Question

我正在尝试异步加载Web内容。一旦调用connectionDidFinishLoading方法，我不确定如何更新视图控制器中的标签/其他内容。在下面的示例中，我只是尝试更新标签以显示内容已加载。我该怎么做？谢谢！

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"Succeeded! Received %d bytes of data",[responseData
                                                   length]);
    NSString *txt = [[NSString alloc] initWithData:responseData encoding: 
    NSASCIIStringEncoding];

    label.text = @"DISPLAY THIS WHEN FINISHED";  
}

我被告知让我的viewController成为NSURLConnectionDelegate，然后从viewDidLoad运行fetchData方法，然后在connectionDidFinishLoading中获取数据时使用您获取数据的数据。谁知道从哪里开始？谢谢！

Answer 1

正如Ramy正确指出的那样，你必须在主线程上更新你的UI，然后：

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
   NSLog(@"Succeeded! Received %d bytes of data",[responseData length]);
   NSString *txt = [[NSString alloc] initWithData:responseData 
                                         encoding: NSASCIIStringEncoding];

  NSString *text = @"DISPLAY THIS WHEN FINISHED";
  [label performSelectorOnMainThread:@selector(setText:) withObject:text waitUntilDone:NO]
}

调用connectionDidFinishLoading后更新视图控制器

1 个答案: