UIActivityIndicatorView的两种形式

最新推荐文章于 2018-08-02 22:06:00 发布

转载最新推荐文章于 2018-08-02 22:06:00 发布 · 567 阅读

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本文介绍如何在iOS应用中使用UIActivityIndicatorView显示和隐藏进度滚轮指示器，包括基本用法和带有半透明背景的高级用法。

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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]; //[[UIScreenmainScreen] 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];
[progressIndstartAnimating];
   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) ;//[parentframe];
  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.viewviewWithTag:9999]removeFromSuperview];
}