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)

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。

自我。标题= "" 之前self.navigationController ?。pushViewController(vc, animated: true)。

Swift 4 -在按任何视图控制器之前配置后退按钮

// if you want to remove the text
navigationItem.backBarButtonItem = UIBarButtonItem()

// if you want to modify the text to "back"
navigationItem.backBarButtonItem = UIBarButtonItem(title: "back", style: .plain, target: nil, action: nil)

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

back按钮属于前一个视图控制器，而不是当前显示在屏幕上的那个。 要修改返回按钮，你应该在按之前更新它，在启动segue的视图控制器上:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let backItem = UIBarButtonItem()
    backItem.title = "Something Else"
    navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed
}

Swift 3,4和5:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let backItem = UIBarButtonItem()
    backItem.title = "Something Else"
    navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed
}

OR

// in your viewDidLoad or viewWillAppear
navigationItem.backBarButtonItem = UIBarButtonItem(
    title: "Something Else", style: .plain, target: nil, action: nil)