UIActivityIndicatorView


  [activity setCenter:CGPointMake(160, 140)];//指定进度轮中心点

  [activity setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];//设置进度轮显示类型

  [self.view addSubview:activity];
[activity stopAnimating];//关闭
[activity startAnimating];//开启  ```

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