iOS颜色过渡导航栏

Question

My main Navigation Bar Color is a dark red. But when I fullsize view a picture, I want to have a black one. But it looks as the following:

Anybody knows why the transition isn't very smooth?

I set the color in the fullsize-image view controller in the viewWillAppear Method, and revert it to the red color in the viewWillDisappear Method.

Hope you can help me.

Answer 1

It is cross-fading your navigation bar because this is the only allowed animation for navigation bars. I don't think there's any other way to make it do a gradient.

Answer 2

Please, use this:

override func willMove(toParent parent: UIViewController?) {
    self.navigationController?.navigationBar.barTintColor = .red

}

Answer 3

This happens when you give give navigation bar color as clear color i guess but you can overcome this by declaring it in Appdelegate file so that it can be applied in all ViewControllers like below,

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
UINavigationBar.appearance.barTintColor = UIColor.red
UINavigationBar.appearance.tintColor = UIColor.white
UINavigationBar.appearance.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.white]

return true
}

i hope it helps you out.good luck.