在导航控制器中设置后退按钮

Question

我似乎无法以编程方式正确设置 navigationController 的后退按钮，以显示前一个视图何时使用

self.navigationController?.pushViewController(newView, animated: true)

我使用循环将前一个视图中的所有视图隐藏在viewDidDisappear 中，并且在 viewDidAppear 中呈现的新视图中，我尝试以各种方式设置后退按钮的操作；但是，虽然我可以成功操作自动显示的后退按钮，例如隐藏它或更改它的图像，但我无法设置它的操作。

任何见解都将不胜感激，因为我发现的答案似乎都没有正常工作。这也是在不使用情节提要的情况下完成的

if let img = UIImage(named: "backButton") {
                self.navigationController?.navigationBar.backIndicatorImage = img
                self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = img
                print("IMAGE")
            }
            topItem.backBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Rewind, target: self,
                                                        action:#selector(self.backButtonAction(_:)))

Answer 1

在您的情况下，在导航上添加一个自定义按钮。

class YourViewController: UIViewController {
//Navigation Items.

//left bar button item.
private var leftBarButtonItem : UIBarButtonItem!

//left button.
private var navigationLeftButton : UIButton!

//Your other variable/object declaration.

  func viewDidLoad() {
    super.viewDidLoad()
    self.leftBarButtonItem = UIBarButtonItem()
  }

  func viewDidAppear(animated: Bool) {
      super.viewDidAppear(animated)

      self.setNavigationBackButton()
  }



  private func setNavigationBackButton() {

    if(self.navigationLeftButton == nil) {
        self.navigationLeftButton = UIButton(type: UIButtonType.System)
    }


    //Styling your navigationLeftButton goes here...

    self.navigationLeftButton.addTarget(self, action: Selector("backButtonTapped"), forControlEvents: UIControlEvents.TouchUpInside)
    self.leftBarButtonItem.customView = self.navigationLeftButton
    self.navigationItem.leftBarButtonItem = self.leftBarButtonItem
  }

  func backButtonTapped(AnyObject:sender) {
   // Here add your custom functionalities.
   // Note, this will not pop to previous viewcontroller,

  }
}