How to the grab the highest level Superview in iPhone App?

I want to be able to grab the main UIView for the application. So far, I have been calling [[[self.view superview] superview] superview] to traverse up the chain (or down, depending on how you look at it). The problem with this is that it is possible that I can't be absolutely sure the number of levels up开发者_JAVA百科 I need to go. Is there a way to:

1. Go directly to the highest level UIView in an iPhone application?

or, if not,

1. Check to see if the current superview is the highest level UIView in the app?

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I'm not sure that it's what your are looking for in the first place, but it can help.

If you are trying to find the top view in order to add a subview, like say a popup or other, you can use UIWindow, which is in some way, the top level view:

UIWindow* window = [UIApplication sharedApplication].keyWindow;
if (!window) {
    window = [[UIApplication sharedApplication].windows objectAtIndex:0];
}
[window addSubview:yourView];

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Just pulling this off the top, something like checking if the superview property of the current view is null? If it is I guess we may presume that it is the root view.