ios:how 要在 swift 中的导航项的后退按钮上添加 google 广告？

Question

 let backButton = UIBarButtonItem(
        title: "",
        style: UIBarButtonItemStyle.Plain,
        target: nil,
        action: nil
    );
    self.navigationController!.navigationBar.tintColor = UIColor.whiteColor()
    self.navigationController!.navigationBar.topItem!.backBarButtonItem = backButton;

i have use above code and i want to add google Interstitial ads in back button of navigation item. my requirement is when i press back from second viewcontroller ads. should would be come and when i close ads. first view controller should open.

谢谢

Answer 1

创建后退按钮时，您应该为该后退按钮定义 selector/action 方法。

let backButton = UIBarButtonItem(
    title: "",
    style: UIBarButtonItemStyle.Plain,
    target: self,
    action: #selector(backButtonPressed)
)

在同一个控制器中，您可以拥有在单击后退按钮后执行的方法

func backButtonPressed(){
   Print("Back Button Pressed")

   //Write code for showing google ads here.

}

Answer 2

我通过在 secondViewController 中添加以下代码解决了我的问题。及其完美的工作。

 override func viewWillDisappear(animated: Bool) {
    if (interstitial.isReady && showAd) {
        showAd = false
        print("iterstitalMain is ready")
        interstitial.presentFromRootViewController(parentViewController!)
        self.createAndLoadInterstitial()
    }
    else{
    }
}