隐藏后，Swift无法显示后退按钮 [英] Swift can't show back button after hiding it

问题描述

我有一个带静态单元格的UITableViewController，它有一个自定义后退按钮。我使用代码隐藏了viewDidLoad中的后退按钮：

  var cancelBtn = UIBarButtonItem（标题：取消，样式：UIBarButtonItemStyle。 Plain，target：self，action：closeSettings）
 self.navigationItem.hidesBackButton = true 
 self.navigationItem.leftBarButtonItem = cancelBtn 
  

如果我没有self.navigationItem.hidesBackButton = true行，则仍会显示后退按钮箭头。在代码中使用该行，后退按钮被隐藏，取消按钮正好显示我想要的方式。当我从单元格打开另一个视图控制器时，问题就出现了，后退按钮不存在。单击单元格时，我实例化视图控制器，并使用导航控制器推送视图控制器。我试图把

  self.navigationItem.hidesBackButton = false 
   
 
 
。当我这样做时，我看到后退按钮出现，但是当导航控制器上按下新的视图控制器时，后退按钮消失。
 
 
 
我甚至试图将目标View Controller的viewDidLoad和viewDidAppear中的hidesBackButton = false行，但我无法显示后退按钮。任何人都可以帮我引导我朝着正确的方向前进吗？ 
解决方案
您是否尝试过设置 self.navigationItem.hidesBackButton = false  at  viewWillDisappear（）？
 
I have a UITableViewController with static cell that has a custom back button. I hide the back button in viewDidLoad with the code:
var cancelBtn = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "closeSettings")
self.navigationItem.hidesBackButton = true
self.navigationItem.leftBarButtonItem = cancelBtn
If I don't have the self.navigationItem.hidesBackButton = true line in place, the back button arrow still appears. With that line in the code, the back button is hidden and the Cancel button appears exactly how I want. The problem is coming when I open another view controller from a cell, the back button is not present. I instantiate the view controller when a cell is clicked, and use the Navigation Controller to push the View Controller. I have attempted to put
self.navigationItem.hidesBackButton = false
in the code right before pushViewController(). When I do that I see the back button appear, but when the new View Controller is pushed on the Navigation Controller, the back button disappears.

I have even attempted putting the hidesBackButton = false line in the target View Controller's viewDidLoad and viewDidAppear, but I was not able to get the back button to appear. Could anyone help steer me in the right direction on what I could be doing wrong? 
解决方案
Did you try setting  self.navigationItem.hidesBackButton = false at viewWillDisappear()?

                        
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