iOS

1、UIActivityIndicatorView

HUD 指示器

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

    //暂停时隐藏

    indicatorView.hidesWhenStopped = YES;

    indicatorView.center = self.view.center;    

    //设置风火轮的颜色

    indicatorView.color = [UIColor redColor];    

- (IBAction)startActity:(id)sender {   

//开始动画

    [self.indicatorView startAnimating];

}

- (IBAction)stopActity:(id)sender {    

//结束动画

    [self.indicatorView stopAnimating];

}