IOS9之后，如何通过URL从网络上下载数据，具体方法？

-(void)downloadWithUrl:(NSURL *)url compelet:(DownLoadBlock)block {
//保存block
self.block = block;
//创建队列
dispatch_queue_t queue = dispatch_queue_create(nil, DISPATCH_QUEUE_CONCURRENT);
dispatch_async(queue, ^{
    //执行下载任务
    //创建请求
    NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];
    //获取数据
    NSData *date = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
//将数据返回给调用者
    dispatch_sync(dispatch_get_main_queue(), ^{

        self.block(date);


    });

});
}

获取数据的方法好像是ios9.0之后就不能用了，现在怎么获取，