UICollectionView didSelectRowAtIndexPath不起作用

Question

didSelectRowAtIndexPath方法在我的应用中无效。我无法使用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;
}

我想点击一个单元格，选择图像，然后将图像提供给self.image。

我们可以在segue中做到吗？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);
    }
}

Answer 1

选择项目的方法签名是错误的，正确的方法签名是这个

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

More Info here

修改

尝试此代码以获取所选图像。

- (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;
    }
}