Ios UICollectionView交互转换引发异常
我试图在UICollectionView上实现pinch来扩展,但遇到了一些麻烦。与我能找到的所有示例代码不同,我这样做并不是作为交互式UINavigationController转换的一部分——我只需要在适当的位置展开一个项 这是我的捏手势识别器:Ios UICollectionView交互转换引发异常,ios,objective-c,uicollectionview,Ios,Objective C,Uicollectionview,我试图在UICollectionView上实现pinch来扩展,但遇到了一些麻烦。与我能找到的所有示例代码不同,我这样做并不是作为交互式UINavigationController转换的一部分——我只需要在适当的位置展开一个项 这是我的捏手势识别器: - (void)pinchGestureDidPinch:(UIPinchGestureRecognizer *)recognizer { CGFloat targetScale = 3.0; CGFloat scale = rec
- (void)pinchGestureDidPinch:(UIPinchGestureRecognizer *)recognizer
{
CGFloat targetScale = 3.0;
CGFloat scale = recognizer.scale;
if (recognizer.state == UIGestureRecognizerStateBegan) {
CGPoint point = [recognizer locationInView:self.collectionView];
NSIndexPath *rowUnder = [self.collectionView indexPathForItemAtPoint:point];
self.pinchingRow = [NSIndexPath indexPathForItem:0 inSection:rowUnder.section];
self.currentState = HACStreamViewControllerTransitioning;
self.expandedLayout.expandedSection = self.pinchingRow.section;
self.transitionLayout = [self.collectionView startInteractiveTransitionToCollectionViewLayout:self.expandedLayout completion:nil];
} else if (recognizer.state == UIGestureRecognizerStateEnded || recognizer.state == UIGestureRecognizerStateCancelled) {
if (scale >= targetScale) {
[self.collectionView finishInteractiveTransition];
self.currentState = HACStreamViewControllerExpanded;
} else {
[self.collectionView cancelInteractiveTransition];
self.currentState = HACStreamViewControllerCollapsed;
}
} else {
// change
CGFloat progress = MIN(targetScale / scale, 1.0);
progress = MAX(0.0, progress);
self.transitionLayout.transitionProgress = progress;
[self.transitionLayout invalidateLayout];
}
}
调用StartTinterActivityTransitionToCollectionViewLayout:会导致异常,但:
0 ??? 0x0fcf577f 0x0 + 265246591,
1 UIKit 0x01e1f582 -[UICollectionViewTransitionLayout setTransitionProgress:] + 643,
2 UIKit 0x01d13053 -[UICollectionView _setCollectionViewLayout:animated:isInteractive:completion:] + 658,
3 UIKit 0x01d12be8 -[UICollectionView setCollectionViewLayout:] + 225,
4 UIKit 0x01d15e0a -[UICollectionView startInteractiveTransitionToCollectionViewLayout:completion:] + 821,
5 HAW Couples 0x0001beae -[HACStreamViewController pinchGestureDidPinch:] + 782,
6 UIKit 0x01a74f8c _UIGestureRecognizerSendActions + 230,
7 UIKit 0x01a73c00 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 383,
8 UIKit 0x01a7566d -[UIGestureRecognizer _delayedUpdateGesture] + 60,
9 UIKit 0x01a78bcd ___UIGestureRecognizerUpdate_block_invoke + 57,
10 UIKit 0x01a78b4e _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317,
11 UIKit 0x01a6f248 _UIGestureRecognizerUpdate + 199,
12 UIKit 0x0173bd4a -[UIWindow _sendGesturesForEvent:] + 1291,
13 UIKit 0x0173cc6a -[UIWindow sendEvent:] + 1030,
14 UIKit 0x01710a36 -[UIApplication sendEvent:] + 242,
15 UIKit 0x016fad9f _UIApplicationHandleEventQueue + 11421,
16 CoreFoundation 0x033988af __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15,
17 CoreFoundation 0x0339823b __CFRunLoopDoSources0 + 235,
18 CoreFoundation 0x033b530e __CFRunLoopRun + 910,
19 CoreFoundation 0x033b4b33 CFRunLoopRunSpecific + 467,
20 CoreFoundation 0x033b494b CFRunLoopRunInMode + 123,
21 GraphicsServices 0x042619d7 GSEventRunModal + 192,
22 GraphicsServices 0x042617fe GSEventRun + 104,
23 UIKit 0x016fd94b UIApplicationMain + 1225,
24 HAW Couples 0x0000eefd main + 141,
25 libdyld.dylib 0x03bd5725 start + 0
有关异常的消息:
*** setObjectForKey: object cannot be nil (key: actualAttribute)
我已经验证了我的“目的地”UICollectionViewLayout是否良好。以下备选方案(由轻触触发)工作正常,并按预期设置动画:
[self.collectionView setCollectionViewLayout:self.expandedLayout animated:YES completion:^(BOOL finished) {
}];
我有完全相同的问题,在我的例子中,当一个布局是自定义布局,另一个是UICollectionViewFlowLayout时,会发生此崩溃。我仍在研究这个问题,但我想知道您是否有相同的设置 编辑1)
在自定义布局中,我有一个装饰视图,并在[UICollectionViewLayoutLayoutAttributesForElementsInRect:]操作中返回装饰视图的UICollectionViewLayoutAttributes。我在删除装饰视图的布局属性后进行了测试,现在它工作得很好。一个版面中的装饰视图在另一个版面中不存在,这似乎是一个问题,当我了解更多信息时,我会更新我的答案。是的,我也有同样的问题,这是由于对装饰视图的不正确跟踪。@Kelan您找到解决方案了吗?我在自定义布局之间移动时遇到了这个问题,其中一个具有装饰视图,而另一个没有。