControllerMovesToIgnore = 1;
|
|
[_navigationController pushViewController:vc animated:(currentReactCount > 1)];
|
|
} else if (reactPopN) {
|
|
UIViewController *viewControllerToPopTo = [[_navigationController viewControllers] objectAtIndex:(currentReactCount - 1)];
|
|
_numberOfViewControllerMovesToIgnore = viewControllerCount - currentReactCount;
|
|
[_navigationController popToViewController:viewControllerToPopTo animated:YES];
|
|
} else {
|
|
RCTAssert(NO, @"Pushing or popping more than one view at a time from JS");
|
|
}
|
|
} else if (jsCatchingUp) {
|
|
[self freeLock]; // Nothing to push/pop
|
|
} else {
|
|
// Else, JS making no progress, could have been unrelated to anything nav.
|
|
return;
|
|
}
|
|
|
|
_previousViews = [_currentViews copy];
|
|
_previousRequestedTopOfStack = _requestedTopOfStack;
|
|
}
|
|
|
|
|
|
// TODO: This will likely fail when performing multiple pushes/pops. We must
|
|
// free the lock only after the *last* push/pop.
|
|
- (void)wrapperViewController:(RCTWrapperViewController *)wrapperViewController
|
|
didMoveToNavigationController:(UINavigationController *)navigationController
|
|
{
|
|
if (self.superview == nil) {
|
|
// If superview is nil, then a JS reload (Cmd+R) happened
|
|
// while a push/pop is in progress.
|
|
return;
|
|
}
|
|
|
|
RCTAssert(
|
|
(navigationController == nil || [_navigationController.viewControllers containsObject:wrapperViewController]),
|
|
@"if navigation controller is not nil, it should container the wrapper view controller"
|
|
);
|
|
RCTAssert(_navigationController.navigationLock == RCTNavigationLockJavaScript ||
|
|
_numberOfViewControllerMovesToIgnore == 0,
|
|
@"If JS doesn't have the lock there should never be any pending transitions");
|
|
/**
|
|
* When JS has the lock we want to keep track of when the request completes
|
|
* the pending transition count hitting 0 signifies this, and should always
|
|
* remain at 0 when JS does not have the lock
|
|
*/
|
|
if (_numberOfViewControllerMovesToIgnore > 0) {
|
|
_numberOfViewControllerMovesToIgnore -= 1;
|
|
}
|
|
if (_numberOfViewControllerMovesToIgnore == 0) {
|
|
[self handleTopOfStackChanged];
|
|
[self freeLock];
|
|
}
|
|
}
|
|
|
|
@end
|