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Fixed possible inconsistency in view hierarchy caused by deleting animation 

Summary:
This diff fixes a possibly inconsistent state of view hierarchy caused by async delayed deleting manipulation on UIView's tree.
Even if new approach may seem tricky, the previous one was just terribly wrong.

Reviewed By: javache

Differential Revision: D5374670

fbshipit-source-id: 36f27330aa8b0e4e00fe43739afe3bc6a8602e30
This commit is contained in:
Valentin Shergin 2017-07-06 12:02:58 -07:00 committed by Facebook Github Bot
parent 2c9e113f8e
commit 2be921c88a
1 changed files with 16 additions and 23 deletions
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39
React/Modules/RCTUIManager.m
View File

@ -65,7 +65,6 @@ NSString *const RCTUIManagerRootViewKey = @"RCTUIManagerRootViewKey";
// Animation
RCTLayoutAnimationGroup *_layoutAnimationGroup; // Main thread only
NSMutableSet<UIView *> *_viewsToBeDeleted; // Main thread only
NSMutableDictionary<NSNumber *, RCTShadowView *> *_shadowViewRegistry; // RCT thread only
NSMutableDictionary<NSNumber *, UIView *> *_viewRegistry; // Main thread only
@ -156,8 +155,6 @@ RCT_EXPORT_MODULE()
_bridgeTransactionListeners = [NSMutableSet new];
_observerCoordinator = [RCTUIManagerObserverCoordinator new];
_viewsToBeDeleted = [NSMutableSet new];
// Get view managers from bridge
NSMutableDictionary *componentDataByName = [NSMutableDictionary new];
for (Class moduleClass in _bridge.moduleClasses) {
@ -695,8 +692,7 @@ RCT_EXPORT_METHOD(removeSubviewsFromContainerWithID:(nonnull NSNumber *)containe
void (^completion)(BOOL) = ^(BOOL finished) {
completionsCalled++;
[self->_viewsToBeDeleted removeObject:removedChild];
[container removeReactSubview:removedChild];
[removedChild removeFromSuperview];
if (animation.callback && completionsCalled == children.count) {
animation.callback(@[@(finished)]);
@ -707,10 +703,20 @@ RCT_EXPORT_METHOD(removeSubviewsFromContainerWithID:(nonnull NSNumber *)containe
}
};
[_viewsToBeDeleted addObject:removedChild];
// Hack: At this moment we have two contradict intents.
// First one: We want to delete the view from view hierarchy.
// Second one: We want to animate this view, which implies the existence of this view in the hierarchy.
// So, we have to remove this view from React's view hierarchy but postpone removing from UIKit's hierarchy.
// Here the problem: the default implementation of `-[UIView removeReactSubview:]` also removes the view from UIKit's hierarchy.
// So, let's temporary restore the view back after removing.
// To do so, we have to memorize original `superview` (which can differ from `container`) and an index of removed view.
UIView *originalSuperview = removedChild.superview;
NSUInteger *originalIndex = [originalSuperview.subviews indexOfObject:removedChild];
[container removeReactSubview:removedChild];
[originalSuperview insertSubview:removedChild atIndex:originalIndex];
// Disable user interaction while the view is animating since JS won't receive
// the view events anyway.
// Disable user interaction while the view is animating
// since the view is (conseptually) deleted and not supposed to be interactive.
removedChild.userInteractionEnabled = NO;
NSString *property = deletingLayoutAnimation.property;
@ -862,6 +868,7 @@ RCT_EXPORT_METHOD(manageChildren:(nonnull NSNumber *)containerTag
for (NSInteger index = 0, length = temporarilyRemovedChildren.count; index < length; index++) {
destinationsToChildrenToAdd[moveToIndices[index]] = temporarilyRemovedChildren[index];
}
for (NSInteger index = 0, length = addAtIndices.count; index < length; index++) {
id<RCTComponent> view = registry[addChildReactTags[index]];
if (view) {
@ -872,22 +879,8 @@ RCT_EXPORT_METHOD(manageChildren:(nonnull NSNumber *)containerTag
NSArray<NSNumber *> *sortedIndices =
[destinationsToChildrenToAdd.allKeys sortedArrayUsingSelector:@selector(compare:)];
for (NSNumber *reactIndex in sortedIndices) {
NSInteger insertAtIndex = reactIndex.integerValue;
// When performing a delete animation, views are not removed immediately
// from their container so we need to offset the insertion index if a view
// that will be removed appears earlier than the view we are inserting.
if (isUIViewRegistry && _viewsToBeDeleted.count > 0) {
for (NSInteger index = 0; index < insertAtIndex; index++) {
UIView *subview = ((UIView *)container).reactSubviews[index];
if ([_viewsToBeDeleted containsObject:subview]) {
insertAtIndex++;
}
}
}
[container insertReactSubview:destinationsToChildrenToAdd[reactIndex]
atIndex:insertAtIndex];
atIndex:reactIndex.integerValue];
}
}