swift - 带有两个 UIBarButtons 的 NavigationBar 标题

Question

我正在尝试设置 UINavigationBar 的标题。如果我不添加 UIBarButtons，我可以看到标题，如果我添加它们，我不能。我两个都想看

var cancelBarButtonItem = UIBarButtonItem(
    title: "Cancel".localized,
    style: .plain,
    target: self,
    action: #selector(cancelButtonTouched(sender:))
)
var doneBarButtonItem = UIBarButtonItem(
    title: "Done",
    style: .plain,
    target: self,
    action: #selector(doneButtonTouched(sender:))
)

override func viewDidLoad() {
    super.viewDidLoad()

    setupRightNavBarButtons()
    self.navigationController?.navigationBar.topItem?.title = "Title"
}

func setupRightNavBarButtons(){
    self.doneBarButtonItem.isEnabled = false

    navigationItem.leftBarButtonItem = cancelBarButtonItem
    navigationItem.rightBarButtonItem = doneBarButtonItem
}

Answer 1

View Controller 为导航栏设置自己的正确方法是设置自己的 navigationItem。

改变:

self.navigationController?.navigationBar.topItem?.title = "Title"

到:

self.title = "Title" // sets the navigationItem title

或:

navigationItem.title = "Title"