Programmatically get height of navigation bar

Do something like this ?

    NSLog(@"Navframe Height=%f",
        self.navigationController.navigationBar.frame.size.height);

The swift version is located here

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UPDATE

iOS 13

As the statusBarFrame was deprecated in iOS13 you can use this:

extension UIViewController {

    /**
     *  Height of status bar + navigation bar (if navigation bar exist)
     */

    var topbarHeight: CGFloat {
        return (view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0.0) +
            (self.navigationController?.navigationBar.frame.height ?? 0.0)
    }
}