react-native/Libraries/Wrapper/RCTWrapperViewControllerHostingView.m at master · devagul93/react-native · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RCTWrapperViewControllerHostingView.h"

#import <React/UIView+React.h>

#pragma mark - UIViewController+Children

@interface UIViewController (Children)

@property (nonatomic, readonly) BOOL isAttached;
- (void)attachChildViewController:(UIViewController *)childViewController toContainerView:(UIView *)containerView;
- (void)detachChildViewController:(UIViewController *)childViewController;

@end

@implementation UIViewController (Children)

- (BOOL)isAttached
{
  return self.parentViewController != nil;
}

- (void)attachChildViewController:(UIViewController *)childViewController toContainerView:(UIView *)containerView
{
  [self addChildViewController:childViewController];
  // `[childViewController willMoveToParentViewController:self]` is calling automatically
  [containerView addSubview:childViewController.view];
  childViewController.view.frame = containerView.bounds;
  childViewController.view.translatesAutoresizingMaskIntoConstraints = YES;
  childViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  [childViewController didMoveToParentViewController:self];

  [childViewController beginAppearanceTransition:true animated:false];
  [childViewController endAppearanceTransition];
}

- (void)detachChildViewController:(UIViewController *)childViewController
{
  [childViewController beginAppearanceTransition:false animated: false];
  [childViewController endAppearanceTransition];

  [childViewController willMoveToParentViewController:nil];
  [childViewController.view removeFromSuperview];
  [childViewController removeFromParentViewController];
  // `[childViewController didMoveToParentViewController:nil]` is calling automatically
}

@end

@implementation RCTWrapperViewControllerHostingView {
  UIViewController *_Nullable _contentViewController;
}

#pragma mark - `contentViewController`

- (nullable UIViewController *)contentViewController
{
  return _contentViewController;
}

- (void)setContentViewController:(UIViewController *)contentViewController
{

  if (_contentViewController) {
    [self detachContentViewControllerIfNeeded];
  }

  _contentViewController = contentViewController;

  if (_contentViewController) {
    [self attachContentViewControllerIfNeeded];
  }
}

#pragma mark - Attaching and Detaching

- (void)attachContentViewControllerIfNeeded
{
  if (self.contentViewController.isAttached) {
    return;
  }

  [self.reactViewController attachChildViewController:self.contentViewController toContainerView:self];
}

- (void)detachContentViewControllerIfNeeded
{
  if (!self.contentViewController.isAttached) {
    return;
  }

  [self.reactViewController detachChildViewController:self.contentViewController];
}

#pragma mark - Life cycle

- (void)willMoveToWindow:(UIWindow *)newWindow
{
  if (newWindow == nil) {
    [self detachContentViewControllerIfNeeded];
  }
}

- (void)didMoveToWindow
{
  [super didMoveToWindow];
  [self attachContentViewControllerIfNeeded];
}

#pragma mark - Layout

- (void)setNeedsLayout
{
  [super setNeedsLayout];
  [self.superview setNeedsLayout];
}

- (CGSize)intrinsicContentSize
{
  return self.contentViewController.view.intrinsicContentSize;
}

- (CGSize)sizeThatFits:(CGSize)size
{
  return [self.contentViewController.view sizeThatFits:size];
}

@end