iphone 提示(弹出)框的使用

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:@"此用户不存在" delegate:self cancelButtonTitle:@"关闭" otherButtonTitles:nil];

[alertView setTag: 10000];

[alertView show];

[alertView release];

//点击关闭的时候响应的函数

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {

    if ([alertView tag] == 10000) {    // it's the Error alert

        if (buttonIndex == 0) {     // and they clicked OK.

           

        }

    }

}