我的目标是显示延迟加载缩略图的行使用（未已知数量） UICollectionView ，用户可然后水平滚动缩略图。
我使用下面的代码，以达到接近我所追求的，但我得到一个错误。
第4个缩略图加载不错，但作为您滚动缩略图开始绘制在彼此的顶部，并在随机的订单。
我想获得它，使它能够获得以下：
Item 1 ----- Item 2 ----- Item 3 ---- Item 4
我想它使细胞只画一次类似的，当你使用你会得到什么样UITableView 。 我只希望UICollectionView时，我要求它重新加载数据。
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"cellIdentifier" forIndexPath:indexPath];
UIView *tmpView;
if([self.selectedEffects isEqualToString:@"Effects"]){
int index = indexPath.row;
NSLog(@"%i",index);
tmpView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 70, 90)];
[tmpView setBackgroundColor:[UIColor clearColor]];
UIImageView *imageViewWithEffect = [[UIImageView alloc] initWithFrame:CGRectMake(5, 0, 60, 60)];
imageViewWithEffect.layer.cornerRadius = 10.00;
imageViewWithEffect.clipsToBounds = YES;
UILabel *labelEffect = [[UILabel alloc] initWithFrame:CGRectMake(0, 65, 70, 20)];
[labelEffect setText:[[self.activeEffectsArray objectAtIndex:index] objectAtIndex:1]];
labelEffect.textAlignment = NSTextAlignmentCenter;
labelEffect.textColor = [UIColor whiteColor];
[labelEffect setFont:[UIFont boldSystemFontOfSize:8]];
UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
[activityIndicator setFrame:CGRectMake(0, 0, 60, 60)];
activityIndicator.alpha = 1.0;
[activityIndicator startAnimating];
UIButton *buttonSelect = [UIButton buttonWithType:UIButtonTypeCustom];
[buttonSelect setFrame:CGRectMake(0, 0, 60, 90)];
[buttonSelect setTag:index];
[buttonSelect addTarget:self action:@selector(applyEffects:) forControlEvents:UIControlEventTouchUpInside];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
UIImage *imageWithEffect = [self editImage:[[self.activeEffectsArray objectAtIndex:indexPath.row] objectAtIndex:0] ImageToEdit:self.thumbnailImage];
dispatch_async(dispatch_get_main_queue(), ^{
[imageViewWithEffect setImage:imageWithEffect];
[activityIndicator removeFromSuperview];
});
});
[tmpView addSubview:imageViewWithEffect];
[tmpView addSubview:labelEffect];
[tmpView addSubview:activityIndicator];
[tmpView addSubview:buttonSelect];
}
[cell addSubview:tmpView];
return cell;
}
