iPhone table 实现动态加载图片的教程

iPhone table 实现动态加载图片的教程

iPhone在加载列表时，如果每个等待把所有列表中的数据都加载完在显示相关内容，如果列表中有一些比较大的图片，加载的时间比较长，那么给用户的效果就很差了，下面详细是一种实现动态加载图片的办法：

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"tag"]; 
    if (cell==nil) { 
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle 
                                       reuseIdentifier:@"tag"] autorelease]; 
    }    
    //表格设计 
    NSDictionary* one = [array objectAtIndex:indexPath.row]; 
    cell.textLabel.text = [one objectForKey:@"title"]; 
    cell.detailTextLabel.text = [one objectForKey:@"content"]; 
     [NSThread detachNewThreadSelector:@selector(updateImageForCellAtIndexPath:) toTarget:self withObject:indexPath]; 
    return cell; 
}
- (void)updateImageForCellAtIndexPath:(NSIndexPath *)indexPath 
{ 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
    UIImage *image = [self getImageForCellAtIndexPath:indexPath]; 
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath]; 
    [cell.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO]; 
    [image release]; 
    [pool release]; 
} 
-(UIImage *)getImageForCellAtIndexPath:(NSIndexPath *)indexPath 
{ 
    id path = [[array objectAtIndex:indexPath.row] objectForKey:@"image"]; 
    NSURL *url = [NSURL URLWithString:path]; 
    NSData *data = [NSData dataWithContentsOfURL:url]; 
    UIImage *image = [[UIImage alloc] initWithData:data cache:NO]; 
    return image; 
}