@interface ViewController (){    UIActivityIndicatorView *testActivityIndicator;}

-(void) showWaitStatus{    NSLog(@"wait...");    testActivityIndicator =            [[UIActivityIndicatorView alloc]            initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];        CGRect rect = self.view.frame;    testActivityIndicator.center = CGPointMake(rect.size.width / 2, rect.size.height / 2);    [self.view addSubview:testActivityIndicator];    testActivityIndicator.color = [UIColor redColor]; // iOS5 引入指定颜色    [testActivityIndicator startAnimating];           // 开始旋转    [testActivityIndicator setHidesWhenStopped:YES];  // 当旋转结束时隐藏}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    [self showWaitStatus];}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    [testActivityIndicator stopAnimating];}