didSelectRowAtIndexPath方法在我的应用程序中不起作用.我没有使用NSLog打印任何输出：
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
PFObject *imageObject = [self.imageFilesArray objectAtIndex:indexPath.row];
PFFile *imageFile = [imageObject objectForKey:@"file"];
[imageFile getDataInBackgroundWithBlock:^(NSData *data,NSError *error) {
if (!error) {
cell.imageView.image = [UIImage imageWithData:data];
}
}];
return cell;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
NSLog(@"didSelectRowAtIndexPath");
cell.imageView.image = self.image;
return cell;
}
我希望当我点击一个单元格时,选择图像,并将图像赋予self.image.
我们能用segue做到吗？因为我的didSelectRowAtIndexPath方法根本不起作用.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showPhotoDetail"]) {
NSLog(@"SEGUE showPhotoDetail");
UICollectionViewCell *cell = sender;
NSIndexPath *indexPath = [self.collectionView indexPathForCell:cell];
PhotoDetailViewController *photoDetailViewController = (PhotoDetailViewController *)segue.destinationViewController;
photoDetailViewController.truckImage = self.image;
//[UIImage imageNamed:[self.imageFilesArray objectAtIndex:indexPath.row] ];
NSLog(@"%@",photoDetailViewController.truckImage);
}
}
解决方法
选择Item的方法签名是错误的,正确的方法签名就是这个
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
编辑
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
PhotoCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
self.image = cell.imageView.image;
}
编辑2
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showPhotoDetail"]) {
// get index path of selected cell
NSIndexPath *indexPath = [collectionView.indexPathsForSelectedItems objectAtIndex:0];
// get the cell object
PhotoCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
// get image from selected cell
self.image = cell.imageView.image;
}
}
