创建没有按钮的UIAlertView

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by Elton on 2010年02月11日, under iPhone

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：

UIAlertView *alert;
…
alert = [[[UIAlertView alloc] initWithTitle:@"Configuring Preferences\nPlease Wait…"
message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
[alert show];

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：

UIAlertView *alert;
…
alert = [[[UIAlertView alloc] initWithTitle:@"\n\nConfiguring Preferences\nPlease Wait…"
message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil] autorelease];
[alert show];

如果你还想给UIAlertView添加一个等待提示符，则可以这么做：

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