Cannot find type ‘appdelegate’ in scope

When you encounter the error “cannot find type ‘AppDelegate’ in scope” in a Swift project, it means that the compiler is unable to find the definition of the ‘AppDelegate’ class.

To fix this error, you can follow these steps:

1. Verify that you have an ‘AppDelegate.swift’ file in your project. This file should contain the definition of the ‘AppDelegate’ class.
2. Check if the ‘AppDelegate.swift’ file is included in your target’s “Compile Sources” build phase. To do this:
   1. Go to your project’s settings by selecting the project file in the Project Navigator.
   2. Select your target under “Targets”.
   3. Go to the “Build Phases” tab.
   4. Expand the “Compile Sources” section.
   5. Make sure that the ‘AppDelegate.swift’ file is listed. If not, add it using the “+” button.
3. If you have a custom name for your ‘AppDelegate’ class or have created a separate file, check if you are using the correct class name in your code. The class name should match the one in the ‘AppDelegate.swift’ file.
4. If you have recently made changes to your project structure or file names, clean and rebuild your project. Sometimes Xcode may have cached data causing unresolved references.

Here’s an example of a basic ‘AppDelegate.swift’ file:

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }
    
    // Other methods of the AppDelegate class
    
}

Make sure to adjust the content and methods of the ‘AppDelegate’ class based on your project’s requirements.