问题
I have a collection view. I would like to programmatically select a cell. This is the code I use
[_collectionView selectItemAtIndexPath:[NSIndexPath indexPathForItem:currentSelectedVideo inSection:0] animated:YES scrollPosition:UICollectionViewScrollPositionNone];
For some reason the functions:
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
Are not called and therefore the visual effect I am using for showing the selected cell is not shown on the screen.
Is it a proper behavior?
回答1:
Yes, this is proper behaviour. Documentation for [selectItemAtIndexPath:animated:scrollPosition:] says:
This method does not cause any selection-related delegate methods to be called.
回答2:
You can make it.
[self.collectionView selectItemAtIndexPath:indexPath animated:YES scrollPosition:UICollectionViewScrollPositionNone];
[self collectionView:self.collectionView didSelectItemAtIndexPath:indexPath];
if use only selectItemAtIndexPath:animated:scrollPosition: method, don't call delegate method. if use only collectionView:didSelectItemAtIndexPath: method, it don't work stabil
happy code :)
回答3:
Osmenda's answer in Swift with my custom collection view:
self.collectionView(calendarCV, didSelectItemAtIndexPath: indexPath)
回答4:
Swift 4:
self.collectionView(daysCollectionView, didSelectItemAt: indexPath)
来源：https://stackoverflow.com/questions/19366637/uicollectionview-selectitematindexpath-doesnt-call-didselectitematindexpath