Question

We have common views that we use in our application in many locations inside of UINavigationControllers. Occasionally the UINavigationControllers are inside of popover views. Now the views we put into the nav controllers modify their navigation controller’s toolbar buttons and, in some cases, use custom buttons that we’ve created. We need to be able to figure out from the UIViewcontroller itself if the view is inside of a popoverview so we can display the correctly colored buttons.

We can easily get the Navigation controller reference from the UIViewController, using UIViewController.navigationController, but there doesn’t seem to be anything for finding a UIPopoverController.

Does anyone have any good ideas for how to do this?

Thanks!

Answer 1

I was recently looking for a way to determine wether or not a view was being displayed in a popover. This is what I came up with:

    UIView *v=theViewInQuestion;        
    for (;v.superview != nil; v=v.superview) {
        if (!strcmp(object_getClassName(v), "UIPopoverView")) {
            NSLog(@"\n\n\nIM IN A POPOVER!\n\n\n\n");
        }

Basically you climb the view’s superview tree looking to see if any of its superviews is a UIPopoverView. The one caveat here is that the class UIPopoverView is an undocumented private class. I’m relying on the fact that the class name won’t change in the future. YMMV.

In your case:

theViewInQuestion =  theViewControllerInQuestion.view;

I’d be interested to see if anyone else comes up with a better solution.