alert提示框

//alert设置时间自动消失

alert_ = [[UIAlertView alloc] initWithTitle:@"提示" message:message delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];            [alert_ show];            [self performSelector:@selector(alertHide) withObject:nil afterDelay:1.0f];            [self.navigationController popViewControllerAnimated:YES];

<pre name="code" class="objc">-(void)alertHide{    [alert_ dismissWithClickedButtonIndex:[alert_ cancelButtonIndex] animated:YES];}