NavigationBar delay updating barTintColor iOS10

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Try this code:

Note: Code Tested in Swift 3.

In ViewController A:

    override var isViewLoaded: Bool {
    title = "View 1"
    navigationController?.navigationBar.barTintColor = .blue
    navigationController?.navigationBar.isTranslucent = true
    navigationController?.navigationBar.tintColor = UIColor.white
    navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white]
    UIApplication.shared.statusBarStyle = .lightContent
    self.navigationController?.navigationBar.barStyle = .black // In case statusbar Light content wont work.
    return true
    }

In ViewController B:

    override var isViewLoaded: Bool {
    title = "View 2"
    navigationController?.navigationBar.barTintColor = .green
    navigationController?.navigationBar.tintColor = .white
    navigationController?.navigationBar.isTranslucent = true
    navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white]
    return true
    }

Output: No delay what so ever…

enter image description here

Pattern Image as a TintColor.

In ViewController A:

 navigationController?.navigationBar.barTintColor = UIColor(patternImage: UIImage(named: "viewOneImage.jpg")!)

In ViewController B:

 navigationController?.navigationBar.barTintColor = UIColor(patternImage: UIImage(named: "viewTwoImage.jpg")!)

Output:

enter image description here

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