CGAffineTransformTranslate 在 iOS 3.1.3 中不起作用

Question

我正在尝试将 UIAlertView 从屏幕中心的默认位置移动到顶部。我使用下面的代码，它可以在 iOS 4 上运行，但不能在 3 上运行。
有人有什么想法吗？

UIAlertView *newSubscriptionAlertView = [[UIAlertView alloc] initWithTitle:@"Ndrysho abonimin" message:@" " delegate:self cancelButtonTitle:@"Anullo" otherButtonTitles:@"Ruaj", nil];
    subscriptionNameField = [[UITextField alloc] initWithFrame:CGRectMake(12.0, 45.0, 260.0, 22.0)];
    subscriptionNameField.text = [[subscriptions objectAtIndex:changeCode] title];
    subscriptionNameField.autocorrectionType = UITextAutocorrectionTypeNo;
    subscriptionNameField.autocapitalizationType = UITextAutocapitalizationTypeNone;
    [subscriptionNameField setBackgroundColor:[UIColor whiteColor]];
    [newSubscriptionAlertView addSubview:subscriptionNameField];
    [subscriptionNameField becomeFirstResponder];
    [subscriptionNameField release];
    CGAffineTransform moveUp = CGAffineTransformTranslate(newSubscriptionAlertView.transform, 0.0, 0.0);
    [newSubscriptionAlertView setTransform:moveUp];
    [newSubscriptionAlertView show];
    [newSubscriptionAlertView release];

Answer 1

解决方案是这样的：

if (!([[[UIDevice currentDevice] systemVersion] floatValue] > 4.0)) {
//This is for iOS versions below 4.0
        changeFolderAlertView.transform = CGAffineTransformMakeTranslation(0.0f, 70.0f);
    } else {
//This is for iOS4.0+
        changeFolderAlertView.transform = CGAffineTransformMakeTranslation(0.0f, 0.0f);
    }