iphone table 实现动态加载图片

- (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;
}