创建没有按钮的UIAlertView

默认的，UIAlertView都有一个或者多个按钮，如果你想创建没有按钮的UIAlertView，可以使用以下的方法：

1.  
2. UIAlertView *alert; 
3. alert = [[[UIAlertView alloc] initWithTitle:@"Configuring Preferences\nPlease Wait…"
4.   message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
5.  
6. [alert show];
7.  

上面的标题可能有些靠上，可以用过给标题增加回车的方式，使标题居中：

1.  
2. UIAlertView *alert; 
3. alert = [[[UIAlertView alloc] initWithTitle:@"\n\nConfiguring Preferences\nPlease Wait…"
4.   message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
5.  
6. [alert show];
7.  

如果你还想给UIAlertView添加一个等待提示符，则可以这么做：

1.  
2. UIAlertView *alert; 
3. alert = [[[UIAlertView alloc] initWithTitle:@"Configuring Preferences\nPlease Wait…" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
4. [alert show];
5.  
6. UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
7.  
8. // Adjust the indicator so it is up a few pixels from the bottom of the alert
9. indicator.center = CGPointMake(alert.bounds.size.width / 2, alert.bounds.size.height – 50);
10. [indicator startAnimating];
11. [alert addSubview:indicator];
12. [indicator release];
13.  

解除UIAlertView的显示

设置定时器[NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(performDismiss) userInfo:nil repeats:NO];

调用如下方法：

- (void)performDismiss {
    [baseAlert dismissWithClickedButtonIndex:0 animated:NO];
}

http://blog.prosight.me/index.php/2010/02/580