iPhone活动指示灯

Question

如何在登录页面加载UIActivityIndicatorView？就像Facebook的iPhone应用程序。

Answer 1

activityIndicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    activityIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0); 
    activityIndicator.center = self.view.center; 
    [self.view addSubview: activityIndicator]; 

使用[activityIndicator startAnimating];时要动画

Answer 2

初始化这样的..

UIActivityIndicatorView *activityView = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge] autorelease]; 
activityView.center = CGPointMake(240,160); 
activityView.hidden = true; 
[self.view addSubview: activityView]; 

时要动画

activityView.hidden = FALSE; 
    [activityView startAnimating] ; 

时要停止

[activityView stopAnimating]; 
    activityView.hidden = TRUE; 

编辑：看到评论

没有什么特别之处的Facebook活动indicator.They只是清除有查看随着显示当活动指示灯开始动画..

你只需要创建一个视图，说ActivityView后，它覆盖了屏幕（或任何想要变白的部分），为视图添加白色背景，并将活动指示器添加到视图中。首先隐藏此视图，并且当您想要显示活动指示器时，取消隐藏视图和启动活动指示器动画。在活动指示器中写入两个成员函数来启动和停止动画，以便您可以控制动画fr om anywhere ..

Answer 3

你的问题不清楚。但这是添加活动指示器的方式。

UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(225, 115, 30, 30)]; 
[activity setBackgroundColor:[UIColor clearColor]]; 
[activity setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray]; 
[self.view addSubview:activity]; 
[activity release]; 

启动动画活动

[activity startAnimating]; 

停止动画活动

[activity stopAnimating]; 

Answer 4

CGRect frame = CGRectMake(self.view.frame.size.width/2-15, self.view.frame.size.height/2-15, 37, 37); 
    UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithFrame:frame]; 
    [indicator startAnimating]; 
    indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge; 
    [indicator sizeToFit]; 
    indicator.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | 
            UIViewAutoresizingFlexibleRightMargin | 
            UIViewAutoresizingFlexibleTopMargin | 
            UIViewAutoresizingFlexibleBottomMargin); 

    indicator.tag = 1; 
    [self.view addSubview:indicator]; 
    [indicator release];