iOS 导航后退按钮

Question

我想在我的第二个 View Controller 上有一个后退按钮。现在加载时，它确实显示后退按钮，但我想将标题从“返回”更改为其他内容。我实现了调用显示导航栏的 viewWillAppear 方法。以下无效:

 override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated);
        self.navigationController?.navigationBar.hidden = false
        self.navigationController?.navigationBar.backItem?.title = "Something Else"

    }

请帮我改一下标题。应该在willAppear还是viewDidLoad中？

Answer 1

在您的第一个 View 中的 push 或 popViewController 语句之前添加:

let backButton = UIBarButtonItem(title: "Something Else",style: UIBarButtonItemStyle.Plain ,target: nil,action: nil)
self.navigationController!.navigationBar.topItem!.backBarButtonItem = backButton

或者您可以通过这种方式在您的第二个 View 中执行此操作:

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated);

    let backButton = UIBarButtonItem(title: "Something Else",style: UIBarButtonItemStyle.Plain ,target: nil,action: nil)
    self.navigationController!.navigationBar.topItem!.backBarButtonItem = backButton
}