Hi
I identified an issue that I cannot resolve with CarPlay. I am now rewriting an existing app that I initially created with ObjectiveC/Swift/UIKit. The new app should be super elegant, and of course SwiftUI based.
The thing is, if I use the old App Lifecycle (using App Delegates or Scene Delegates) without SwiftUI, everything works fine and smooth. However, I don't really want that, but rather have a single code base and not mess with ****** workarounds.
The funny thing is, if I place the @main item to the SwiftUI part, it tells me the life cycle would not be implemented, but it is.
Anybody has an idea?
Or this is a bug in SwiftUI / CarPlay?
I was trying to find some original code reference from Apple related to SwiftUI base apps and having a CarPlay 'extension' but couldn't find any - the latest WWDC code example was still based on the old framework
Thanks
Marco
Here are the files
import UIKit
import SwiftUI
@main // < == if @main is here, it DOES NOT WORK fine -- using non Swift UI app cycle
/*
2022-11-11 12:24:34.516461+0100 CarPlayTutorial[49059:1094508] *** Terminating app due to uncaught exception 'NSGenericException', reason: 'Application does not implement CarPlay template application lifecycle methods in its scene delegate.'
...
CoreSimulator 857.13 - Device: iPhone 14 Pro (A32C27BF-48D7-48EA-A32B-26A6CC562201) - Runtime: iOS 16.1 (20B72) - DeviceType: iPhone 14 Pro
*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Application does not implement CarPlay template application lifecycle methods in its scene delegate.'
(lldb)
*/
struct testappApp: App {
@UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct ContentView: View {
var body: some View {
Text("Hallo")
}
}
//@main // < == if @main is here, it works fine -- using non Swift UI app cycle
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
return true
}
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
if (connectingSceneSession.role == UISceneSession.Role.carTemplateApplication) {
let scene = UISceneConfiguration(name: "CarPlay", sessionRole: connectingSceneSession.role)
scene.delegateClass = CarPlaySceneDelegate.self
return scene
} else {
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
}
}
the Scene Delegate that I used, but is largely ignored is
import UIKit
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
print(scene.debugDescription)
print(session.debugDescription)
print(connectionOptions.debugDescription)
guard let _ = (scene as? UIWindowScene) else { return }
}
func sceneDidDisconnect(_ scene: UIScene) {
print(scene.debugDescription)
}
func sceneDidBecomeActive(_ scene: UIScene) {
print(scene.debugDescription)
}
//...
}
The CarPlay delegate is this
class CarPlaySceneDelegate: UIResponder {
var interfaceController: CPInterfaceController?
}
extension CarPlaySceneDelegate: CPTemplateApplicationSceneDelegate {
func templateApplicationScene(_ templateApplicationScene: CPTemplateApplicationScene, didConnect interfaceController: CPInterfaceController) {
self.interfaceController = interfaceController
self.interfaceController?.delegate = self
}
private func templateApplicationScene(_ templateApplicationScene: CPTemplateApplicationScene, didDisconnect interfaceController: CPInterfaceController) {
self.interfaceController = nil
}
}
extension CarPlaySceneDelegate: CPTabBarTemplateDelegate {
func tabBarTemplate(_ tabBarTemplate: CPTabBarTemplate, didSelect selectedTemplate: CPTemplate) {
}
}
extension CarPlaySceneDelegate: CPInterfaceControllerDelegate {
func templateWillAppear(_ aTemplate: CPTemplate, animated: Bool) {
print("templateWillAppear", aTemplate)
}
func templateDidAppear(_ aTemplate: CPTemplate, animated: Bool) {
print("templateDidAppear", aTemplate)
}
func templateWillDisappear(_ aTemplate: CPTemplate, animated: Bool) {
print("templateWillDisappear", aTemplate)
}
func templateDidDisappear(_ aTemplate: CPTemplate, animated: Bool) {
print("templateDidDisappear", aTemplate)
}
}
the info plist section:
<dict>
<key>UIApplicationSupportsMultipleScenes</key>
<false/>
<key>UISceneConfigurations</key>
<dict>
<key>UIWindowSceneSessionRoleApplication</key>
<array>
<dict>
<key>UISceneConfigurationName</key>
<string>Default Configuration</string>
<key>UISceneDelegateClassName</key>
<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
</dict>
</array>
<key>UIWindowSceneSessionRoleExternalDisplay</key>
<array>
<dict>
<key>UISceneClassName</key>
<string>CPTemplateApplicationScene</string>
<key>UISceneConfigurationName</key>
<string>CarPlay</string>
<key>UISceneDelegateClassName</key>
<string>$(PRODUCT_MODULE_NAME).CarPlaySceneDelegate</string>
</dict>
</array>
</dict>
</dict>
nordfriese
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Hi there,
from the video I have the impression that a local push to talk server is required in order to let the participants of the PTT service connect and use the service. Is that correct?
If so, are there any requirements to set this up?
Generally I have not seen any information about security settings.
Can it be prevented that "outsiders" cannot connect to channels and listen to the audio messages? Furthermore, can you elaborate on potential usage of e.g. per app VPN connectivity to further enhance security?
Is it possible to maintain a catalog of actively channels so that users can "hop" from one channel to another one?
From the video I understand that an app can only join a single channel at a time.
Is there modification possible to allow users to listen to multiple channels ? Clearly users should only be able to send one audio message to one channel, but it is a under stable use case to support listening to multiple channels.
Thanks
Marco