如何在 Swift 的 UIView/Utility 类中获取导航栏

Question

Actually I need to get the navigation bar in custom view class. I can get the navigaiton bar height in my view controller class. How do I get the naviagtion bar height in the UIView/Utiity common class? . I have only one view controller and added navigation controller in that class. I want to access that navigation bar height in any of the custom view.

    // works in view controller 
    var navigationBarHeight: CGFloat {
    return UIApplication.shared.statusBarFrame.size.height +
        (self.navigationController?.navigationBar.frame.height ?? 0.0)
}

Answer 1

You can get the height of navigation bar by using following:

guard let rootVC = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController else { return }

let navigationBarHeight = rootVC.navigationBar.frame.height