有两种方法。

1.在previousViewController.viewDidLoad()中

let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back"
navigationItem.backBarButtonItem = backBarBtnItem

2.在currentviewcontroller。viewdidappear()中

let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back"      
navigationController?.navigationBar.backItem?.backBarButtonItem = backBarBtnItem

原因:backButton来自navigationBar.backItem。backBarButtonItem，第一种方法很明显。在currentViewController.viewDidLoad()中，我们无法获得backItem的引用，因为在viewDidAppear()中，navigationBar将navigationView推入了它的堆栈。因此我们可以在currentViewController.viewDidAppear()中对backItem进行更改

更多细节，你可以看到文档:UINavigationBar

虽然这些答案解决了问题，但这可能是一些有用的

class MainNavigatioController: UINavigationController {

    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        // first
        let backItem = UIBarButtonItem()
        backItem.title = "رجوع"
        self.viewControllers.last?.navigationItem.backBarButtonItem = backItem
        // then
        super.pushViewController(viewController, animated: animated)

    }

}

override func viewWillAppear(_ animated: Bool) {

    self.tabBarController?.navigationItem.title = "Notes"

    let sendButton = UIBarButtonItem(title: "New", style: .plain, target: self, action: #selector(goToNoteEditorViewController))

    self.tabBarController?.navigationItem.rightBarButtonItem = sendButton
}

func goToNoteEditorViewController(){
   // action what you want
}

希望能有所帮助!!3 #迅速

斯威夫特4

在我的案例中，解决方案是在移动到子视图控制器之前清除主视图控制器的导航项。如果再次显示，请重新设置

MasterController

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    navigationItem.title = "Master Title"
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    navigationItem.title = ""
}

这就是我如何推送一个UIViewController并清除子控制器中的后栏按钮项:

MasterController

let childController = ChildController(collectionViewLayout: UICollectionViewFlowLayout())
childController.navigationItem.backBarButtonItem?.title = ""
navigationController?.pushViewController(childController, animated: true)

这应该可以工作:

override func viewDidLoad() {
    super.viewDidLoad()

    var button = UIBarButtonItem(title: "YourTitle", style: UIBarButtonItemStyle.Bordered, target: self, action: "goBack")
    self.navigationItem.backBarButtonItem = button

}

func goBack()
{
    self.navigationController?.popViewControllerAnimated(true)
}

虽然不建议这样做，因为这实际上取代了backButton，它也删除了后退箭头和滑动手势。

下面的代码可以添加到视图控制器中，从你想要更改返回按钮文本的视图控制器中

斯威夫特5

self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)

例如:-

ViewController1 ViewController2

假设我们想要更新回viewcontroller2的标题，我们从viewcontroller1推送viewcontroller2。

那么您可以使用以下代码:-

let vc2 = storyboard.instantiateViewController(withIdentifier: "ViewController2")
self.navigationItem.backBarButtonItem = UIBarButtonItem(title:  "your custom back button title", style: .plain, target: self, action: nil)
self.navigationController?.pushViewController(vc2, animated: true)