点击时 UICollectionViewCell 不显示 DetailView

Posted 2023-03-14

【中文标题】点击时 UICollectionViewCell 不显示 DetailView

【英文标题】：UICollectionViewCell is not showing DetailView when tapped

【发布时间】：2012-12-06 12:05:34

【问题描述】：

我在单元格中实现了一个带有 ImageViews 的 CollectionView。我希望在点击单元格时出现 DetailViewController。我在 ImageView 和 Cell 的 Interface Builder 中设置了 User Interaction Enabled。我做错了什么？我在 ViewController 中有这段代码：

- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;

    return 9;


- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;


    PhotosCell *cell = [cv dequeueReusableCellWithReuseIdentifier:kCellID forIndexPath:indexPath];



    // load the image for this cell
    NSString *imageToLoad = [NSString stringWithFormat:@"%d.jpg", indexPath.row +1];
    // NSLog(imageToLoad);
    cell.imageView.image = [UIImage imageNamed:imageToLoad];

    return cell;


// the user tapped a collection item, load and set the image on the detail view controller
//
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

   // NSLog(@"inside!");
    if ([[segue identifier] isEqualToString:@"showDetail"])
    
        NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] objectAtIndex:0];

        // load the image, to prevent it from being cached we use 'initWithContentsOfFile'
        NSString *imageNameToLoad = [NSString stringWithFormat:@"%d_full", selectedIndexPath.row+1];
        NSString *pathToImage = [[NSBundle mainBundle] pathForResource:imageNameToLoad ofType:@".jpg"];
        UIImage *image = [[UIImage alloc] initWithContentsOfFile:pathToImage];

        PhotoDetailViewController *detailViewController = [segue destinationViewController];
        detailViewController.myImage = image;
    

但是当点击单元格时没有调用方法“prepareForSegue”...

【参考方案1】：

实现collectionview委托方法

collectionView:didSelectItemAtIndexPath:

来电

[self performSegueWithIdentifier:@"showDetail" sender:self];

【讨论】：

是的，解决了！ :) 谢谢