iOS - 仅为部分自定义导航栏 UIViewController

Question

I have to add new screens to an existing app, that will use a different navigation bar style than the one that already exists and will be accessed from different screens. The idea would be to show the new Navigation Bar style only for those screens, so when the user finishes that flow or goes back to the screen that started the navigation, it should show again the navigation bar style it was previously using.

I have tried 2 things but didn't work as expected:

1. I thought of wrapping the new screens in a new UINavigationController , so I could change its navigation bar style and it would be consistent for the new screens. It works but the problem is that I am not able to customize the initial UINavigationController transition to make it not look like a modal (ie I want to show that UINavigationController with the same animation as if I were pushing a UIViewController ). Is there a way to do that? By the way, I am managing the navigations with storyboards segues.

2. I also thought of using

self.navigationController?.navigationBar.isHidden = true

But doesn't seem clean because I would have to show it again when the flow is finished (it is a bit long) or cancelled. This makes a lot of combinations and it would be easy to miss one of them, so this doesn't seem a practical solution. Is there a better way to do this?

Answer 1

The presenting view controller is where you want to change the nav bar for the controller to be presented. So you'd make any changes to the navbar just before you call push(viewController:animated:) .

And then in viewWillAppear of still the presenting view controller you would reset the navbar to what it was initially.

NOTE: Keep in mind that depending on the kind of changes you're doing to the navbar, the transition might no longer be smooth. The user might see some flickering of sorts on the navbar, which would be poor UI/UX.

Edit: Another alternative

Alternatively, you could get rid of the navbar and instead implement your own header view that you can style however you want, to represent the navbar.

• You can style it as a simple navbar with a title + back button.
• You can style it to look like a navbar with large title
• You can style it as a navbar with back button + background image + title + right bar buttons

As you can see, this second alternative offers you more freedom in what you can do.