IOS之tableview 实现动态加载图片

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;

}