Pre-populate data with SwiftUI 2.0 and Core Data

Question

How can I pre-populate data from a json into core data in SwiftUI 2.0 when the app is loaded only for the first time. In SwiftUI 1.0 I did it in the AppDelegate.swift but there is no such file anymore.

There are quite a few parts to this question - decoding JSON, doing something when app first loads (use `UserDefaults` or similar to track this), and working with CoreData. You should probably focus the question on one thing, like just about CoreData with SwiftUI 2 app lifecycle — George, Oct 24 '20 at 14:40
AppDelegate is still there - https://stackoverflow.com/questions/62538110/swiftui-app-life-cycle-ios14-where-to-put-appdelegate-code/62538373#62538373 — Asperi, Oct 24 '20 at 14:47

score -1 · Answer 1 · answered Oct 24 '20 at 15:55

Add your own AppDelegate.swift

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey :    Any]? = nil) -> Bool {
        return true
    }
}

Then in your @main View add.

@UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

for iOS or

class AppDelegate: NSObject, NSApplicationDelegate {
    func applicationDidFinishLaunching(_ notification: Notification) {
        
    }
    
}

and

@NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

for MacOS

Pre-populate data with SwiftUI 2.0 and Core Data

1 Answers1