Hide iOS NavigationBar on one ViewController - weird animation happening

Question

I have a standard UINavigationController for an iOS application in Swift 5 in which I'd like to hide the Navigation Bar on the first ViewController in the stack.

My storyboard is essentially:

UINavigationController -> ViewControllerA -> ViewControllerB

with simple Show segues.

In ViewControllerA I put the following:

override func viewWillAppear(_ animated: Bool) {
  super.viewWillAppear(animated)
  self.navigationController?.navigationBar.isHidden = true
}

In ViewControllerB I put the following:

override func viewWillAppear(_ animated: Bool) {
  super.viewWillAppear(animated)
  self.navigationController?.navigationBar.isHidden = false
}

But in the simulator the transition from A->B presents this weird, like, "scooping" animation and I cannot figure out how to get rid of it.

Thoughts? Thank you in advance!

Answer 1

还有另一种隐藏导航栏的方法，您可以在其中将 'animated' 设置为 false，这可能会对您有所帮助。

self.navigationController?.setNavigationBarHidden(true, animated: false)