react-native/React/Views/RCTTabBar.m

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTTabBar.h"
#import "RCTEventDispatcher.h"
#import "RCTLog.h"
#import "RCTTabBarItem.h"
#import "RCTUtils.h"
#import "RCTView.h"
#import "RCTViewControllerProtocol.h"
#import "RCTWrapperViewController.h"
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#import "UIView+React.h"
@interface RCTTabBar() <UITabBarControllerDelegate>
@end
@implementation RCTTabBar
{
BOOL _tabsChanged;
UITabBarController *_tabController;
}
- (instancetype)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame])) {
_tabController = [UITabBarController new];
_tabController.delegate = self;
[self addSubview:_tabController.view];
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)
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- (UIViewController *)reactViewController
{
return _tabController;
}
- (void)dealloc
{
_tabController.delegate = nil;
[_tabController removeFromParentViewController];
}
- (void)insertReactSubview:(RCTTabBarItem *)subview atIndex:(NSInteger)atIndex
{
if (![subview isKindOfClass:[RCTTabBarItem class]]) {
RCTLogError(@"subview should be of type RCTTabBarItem");
return;
}
[super insertReactSubview:subview atIndex:atIndex];
_tabsChanged = YES;
}
- (void)removeReactSubview:(RCTTabBarItem *)subview
{
if (self.reactSubviews.count == 0) {
RCTLogError(@"should have at least one view to remove a subview");
return;
}
[super removeReactSubview:subview];
_tabsChanged = YES;
}
- (void)didUpdateReactSubviews
{
// Do nothing, as subviews are managed by `reactBridgeDidFinishTransaction`
}
- (void)layoutSubviews
{
[super layoutSubviews];
[self reactAddControllerToClosestParent:_tabController];
_tabController.view.frame = self.bounds;
}
- (void)reactBridgeDidFinishTransaction
{
// we can't hook up the VC hierarchy in 'init' because the subviews aren't
// hooked up yet, so we do it on demand here whenever a transaction has finished
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[self reactAddControllerToClosestParent:_tabController];
if (_tabsChanged) {
NSMutableArray<UIViewController *> *viewControllers = [NSMutableArray array];
for (RCTTabBarItem *tab in [self reactSubviews]) {
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UIViewController *controller = tab.reactViewController;
if (!controller) {
controller = [[RCTWrapperViewController alloc] initWithContentView:tab];
}
[viewControllers addObject:controller];
}
_tabController.viewControllers = viewControllers;
_tabsChanged = NO;
}
[self.reactSubviews enumerateObjectsUsingBlock:^(UIView *view, NSUInteger index, __unused BOOL *stop) {
RCTTabBarItem *tab = (RCTTabBarItem *)view;
UIViewController *controller = self->_tabController.viewControllers[index];
if (self->_unselectedTintColor) {
[tab.barItem setTitleTextAttributes:@{NSForegroundColorAttributeName: self->_unselectedTintColor} forState:UIControlStateNormal];
}
[tab.barItem setTitleTextAttributes:@{NSForegroundColorAttributeName: self.tintColor} forState:UIControlStateSelected];
controller.tabBarItem = tab.barItem;
if (tab.selected) {
self->_tabController.selectedViewController = controller;
}
}];
}
- (UIColor *)barTintColor
{
return _tabController.tabBar.barTintColor;
}
- (void)setBarTintColor:(UIColor *)barTintColor
{
_tabController.tabBar.barTintColor = barTintColor;
}
- (UIColor *)tintColor
{
return _tabController.tabBar.tintColor;
}
- (void)setTintColor:(UIColor *)tintColor
{
_tabController.tabBar.tintColor = tintColor;
}
- (BOOL)translucent {
return _tabController.tabBar.isTranslucent;
}
- (void)setTranslucent:(BOOL)translucent {
_tabController.tabBar.translucent = translucent;
}
- (UITabBarItemPositioning)itemPositoning
{
#if TARGET_OS_TV
return 0;
#else
return _tabController.tabBar.itemPositioning;
#endif
}
- (void)setItemPositioning:(UITabBarItemPositioning)itemPositioning
{
#if !TARGET_OS_TV
_tabController.tabBar.itemPositioning = itemPositioning;
#endif
}
#pragma mark - UITabBarControllerDelegate
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
NSUInteger index = [tabBarController.viewControllers indexOfObject:viewController];
RCTTabBarItem *tab = (RCTTabBarItem *)self.reactSubviews[index];
if (tab.onPress) tab.onPress(nil);
return NO;
}
@end