我正在使用UICollectionView来展示手机相册中的所有图片。
当我点击任意一张图片时,该图片会翻转并显示有关该图片的一些信息。
当用户再次点击同一张图片时,图像再次翻转并显示原始图像。
问题在于,每当我通过UICollectionView向下滚动时,最后选择的图片会自动翻转,并显示有关该图片的信息。
如何解决这个问题。
以下是一些代码:
- (void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell1 = [collectionView cellForItemAtIndexPath:indexPath];
if(old_path!=NULL){
UICollectionViewCell *cell2 = [collectionView cellForItemAtIndexPath:old_path];
[UIView transitionFromView:cell2.selectedBackgroundView toView:cell2.contentView duration:0.5 options:UIViewAnimationOptionCurveLinear |UIViewAnimationOptionTransitionFlipFromLeft completion:nil];
}
if(old_path==indexPath&&flag)
{
[cell1 setSelected:NO];
[UIView transitionFromView:cell1.selectedBackgroundView toView:cell1.contentView duration:0.5 options:UIViewAnimationOptionCurveLinear |UIViewAnimationOptionTransitionFlipFromLeft completion:nil];
flag=FALSE;
}
else{
[UIView transitionFromView:cell1.contentView toView:cell1.selectedBackgroundView duration:0.5 options:UIViewAnimationOptionCurveLinear |UIViewAnimationOptionTransitionFlipFromLeft completion:nil];
flag=TRUE;
}
old_path=indexPath;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
ALAsset *asset = assets[indexPath.row];
NSLog(@"Description : %@",[asset description]);
UIImage *img=[self imageWithImage:[UIImage imageWithCGImage:[asset thumbnail]] convertToSize:CGSizeMake(150, 150)];
UIView *contents = [[UIView alloc]initWithFrame:cell.bounds];
contents.backgroundColor = [UIColor colorWithPatternImage:img];
[cell.contentView addSubview:contents];
UIView *backgroundView = [[UIView alloc]initWithFrame:cell.bounds];
backgroundView.backgroundColor = [UIColor yellowColor];
UIButton *del=[UIButton buttonWithType:UIButtonTypeRoundedRect];
del.frame= CGRectMake(backgroundView.frame.origin.x+20, backgroundView.frame.origin.y+20, 100, 40);
[del setTitle:@"Delete" forState:UIControlStateNormal];
[del addTarget:self action:@selector(delete) forControlEvents:UIControlEventTouchUpInside];
[backgroundView addSubview:del];
UIButton *cancel=[UIButton buttonWithType:UIButtonTypeRoundedRect];
cancel.frame= CGRectMake(backgroundView.frame.origin.x+20, backgroundView.frame.origin.y+80, 100, 45);
[cancel setTitle:@"Cancel" forState:UIControlStateNormal];
[cancel addTarget:self action:@selector(cancel) forControlEvents:UIControlEventTouchUpInside];
[backgroundView addSubview:cancel];
cell.selectedBackgroundView = backgroundView;
[cell bringSubviewToFront:cell.selectedBackgroundView];
return cell;
}
这里,old_path 包含最后选定图片的索引。