相关疑难解决方法(0)

我需要从web /文件加载一些UIImages.我正在搜索,我在其他问题中找到了这段代码:

    if (![[NSFileManager defaultManager] fileExistsAtPath:user.image]) {
        dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,  0ul);
        dispatch_async(queue, ^{
            NSData *imageData =[NSData dataWithContentsOfURL:[NSURL URLWithString:user.imageURL]];

            [imageData writeToFile:user.image atomically:YES];
            dispatch_sync(dispatch_get_main_queue(), ^{
                UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
                UIImage *image = [UIImage imageWithData:imageData];
                [self.imageFriends setObject:image forKey:[NSNumber numberWithInt:user.userId]];
                cell.imageView.image = image;
                [cell setNeedsLayout];
                NSLog(@"Download %@",user.image);
            });
        });
        cell.imageView.image=[UIImage imageNamed:@"xger86x.jpg"];
    } else {
        NSLog(@"cache");
        dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,  0ul);
        dispatch_async(queue, ^{
            UIImage *image = [UIImage imageWithContentsOfFile:user.image];
            //[self.imageFriends setObject:image forKey:[NSNumber numberWithInt:user.userId]];
            dispatch_sync(dispatch_get_main_queue(), ^{
                UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
                newCell.imageView.image=image;
                [newCell …