TwitterTutorialApp(2).swift

import SwiftUI

@main
struct TwitterTutorialApp: App {
    @StateObject var twitterAPI = TwitterAPI()
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(twitterAPI)
                .onOpenURL { url in // 1
                    guard let urlScheme = url.scheme,
                          let callbackURL = URL(string: "\(TwitterAPI.ClientCredentials.CallbackURLScheme)://"),
                          let callbackURLScheme = callbackURL.scheme
                    else { return } // 2
                
                    guard urlScheme.caseInsensitiveCompare(callbackURLScheme) == .orderedSame
                    else { return } // 3
                    
                    twitterAPI.onOAuthRedirect.send(url) // 4
                }
        }
    }
}