Thank you Claude! I changed the IP address of my Mac manually for testing the app. Even though I didn't get the expected result (seeing the popup message), but I think your answer has got to the bottom of the specific question I asked.

Hi Claude31, OOPer, Thank you for pointing out what I missed. I check the individual targets and found the "iOS Deployment Target". After updating each of them to iOS 14.1, I can delete the unnecessary code now.

Hi OOper, For the "UIKit App Delegate" option of Life Cycle, I found it is only available if I chose "iOS" App template for the new project. If I chose "Multiplatform" template, then there is no Life Cycle choices for me to select. Thank you!

Hi OOper, Thank you for your suggestion about using Life Cycle as UIKit App Delegate. I will try it. On another hand, I found a way to get a UIViewController object from ContentView.swift file, like the code below. Is this solution Ok? or there will be issue? Thank you! import SwiftUI import MoPubSDK struct ContentView: View {     var body: some View {         return         Text("Hello, world!")             .padding()             .onAppear(){                 // for MoPub: Check whether you must show the consent dialog                 let shouldShow = MoPub.sharedInstance().shouldShowConsentDialog;                 // for MoPub: Start loading the consent dialog. This call fails if the user has opted out of ad personalization                 let myUIViewController : UIViewController = (UIApplication.shared.windows.first?.rootViewController)!                 MoPub.sharedInstance().loadConsentDialog(){ a in                     MoPub.sharedInstance().showConsentDialog(from: myUIViewController, completion: nil)                 }             }     } }