關閉一個ViewController並顯示另一個ViewControlloer-IOS-Swift 3

Question

我想解雇一個ViewController並提出另一個ViewController。 這是我的代碼：

MainVC：

@IBAction func loadFirstVCClicked(_ sender: UIButton)
{
    self.present(FirstViewController.loadVC()
}

FirstViewController：

static func load() -> FirstViewController
{
    let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "FirstViewController") as! FirstViewController
    return vc
}
@IBAction func exitClicked(_ sender: UIButton)
{
    self.dismiss(animated: true, completion: {
        self.present(SecondViewController.loadVC()
    })
}

SecondViewController：

static func loadVC() -> SecondViewController
{
    let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
    return vc
}

@IBAction func exitClicked(_ sender: UIButton)
{
    self.dismiss(animated: true, completion: {
        //present MainVC - second VC should work as an interstitial ad
    })
}

而且我得到這個錯誤：“ FirstViewController上的SecondViewController，其視圖不在窗口層次結構中！”

它不會顯示。 所以基本上我希望SecondViewController成為SecondViewController的廢料和MainVC didLoad之間的一種插頁式廣告

基本方案：

FirstViewController-> SecondViewController-> MainVC

您的任何建議都將不勝感激。 謝謝！

Answer 1

您不應使用靜態函數來創建視圖控制器。 顯示插頁式廣告首先打開mainviewcontroller和onViewDidAppear的正確方法顯示您的廣告viewcontroller

@IBAction func loadFirstVCClicked(_ sender: UIButton)
{
    let firstViewController = self.storyboard?.instantiateViewController(withIdentifier: "FirstViewController") as! FirstViewController
    self.present(firstViewController)
}

@IBAction func loadMainVCClicked(_ sender: UIButton)
{
    let mainViewController = self.storyboard?.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
    self.present(firstViewController)
}

class MainViewController: UIViewController {

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

        // there you can present your interstitial viewcontroller
    }

}

class InterstitialViewController: UIViewController {

    // when user press close or after a time limit dismiss 

}

協議（委托）樣本

// give the name you want
protocol LiveProtocol: class {

    func onFirstViewControllerDismissed()

}

和您的實時ViewController在firstviewController之前

class LiveViewController: UIViewController, LiveProtocol {

    ...

    internal func onFirstViewControllerDismissed() {

        // present your interstitial 

    }

}