UIAlertView 添加UITextField UIActivityIndicatorView

alertview = [[UIAlertView alloc]
                            initWithTitle:NSLocalizedString(@"请输入验证码", nil)
                            message:@"\n\n\n\n"
                            delegate:self
                            cancelButtonTitle:@"取消"
                            otherButtonTitles:@"确定",
                            nil];
            
            activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
            activityIndicator.frame = CGRectMake(120, 50, 30, 30);
            [alertview addSubview:activityIndicator];
            [activityIndicator startAnimating];
            
            UITextField *verifycode = [[UITextField alloc] initWithFrame:CGRectMake(12, 95, 260, 30)];
            CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0, 60);
            [alertview setTransform:myTransform];
            [verifycode setBackgroundColor:[UIColor whiteColor]];
            [alertview addSubview:verifycode];
            [alertview show];
            [alertview release];
            [verifycode release];