UIActivityIndicatorView的两种形式用法一：只显示不停旋转的进度滚轮指示器。

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本文介绍了UIActivityIndicatorView的两种使用方式：一种仅显示旋转的进度指示器，另一种则在显示进度指示器的同时提供半透明背景及加载提示。通过具体的代码示例展示了如何实现这两种效果。

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UIActivityIndicatorView的两种形式
用法一：只显示不停旋转的进度滚轮指示器。
//显示进度滚轮指示器
-(void)showWaiting {
  progressInd=[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:
  UIActivityIndicatorViewStyleWhiteLarge];
  progressInd.center=CGPointMake(self.view.center.x,240);
  [self.navigationController.view addSubview:progressInd];
  [progressInd startAnimating];
}
//消除滚动轮指示器
-(void)hideWaiting
{
   [progressInd stopAnimating];
}
用法二：带有半透明背景的进度轮指示器。
//显示进度滚轮指示器
-(void)showWaiting:(UIView *)parent {
    int width = 32, height = 32;
   CGRect frame = CGRectMake(100, 200, 110, 70)；//[parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    int y = frame.size.height;

    frame = CGRectMake((x - width) / 2, (y - height) / 2, width, height);
   UIActivityIndicatorView* progressInd = [[UIActivityIndicatorView alloc]initWithFrame:frame];
   [progressInd startAnimating];
   progressInd.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;

   frame = CGRectMake((x - 70)/2, (y - height) / 2 + height, 80, 20);
   UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];
   waitingLable.text = @"Loading...";
   waitingLable.textColor = [UIColor whiteColor];
   waitingLable.font = [UIFont systemFontOfSize:15];
   waitingLable.backgroundColor = [UIColor clearColor];

    frame =  CGRectMake(100, 200, 110, 70) ;//[parent frame];
    UIView *theView = [[UIView alloc] initWithFrame:frame];
   theView.backgroundColor = [UIColor blackColor];
    theView.alpha = 0.7;

    [theView addSubview:progressInd];
   [theView addSubview:waitingLable];

   [progressInd release];
   [waitingLable release];

    [theView setTag:9999];
    [parent addSubview:theView];
    [theView release];
}
//消除滚动轮指示器
-(void)hideWaiting
{
   [[self.view viewWithTag:9999] removeFromSuperview];
}