九.忙碌指示器

    UIActivityIndicator。

   UIActivityIndicatorView *activityIndicatior = ［UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge]; 

     activityIndicator.center = CGPointMake(512, 384); 

     [self.view addSubview: activityIndicator]; 

     [activityIndicator startAnimating];  

     [activityIndicator stopAnimating]; 

    [activityIndicator removeFromSuperView];