iPhone table 實現動態載入圖片的教程

iPhone在載入列表時，如果每個等待把所有列表中的資料都載入完在顯示相關內容，如果列表中有一些比較大的圖片，載入的時間比較長，那麼給使用者的效果就很差了，下面詳細是一種實現動態載入圖片的辦法：- (UITableViewCell *)tableView:(UITableView *)tableView         cellForRowAtIndexPath:(NSIndexPath *)indexPath {    UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"tag"];    if (cell==nil) {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle                                       reuseIdentifier:@"tag"] autorelease];    }       //表格設計    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;}