Swift 3 /如何重用扩展

Question

我正在尝试保存代码并进行重构。

在我的项目中，我在多个UIViewController使用以下adMobBanner扩展。

整个扩展是可重用的，我只需要更改ViewController的名称即可：

extension MyVC: GADInterstitialDelegate {

但是由于我在多个类中使用它，所以这些类的长度不必要地超过了。

有某种重用扩展名的方法吗？ 就像是：

func myExtension(vc: UIViewController) {
    extension vc: GADInterstitialDelegate {
    ....
    }
}

由myExtension(MyViewController)调用

我知道这段代码是胡说八道，但是它提供了我想转置的想法。 有没有类似的东西？ 还是用重复代码保存扩展代码行的另一种选择是什么？ 非常感谢您的帮助。

我的扩展名：

extension MyViewController: GADInterstitialDelegate {

    // MARK: - Setup Ads
    func setupAds() {
        // Setup our interstitial ad initially
        interstitial.delegate = self
        interstitial.load(GADRequest())


    }

    // MARK: - Load Interstitial Ad
    func loadFullScreenAd() {
        // GADInterstitial's are single use. You have to create a new GADInterstitial for each presentation
        // So, if you'd like to show more than one GADInterstitial in your apps session we need this
        // This func will be used to create a new GADInterstitial after one has been displayed and dismissed
        interstitial = GADInterstitial(adUnitID: getAdmobInterstitial())


        interstitial.delegate = self
        interstitial.load(GADRequest())

    }


    // MARK: - Show Interstitial Ad
    func showFullScreenAd() {
        // Call this function when you want to present the interstitial ad
        // ie. game over, transition to another vc, etc...
        // Make sure you give atleast a few seconds for this ad to load before atempting to present it
        // For example, don't try to present this ad in viewDidAppear

        // Check if the interstitial ad is loaded before trying to present it

        if self.interstitial.isReady {

            self.interstitial.present(fromRootViewController: self)
        }
    }


    // MARK: - GADInterstitial Delegate Methods
    func interstitialDidReceiveAd(_ ad: GADInterstitial!) {
        print("interstitialDidReceiveAd")
        showFullScreenAd()
    }

    func interstitialWillPresentScreen(_ ad: GADInterstitial!) {
        print("interstitialWillPresentScreen")
        // If you needed to pause anything in your app this would be the place to do it
        // ie. sounds, game state, etc...
    }

    func interstitialDidDismissScreen(_ ad: GADInterstitial!) {
        print("interstitialDidDismissScreen")
        // The GADInterstitial has been shown and dismissed by the user
        // Lets load another one for the next time we want to show a GADInterstitial

        //loadFullScreenAd()

        // If you paused anything in the interstitialWillPresentScreen delegate method this is where you would resume it
    }

    func interstitial(_ ad: GADInterstitial!, didFailToReceiveAdWithError error: GADRequestError!) {
        print("interstitial didFailToReceiveAdWithError: \(error)")
    }
}

Answer 1

到目前为止，对我有用的是创建一个名为"Name regarding to the content about-extension of class的文件，然后将其放入名为Extensions的组文件夹中。因此，在您的情况下，我将这样称呼该文件：

GADInterstitialDelegate-UIViewControllerExtension.swift

里面的代码是这样的：

extension UIViewController: GADInterstitialDelegate {
// your reusable code
}

这只是我的方法，我认为也有其他好的方法

Answer 2

扩展所有受影响的视图控制器的公共超类（可能是UIViewController本身），然后可以在所有子类中使用代码。