ios - 关闭一个 ViewController 并呈现另一个 ViewController - IOS - Swift 3

Question

我想关闭一个 ViewController 并呈现另一个 ViewController。这是我的代码:

主VC:

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

第一个 View Controller :

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()
    })
}

第二个 View Controller :

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
    })
}

我收到此错误:“FirstViewController 上的 SecondViewController 其 View 不在窗口层次结构中!”

并且它不会显示。所以基本上我希望 SecondViewController 成为 SecondViewController 和 MainVC didLoad 之间的一种插页式广告

基本方案:

FirstViewController->SecondViewController->MainVC

如果您提出任何建议，我们将不胜感激。谢谢!

Answer 1

您不应使用静态函数来创建 View Controller 。显示插页式广告的正确方法首先打开 mainviewcontroller 并 onViewDidAppear 显示您的广告 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 

}

协议(protocol)(委托(delegate))示例

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

    func onFirstViewControllerDismissed()

}

以及你的实时 View Controller 在firstviewcontroller之前

class LiveViewController: UIViewController, LiveProtocol {

    ...

    internal func onFirstViewControllerDismissed() {

        // present your interstitial 

    }

}