コレクション ビューが reloadItemsAtIndexPaths で performBatchUpdate のときにデバイスを回転すると、コレクション ビューが正しく配置されなくなります。ただし、ビューは一定の位置にとどまります。
この問題を簡単に修正するには:
setting [UIView setAnimationEnabled: NO]; in willRotateToInterfaceOrientation
+
setting [UIView setAnimationEnabled: YES]; in didRotateToInterfaceOrientation
しかし、これがこの問題を解決する良い方法だとは思いません。
誰かがより良い考えを持っていますか?
乾杯。
これが私のコードです:
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
[super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
NSLog(@"Before Rotation");
NSLog(@"collecitonview Rect : %@", NSStringFromCGRect(self.collectionView.frame));
NSLog(@"view Rect : %@", NSStringFromCGRect(self.view.frame));
}
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
[super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
NSLog(@"After Rotation");
NSLog(@"collecitonview Rect : %@", NSStringFromCGRect(self.collectionView.frame));
NSLog(@"view Rect : %@", NSStringFromCGRect(self.view.frame));
}
- (void) viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
for(int i = 0 ; i < 30; i++){
NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
CGFloat hue = arc4random() % 20;
[self.collectionView reloadItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:hue inSection:0]]];
}];
[_operationsArray addObject:operation];
}
[self performUpdate];
}
- (void)performUpdate{
if(_operationsArray.count == 0)return;
[self.collectionView performBatchUpdates:^{
NSBlockOperation *operation = (NSBlockOperation*)[_operationsArray firstObject];
[operation start];
} completion:^(BOOL finished) {
if(_operationsArray.count != 0){
[_operationsArray removeObjectAtIndex:0];
[self performUpdate];
}
}];
}
出力: (更新の実行中にデバイスを回転させた場合)
2013-10-16 17:05:18.445 collectionviewbatchupdateTest[90419:a0b] Before Rotation
2013-10-16 17:05:18.446 collectionviewbatchupdateTest[90419:a0b] collecitonview Rect : {{0, 0}, {1024, 768}}
2013-10-16 17:05:18.446 collectionviewbatchupdateTest[90419:a0b] view Rect : {{0, 0}, {768, 1024}}
2013-10-16 17:05:18.851 collectionviewbatchupdateTest[90419:a0b] After Rotation
2013-10-16 17:05:18.851 collectionviewbatchupdateTest[90419:a0b] collecitonview Rect : {{-128, 0}, {1024, 1024}}
2013-10-16 17:05:18.852 collectionviewbatchupdateTest[90419:a0b] view Rect : {{0, 0}, {768, 1024}}