ios - 使用自定义后退按钮后导航标题消失

Question

我有3页

• Page 1: Menu
• Page 2: Menu > Navigation Controller > Map listview
• Page 3: Menu > Navigation Controller > Map

可以在第 2 页和第 3 页之间切换，但是当您单击“后退”时，它总是转到第 1 页，我使用自定义后退按钮完成了此操作。

使用自定义后退按钮后出现如下问题: 当我从菜单页面(第 1 页)转到第 2 或 3 页时，导航标题出现，不到一秒钟它就消失了。这怎么可能？

这些是我正在使用的函数:

private func hideAndAddNewBackButton(){
    if backToRoot{
        self.navigationItem.hidesBackButton = true
        let newBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.Plain, target: self, action: "back:")
        self.navigationItem.leftBarButtonItem = newBackButton;
        self.title = "Locaties"
    }
}

func back(sender: UIBarButtonItem) {
    if let viewController2 = storyboard!.instantiateViewControllerWithIdentifier("ViewController2") as? ViewController2{
        self.navigationController?.pushViewController(viewController2, animated: true);
    }
}

func needBackToRoot(){
    backToRoot = true;
}

这是在我的 viewDidLoad() 中:

var backToRoot:Bool = false;

override func viewDidLoad() {
    super.viewDidLoad()
    self.hideAndAddNewBackButton();
}

我的开关按钮:

@IBAction func showLijst(sender: AnyObject) {
    if let viewController3 = storyboard!.instantiateViewControllerWithIdentifier("Lijst") as? KaartListview{
        viewController3.needBackToRoot();
        self.navigationController?.pushViewController(viewController3, animated: true);
    }
}

Answer 1

在我的案例中，问题是创建自定义后退按钮并在推送 Controller 中进行设置 self.navigationController?.navigationBar.topItem?.title = "" 我的解决方案是:

override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.isNavigationBarHidden = false
          self.navigationController?.navigationBar.topItem?.title = "SomeTitle"

    }