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I have a view that is UIViewController (root) that handles ads and a UINavigationController. In that UINavigationController I have typical layers of controllers. In my custom settings table view controller, I have a button to contact me for support. When the user clicks this button I create a MFMailComposeViewController and would like to present it. I can't present it from the settings table view as it will be underneath my ads, so I need to reference the root view and present it from there. I've tried self.parentViewController.parentViewController where self is the settings table view, but that doesn't work. How should I reference this. It seems like a bad design to have to reference the root view directly and pass it to the settings view.
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The root view controller is simply the view controller that sits at the bottom of the navigation stack. You can access the navigation controller's array of view controllers through its viewControllers property. To access the root view controller, we ask for the first item of the array of view controllers.
The root view controller provides the content view of the window. Assigning a view controller to this property (either programmatically or using Interface Builder) installs the view controller's view as the content view of the window.
Both are used for different purpose. A UIViewController class manages a ViewContoller which is responsible for actions that happen within that View controller. This class is aware of actions that happen on view controller, like ViewDidLoad, ViewWillApper, ViewDidAppear, ViewWillDisapper, ViewDidDisapper.
Get the current keyWindow:
UIWindow *window = [UIApplication sharedApplication].keyWindow; Get its rootViewController:
UIViewController *rootViewController = window.rootViewController; NOTE: If an UIAlertView is currently being shown, a new window is being created and assigned to be the keyWindow. There might be other exceptional cases as well that will not keep your application window to be the keyWindow.
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