Swift 如何只保留带有大标题的第一页？

Question

The large title of navigation item comes out when the app just describes execution. However, when I move to another page and come back, that mode is turned off. Create a viewDidLoad for each page as follows: What's the problem?

class CollectionViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    
    navigationController?.navigationBar.prefersLargeTitles = true
    self.navigationItem.largeTitleDisplayMode = .always
}

next page

class AssetCollectionViewController: UIViewController {
override func viewDidLoad() {
    super.viewDidLoad()
    
    self.navigationItem.largeTitleDisplayMode = .never
}

Possibly adding code didn't work.

    override func viewDidDisappear(_ animated: Bool) {
    
    self.navigationItem.largeTitleDisplayMode = .always
}

Answer 1

Change titleDisplay mode in viewWillppear function as it will always execute

class CollectionViewController: UIViewController {

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)    
        navigationController?.navigationBar.prefersLargeTitles = true
        self.navigationItem.largeTitleDisplayMode = .always
    }

Answer 2

How about doing all the implementation in your CollectionViewController like so:

override func viewWillDisappear(_ animated: Bool) {
    navigationController?.navigationBar.prefersLargeTitles = false

}

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

Answer 3

When you're setting navigationItem.largeTitleDisplayMode in viewDidDisappear(_:) , you're doing it for the current controller's navigationItem .

I suggest you to create UINavigationController subclass with:

override func viewDidLoad() {
    super.viewDidLoad()
    
    navigationBar.prefersLargeTitles = true
}

Then set navigationItem.largeTitleDisplayMode to .never in controllers, where you don't want large title.