react-native/React/Views/RCTModalHostView.m

/**
 * 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 "RCTModalHostView.h"

#import "RCTAssert.h"
#import "RCTBridge.h"
#import "RCTModalHostViewController.h"
#import "RCTTouchHandler.h"
#import "RCTUIManager.h"
#import "UIView+React.h"

@implementation RCTModalHostView
{
  __weak RCTBridge *_bridge;
  BOOL _isPresented;
  RCTModalHostViewController *_modalViewController;
  RCTTouchHandler *_touchHandler;
  UIView *_reactSubview;
}

RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:coder)

- (instancetype)initWithBridge:(RCTBridge *)bridge
{
  if ((self = [super initWithFrame:CGRectZero])) {
    _bridge = bridge;
    _modalViewController = [RCTModalHostViewController new];
    UIView *containerView = [UIView new];
    containerView.autoresizingMask =  UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    _modalViewController.view = containerView;
    _touchHandler = [[RCTTouchHandler alloc] initWithBridge:bridge];
    _isPresented = NO;

    __weak typeof(self) weakSelf = self;
    _modalViewController.boundsDidChangeBlock = ^(CGRect newBounds) {
      [weakSelf notifyForBoundsChange:newBounds];
    };
  }

  return self;
}

- (void)notifyForBoundsChange:(CGRect)newBounds
{
  if (_reactSubview && _isPresented) {
    [_bridge.uiManager setFrame:newBounds forView:_reactSubview];
  }
}

- (NSArray<UIView *> *)reactSubviews
{
  return _reactSubview ? @[_reactSubview] : @[];
}

- (void)insertReactSubview:(UIView *)subview atIndex:(__unused NSInteger)atIndex
{
  RCTAssert(_reactSubview == nil, @"Modal view can only have one subview");
  [subview addGestureRecognizer:_touchHandler];
  subview.autoresizingMask = UIViewAutoresizingFlexibleHeight |
                             UIViewAutoresizingFlexibleWidth;

  [_modalViewController.view insertSubview:subview atIndex:0];
  _reactSubview = subview;
}

- (void)removeReactSubview:(UIView *)subview
{
  RCTAssert(subview == _reactSubview, @"Cannot remove view other than modal view");
  [subview removeGestureRecognizer:_touchHandler];
  [subview removeFromSuperview];
  _reactSubview = nil;
}

- (void)dismissModalViewController
{
  if (_isPresented) {
    [_modalViewController dismissViewControllerAnimated:self.animated completion:nil];
    _isPresented = NO;
  }
}

- (void)didMoveToWindow
{
  [super didMoveToWindow];

  if (!_isPresented && self.window) {
    RCTAssert(self.reactViewController, @"Can't present modal view controller without a presenting view controller");
    [self.reactViewController presentViewController:_modalViewController animated:self.animated completion:^{
      if (_onShow) {
        _onShow(nil);
      }
    }];
    _isPresented = YES;
  }
}

- (void)didMoveToSuperview
{
  [super didMoveToSuperview];

  if (_isPresented && !self.superview) {
    [self dismissModalViewController];
  }
}

- (void)invalidate
{
  dispatch_async(dispatch_get_main_queue(), ^{
    [self dismissModalViewController];
  });
}

- (BOOL)isTransparent
{
  return _modalViewController.modalPresentationStyle == UIModalPresentationCustom;
}

- (void)setTransparent:(BOOL)transparent
{
  _modalViewController.modalPresentationStyle = transparent ? UIModalPresentationCustom : UIModalPresentationFullScreen;
}

@end