ios - 通过导航 Controller 继续

Question

所以我在 [2] 中有一个按钮，它通过导航 Controller 推送到 [3]，这样我就可以使用工具栏中的“后退”按钮返回到 [2]。这一切都很好。

在 [4] 中我也有一个按钮，我希望它转到 [3]。但它也应该通过导航 Controller ，这样当我按下“返回”时，我可以再次返回到 [2]。

所以实际上我希望 [4] 上的按钮像 [ 1 ][ 2 ][ 3 ] 这样我就可以从 [3] 返回到 [2]

@IBAction func showKaart(sender: AnyObject) {
 performSegueWithIdentifier("menuToKaart", sender: sender)
}

Answer 1

如果我理解你的问题，我相信试试吧。

请注意您的 Root View Controller 是 vc[2]，好吗？ 您从 vc[2] > vc[3] 推送，然后按返回并返回到 vc[2]，没关系! 您从 vc[4] > vc[3] 推送，然后按返回并返回到 vc[4]，但您需要返回到vc[2]？

对于此逻辑，您可以为 vc[3] 创建自定义行为

对于你的 vc[3] 我这样做是为了控制行为。

class ViewController3:UIViewController{

    var backToRoot:Bool = false;

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

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

    func back(sender: UIBarButtonItem) {
        if backToRoot{
            self.navigationController?.popToRootViewControllerAnimated(true);
        }else{
            self.navigationController?.popViewControllerAnimated(true)
        }
    }

    func needBackToRoot(){
        backToRoot = true;
    }
}

现在在 vc[4] 中，我认为您可以修改 vc[3] 的后退按钮行为 我介意用两种方式处理你的 vc[4]

首先使用 performSegue。

class ViewController4PerfomSegue:UIViewController{

    @IBAction func pressButtonToPushViewController3(sender:AnyObject?){
        self.performSegueWithIdentifier("showViewController3", sender: nil);
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if let viewController3 = segue.destinationViewController as? ViewController3{
            viewController3.needBackToRoot();
        }
    }

}

其次在导航 View Controller 中使用推送手册

class ViewController4Push:UIViewController{

    @IBAction func pressButtonToPushViewController3(sender:AnyObject?){
        let viewController3 = ViewController3(nibName: "ViewController3", bundle: nil);
        viewController3.needBackToRoot();
        self.navigationController?.pushViewController(viewController3, animated: true);
    }
}

编辑:从 Storyboard实例化的新方法

class ViewController4Push:UIViewController{

    @IBAction func pressButtonToPushViewController3(sender:AnyObject?){
        if let viewController3 = storyboard!.instantiateViewControllerWithIdentifier("ViewController3") as? ViewController3{
            viewController3.needBackToRoot();
            self.navigationController?.pushViewController(viewController3, animated: true);
        }
    }
}

编辑:在呈现新 View 时删除

class ViewController4Push:UIViewController, UINavigationControllerDelegate{

    @IBAction func pressButtonToPushViewController3(sender:AnyObject?){
        if let viewController3 = storyboard!.instantiateViewControllerWithIdentifier("ViewController3") as? ViewController3{
            viewController3.needBackToRoot();
            self.navigationController?.delegate = self;
            self.navigationController?.pushViewController(viewController3, animated: true);
        }
    }

    func navigationController(navigationController: UINavigationController, didShowViewController viewController: UIViewController, animated: Bool) {
        self.navigationController?.delegate = nil;
        self.dismissViewControllerAnimated(false, completion: nil);
        //or self.removeFromParentViewController();
    }
}

如果我理解了问题，希望对你有帮助

编辑:和思南聊天后我们用简单的方法解决了，强制返回应用的根元素即可

class ViewCustomController:UIViewController{

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

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

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