后退按钮文本和彩色文本:

navigationController?.navigationBar.tintColor = .red
navigationController?.navigationBar.topItem?.backButtonTitle = "Hi"

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)

在呈现控制器的viewDidLoad方法中添加:

// hide navigation bar title in the next controller
let backButton = UIBarButtonItem(title: "", style:.Plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backButton

解决方案检查和工作在Swift 5

下面是针对不同情况的一些解决方案:

1. 从后退按钮中删除文本

从后退按钮中删除文本的最佳解决方案是在viewDidLoad()中添加:

navigationItem.backBarButtonItem = UIBarButtonItem()

2. 在返回按钮上设置自己的文本

如果你想设置你自己的标题，可以通过设置backButton的title:

let backButton = UIBarButtonItem()
backButton.title = "My Title"
navigationItem.backBarButtonItem = backItem

3.清空所有VC上的返回按钮

如果你想在整个应用程序中创建通用样式-只有箭头返回而没有文本，为所有的视图控制器创建基础VC:

class BaseViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.backBarButtonItem = UIBarButtonItem()
    }
}

上面给出的解决方案可以让你在将来自定义返回按钮，如果你以后想要做一些例外，通过添加额外的变量并在特定的ViewController中重写它，f.x:

class BaseViewController: UIViewController {

    var customBackButtonTitle: String?

    override func viewDidLoad() {
        super.viewDidLoad()

        var backButton = UIBarButtonItem()
        if let text = customBackButtonTitle {
            backButton.title = text
        }
        navigationItem.backBarButtonItem = backButton
    }
}

斯威夫特4.2

如果你想改变导航栏后退按钮的文本，把它放在控制器的viewDidLoad中，在后退按钮显示之前，而不是在后退按钮可见的视图控制器上。

 let backButton = UIBarButtonItem()
 backButton.title = "New Back Button Text"
 self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton

如果你想改变当前导航栏标题文本，请使用下面的代码(注意，这将成为NEXT视图推到导航控制器上的默认回显文本，但这个默认回显文本可以被上面的代码覆盖)

 self.title = "Navigation Bar Title"

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)