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];