Ios CollectionView大小在数据重新加载之前以popover segue显示时是错误的
我在我的故事板上设置了一个segue作为Popover。destinationViewController是嵌入在NavigationController中的UICollectionViewController。当Popover视图加载时，my collectionView报告它的大小基本上是iPad窗口的全尺寸。但是，一旦我调用[self.collectionView reloadData]，collectionView就会正确地将其大小视为PopOverview控制器的大小。下面是我用来调整collectionViewCell大小的方法，它基于collectionView的大小Ios CollectionView大小在数据重新加载之前以popover segue显示时是错误的,ios,ipad,uicollectionview,uistoryboard,uipopovercontroller,Ios,Ipad,Uicollectionview,Uistoryboard,Uipopovercontroller,我在我的故事板上设置了一个segue作为Popover。destinationViewController是嵌入在NavigationController中的UICollectionViewController。当Popover视图加载时，my collectionView报告它的大小基本上是iPad窗口的全尺寸。但是，一旦我调用[self.collectionView reloadData]，collectionView就会正确地将其大小视为PopOverview控制器的大小。下面是我用来调整
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CGSize collectionViewBounds = collectionView.bounds.size; //768x1004 when the Popover is first loaded
//400x644 after reloadData is called
int navigationHeight = self.navigationController.navigationBar.bounds.size.height;
int toolbarHeight = self.navigationController.toolbar.bounds.size.height;
int statusBarHeight = [UIApplication sharedApplication].statusBarFrame.size.height;
int cellHeight = collectionViewBounds.height - (navigationHeight + statusBarHeight + toolbarHeight);
int cellWidth = collectionViewBounds.width;
return CGSizeMake(cellWidth, cellHeight);
}
- (void) snapToCellAtIndex:(NSIndexPath *)index withAnimation:(BOOL) animated
{
[self.collectionView scrollToItemAtIndexPath:index atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:animated];
}