UIActivityIndicatorView - 加载进度

UIActivityIndicatorView ---- 加载进度

UIActivityIndicatorView可以用于显示某项工作在进行中，比如加载进度。在iphone中应用很广泛

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];}

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