How to add subview inside UIAlertView for iOS 7?

Question

I am having an application on iTunes store which displays some UILabel and UIWebView on UIAlertView. According to session video,

Answer 1

A solution is to subclass UIAlertView and detect the "_UIModalItemAlertContentView" view. My AlertView had a UITextField, so I used it to detect the content view :

- (void)show
{
    [ super show ];
    UIView *contentView=nil;
    if([[[UIDevice currentDevice] systemVersion] floatValue ] < 7.0f)
    {
        contentView=self;
    } else {
        UIView *rootView=[self textFieldAtIndex:0];
        while((rootView=[rootView superview])!=nil)
        {
            if([ NSStringFromClass([rootView class]) isEqualToString:@"_UIModalItemAlertContentView"])
            {
                contentView=rootView;
                break;
            }
        }
    }

    if(contentView!=nil)
    {
        [ contentView addSubview: ... ];
    }
}