Injection III setup for SwiftUI

injection_setup.swift

// SwiftUI Preview in Xcode is unreliabale and slow. So I started using InjectionIII plugin for previewing.

// AppDelegate setup
import SwiftUI
class InjectedAppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        #if DEBUG
        var injectionBundlePath = "/Applications/InjectionIII.app/Contents/Resources"
        #if targetEnvironment(macCatalyst)
        injectionBundlePath = "\(injectionBundlePath)/macOSInjection.bundle"
        #elseif os(iOS)
        injectionBundlePath = "\(injectionBundlePath)/iOSInjection.bundle"
        #endif
        Bundle(path: injectionBundlePath)?.load()
        #endif
        return true
    }

}
// SwiftUI App setup
@main
struct MyApp: App {
    @UIApplicationDelegateAdaptor(InjectedAppDelegate.self) var appDelegate
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }

}
// Call site
// use this setup to inject the SwiftUI Code on save.
// Inside the preview body
class ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }

    #if DEBUG
    @objc class func injected() {
        UIApplication.shared.windows.first?.rootViewController =
        UIHostingController(rootView: ContentView())
    }

    #endif
}