Ios 在具有委托的多个UIViewController的队列上使用dismissViewController

当我的应用程序第一次启动时，我正在演示4 UIViewController的教程。 每个UIViewController都有一个按钮，带有一个显示下一个ViewController的序列。 最后一个ViewController有一个按钮“让我们开始”，该按钮应完全关闭教程

问题： 它将关闭除第一个之外的所有ViewController。我不明白为什么

我的期望：

protocol WelcomeViewDelegate {
    func dismissIntroduction()
}

class WelcomeViewController: UIViewController, WelcomeViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    func dismissIntroduction() {
        self.dismissViewControllerAnimated(true, completion: nil)
    }


    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController2
        destination.delegate = self
    }

}

class ViewController2: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController3
        destination.delegate = self.delegate
    }

}

class ViewController3: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController4
        destination.delegate = self.delegate
    }

}

class ViewController4: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressLetsStart(sender: AnyObject) {
        self.delegate!.dismissIntroduction()
    }

}

在最后一个ViewController4中，我调用了第一个ViewController的dismissinduction（）函数，因此除了所有ViewController（包括ViewController1）之外，我都应该消失。 当我在第一个ViewController上放置一个按钮并调用函数“dismission简介（）”时，它消失了

ViewController 1（WelcomeViewController）：

protocol WelcomeViewDelegate {
    func dismissIntroduction()
}

class WelcomeViewController: UIViewController, WelcomeViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    func dismissIntroduction() {
        self.dismissViewControllerAnimated(true, completion: nil)
    }


    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController2
        destination.delegate = self
    }

}

class ViewController2: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController3
        destination.delegate = self.delegate
    }

}

class ViewController3: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController4
        destination.delegate = self.delegate
    }

}

class ViewController4: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressLetsStart(sender: AnyObject) {
        self.delegate!.dismissIntroduction()
    }

}

视图控制器2:

protocol WelcomeViewDelegate {
    func dismissIntroduction()
}

class WelcomeViewController: UIViewController, WelcomeViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    func dismissIntroduction() {
        self.dismissViewControllerAnimated(true, completion: nil)
    }


    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController2
        destination.delegate = self
    }

}

class ViewController2: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController3
        destination.delegate = self.delegate
    }

}

class ViewController3: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController4
        destination.delegate = self.delegate
    }

}

class ViewController4: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressLetsStart(sender: AnyObject) {
        self.delegate!.dismissIntroduction()
    }

}

ViewController 3:

protocol WelcomeViewDelegate {
    func dismissIntroduction()
}

class WelcomeViewController: UIViewController, WelcomeViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    func dismissIntroduction() {
        self.dismissViewControllerAnimated(true, completion: nil)
    }


    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController2
        destination.delegate = self
    }

}

class ViewController2: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController3
        destination.delegate = self.delegate
    }

}

class ViewController3: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController4
        destination.delegate = self.delegate
    }

}

class ViewController4: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressLetsStart(sender: AnyObject) {
        self.delegate!.dismissIntroduction()
    }

}

ViewController4（最后一个）：

protocol WelcomeViewDelegate {
    func dismissIntroduction()
}

class WelcomeViewController: UIViewController, WelcomeViewDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    func dismissIntroduction() {
        self.dismissViewControllerAnimated(true, completion: nil)
    }


    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController2
        destination.delegate = self
    }

}

class ViewController2: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController3
        destination.delegate = self.delegate
    }

}

class ViewController3: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }        

    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destination = segue.destinationViewController as! ViewController4
        destination.delegate = self.delegate
    }

}

class ViewController4: UIViewController {

    var delegate:WelcomeViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func pressLetsStart(sender: AnyObject) {
        self.delegate!.dismissIntroduction()
    }

}

编辑： 当我两次使用dismissViewControllerAnimated函数时，它开始工作了

func dismissIntroduction() {
    self.dismissViewControllerAnimated(true, completion: nil)
    self.dismissViewControllerAnimated(true, completion: nil)
}

---

但是为什么呢？我不明白…背后的逻辑。

您正在寻找错误的问题解决方案，您需要做的是寻找放松的环节。浏览本教程：

我现在用上一个ViewController中的以下函数解决了问题：

@IBAction func pressLetsStart(sender: AnyObject) {
    self.dismissModalStack()
}

private func dismissModalStack() {
    var vc = self.presentingViewController! as UIViewController
    while (vc.presentingViewController != nil) {
        vc = vc.presentingViewController!;
    }
    vc.dismissViewControllerAnimated(true, completion: nil)
}

---

您是否尝试将这四个控制器都放在导航控制器中，并从PPViewContoller中演示NavController？我不想将其放在导航控制器中（因为导航栏）。您可以始终隐藏导航栏，如中所示，使用apple way（导航控制器）从长远来看，这是一种比遇到许多bug或维护麻烦更好的方法。谢谢mkumar，我会试试这个。这听起来真是一个干净的解决方案