作为标题,我想在UIAlertView实例的中心添加一个UIActivityIndicatorView实例。这是我的代码:
alertView = [[UIAlertView alloc]initWithTitle:@"Processing" message:@"" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil, nil];
CGRect screenRect = [[UIScreen mainScreen] bounds];
indicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(screenRect.size.width/2, screenRect.size.height/2,50,50)];
[alertView addSubview: indicator];
[indicator startAnimating];
[alertView show];
我看到的只是alertView。我犯了什么错误吗?
答案 0 :(得分:11)
在警报视图框架中设置x和y位置时,您忘记考虑指标的宽度和高度。
indicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(roundf((screenRect.size.width - 50) / 2), roundf((screenRect.size.height - 50) / 2),50,50)];
编辑:这是我通常使用的一个:(不要忘记发布内容等)
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Loading..." message: nil delegate:self cancelButtonTitle: nil otherButtonTitles: nil];
UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame: CGRectMake(125, 50, 30, 30)];
progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
[alert addSubview: progress];
[progress startAnimating];
[alert show];
答案 1 :(得分:3)
WORKS IOS 7 +
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Loading data" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles: nil];
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[indicator startAnimating];
[alertView setValue:indicator forKey:@"accessoryView"];
[alertView show];
和解雇
[alertView dismissWithClickedButtonIndex:0 animated:YES];
答案 2 :(得分:0)
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Loading..." message: nil delegate:self cancelButtonTitle: nil otherButtonTitles: nil];
UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame: CGRectMake(125, 50, 30, 30)];
progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
[alert addSubview: progress];
[progress startAnimating];
[alert show];