Useful modal UIViewController extensions.

UIViewController+Modal.swift

import Foundation
import UIKit

extension UIViewController {

	/// Whether the view is currently displayed in modal style.
	var isModal: Bool {
		return self.presentingViewController?.presentedViewController == self
			|| self.navigationController?.presentingViewController?.presentedViewController == self.navigationController
			|| self.tabBarController?.presentingViewController?.isKindOfClass(UITabBarController) == true
	}

	/// Whether the view has the same frame as the window.
	/// Use this to test whether a modal fills the screen.
	var hasSameFrameAsWindow: Bool {
		let frame = self.view.frame
		let frameInWindow = self.view.window!.convertRect(frame, fromView: self.view)
		return frame == frameInWindow
	}

}