在iPhone应用程序中等待光标

Question

是否有一种简单的方法在iPhone sdk中显示等待动画。我有一个屏幕，需要几秒钟才能加载，我想给用户一些反馈，指出发生了什么。有什么建议么？

Answer 1

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES]; 

或

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; 

会做的伎俩！

编辑：发现这是在旧的项目，客户要求有更好的能见度的指标：

-(void)invokeMegaAnnoyingPopup 
{ 
    self.megaAlert = [[[UIAlertView alloc] initWithTitle:@"Please wait..." 
     message:nil delegate:self cancelButtonTitle:nil 
     otherButtonTitles: nil] autorelease]; 

    [self.megaAlert show]; 

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

    indicator.center = CGPointMake(self.megaAlert.bounds.size.width/2, 
            self.megaAlert.bounds.size.height - 45); 
    [indicator startAnimating]; 
    [self.megaAlert addSubview:indicator]; 
    [indicator release]; 
} 

-(void)dismissMegaAnnoyingPopup 
{ 
    [self.megaAlert dismissWithClickedButtonIndex:0 animated:YES]; 
    self.megaAlert = nil; 
} 

当然，你需要在你的类中定义的UIAlertView *megaAlert;。