iphone ==> UIAlertView 改变背景？

Question

我正在尝试更改 uialertview 的背景。一切工作正常，除了我添加到 uialert View 的背景图像不会在警报 View 内缩放。所以基本上你只能看到基于当前大小的背景图像的一部分。有什么方法可以使图像在警报 View 内缩放直到适合吗？

UIAlertView *theAlert = [[UIAlertView alloc] initWithTitle:title 
                                                    message:msg
                                                   delegate:nil 
                                          cancelButtonTitle:@"OK" 
                                          otherButtonTitles: nil];
    [theAlert show];

    UIImage *theImage = [UIImage imageNamed:@"bg.jpg"];
    theImage = [theImage stretchableImageWithLeftCapWidth:16 topCapHeight:16];
    CGSize theSize = [theAlert frame].size;

    UIGraphicsBeginImageContext(theSize);
    [theImage drawInRect:CGRectMake(0, 0, theAlert.frame.size.width, theAlert.frame.size.height)];
    theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    theAlert.layer.contents = (id)[theImage CGImage];
    [theAlert release];

Answer 1

请看一下: http://joris.kluivers.nl/iphone-dev/?p=CustomAlert

他们解释了如何通过子类化 UIAlertView 来做到这一点。祝你好运!