拥有集合视图并尝试在集合视图单元格中显示组文件夹中的图像。索引方面,它应该从 0 开始,但它显示来自索引 1 的图像,并且索引 0 处的集合视图单元格显示为空。
- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;
{
return 6;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
Cell *cell = [cv dequeueReusableCellWithReuseIdentifier:kCellID forIndexPath:indexPath];
// make the cell's title the actual NSIndexPath value
cell.label.text = [NSString stringWithFormat:@"{%ld,%ld}", (long)indexPath.row, (long)indexPath.section];
// load the image for this cell
NSString *imageToLoad = [NSString stringWithFormat:@"%d.jpg", indexPath.row];
cell.image.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
{
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];
NSString *pathToImage = [[NSBundle mainBundle] pathForResource:imageNameToLoad ofType:@"jpg"];
UIImage *image = [[UIImage alloc] initWithContentsOfFile:pathToImage];
DetailViewController *detailViewController = [segue destinationViewController];
detailViewController.image = image;
}
}
为什么索引 0 处的单元格没有显示图像。集合视图显示来自索引 1 的单元格的图像,但从 0 开始除外。我在我的代码中做错了什么。
感谢所有帮助。