旋转轮子 UIActivityIndicatorView

旋转轮子

    *activityView = [[UIActivityIndicatorView alloc ]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];

    activityView.center= CGPointMake(160, 200);

    [activityView startAnimating];

    [activityView hidesWhenStopped];

    [self.window addSubview:activityView];

    [activityView release];

    [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(test:) userInfo:activityView repeats:NO];

    [[UIApplication sharedApplication ]setNetworkActivityIndicatorVisible:YES];//显示在状态栏

    return YES;

}

-(void) test:(NSTimer *)timer

{     [[UIApplication sharedApplication ]setNetworkActivityIndicatorVisible:NO];

    UIActivityIndicatorView *activityView =[timer userInfo];

    [activityView stopAnimating];

}

旋转轮子 UIActivityIndicatorView

原文：http://www.cnblogs.com/meixian/p/5370895.html