I have an audio app and have implemented CarPlay, I've followed this guide to add CarPlay support: https://blog.fethica.com/add-carplay-support-to-swiftradio/#
The app uses the com.apple.developer.playable-content entitlement and Media Player framework, which as far as I know, has been the only way to add CarPlay to audio apps on iOS 13 and below, but is still backwards compatible with iOS 14 (despite there being a new carplay audio framework for iOS 14). All my CarPlay logic is written in an extension of my main AppDelegate (could this be problematic?)
In the simulator, everything has been working fine and the audio plays in the external simulated car display. But my team tested the app in a real car and the application crashes immediately when opened from the car display.
I have the crash log here when tested on iPhone 11 Pro on iOS 14.4:
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001b88d13cc
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [27455]
Triggered by Thread: 5
Thread 0 name:
Thread 0:
0 libsystem_kernel.dylib 0x00000001d6aa6f5c __ulock_wait + 8
1 libdispatch.dylib 0x00000001a8746794 _dlock_wait + 56 (lock.c:326)
2 libdispatch.dylib 0x00000001a87466c0 _dispatch_once_wait + 124 (lock.c:382)
3 UIKitCore 0x00000001ab1080f8 -[_UIApplicationConfigurationLoader _loadInitializationContext] + 152 (once.h:84)
4 UIKitCore 0x00000001ab108444 -[_UIApplicationConfigurationLoader applicationInitializationContext] + 32 (_UIApplicationConfigurationLoader.m:161)
5 UIKitCore 0x00000001ab0ef05c -[_UIScreenInitialDisplayConfigurationLoader initialDisplayContext] + 180 (UIScreen.m:371)
6 UIKitCore 0x00000001ab0ef348 +[UIScreen initialize] + 128 (UIScreen.m:626)
7 libobjc.A.dylib 0x00000001bdb67c58 CALLING_SOME_+initialize_METHOD + 24 (objc-initialize.mm:384)
8 libobjc.A.dylib 0x00000001bdb6e318 initializeNonMetaClass + 716 (objc-initialize.mm:554)
9 libobjc.A.dylib 0x00000001bdb6f910 initializeAndMaybeRelock(objc_class*, objc_object*, mutex_tt<false>&, bool) + 280 (objc-runtime-new.mm:2221)
10 libobjc.A.dylib 0x00000001bdb7e498 lookUpImpOrForward + 956 (objc-runtime-new.mm:2237)
11 libobjc.A.dylib 0x00000001bdb68524 _objc_msgSend_uncached + 68
12 UIKitCore 0x00000001ab33ef48 -[_UIRemoteKeyboards keyboardWindow] + 52 (_UIRemoteKeyboards.m:2036)
13 UIKitCore 0x00000001ab33cf6c -[_UIRemoteKeyboards allowedToShowKeyboard] + 96 (_UIRemoteKeyboards.m:1588)
14 UIKitCore 0x00000001ab33bda8 -[_UIRemoteKeyboards checkConnection] + 64 (_UIRemoteKeyboards.m:1315)
15 UIKitCore 0x00000001ab338b60 -[_UIRemoteKeyboards init] + 156 (_UIRemoteKeyboards.m:797)
16 UIKitCore 0x00000001ab338ab4 __43+[_UIRemoteKeyboards sharedRemoteKeyboards]_block_invoke + 20 (_UIRemoteKeyboards.m:785)
17 libdispatch.dylib 0x00000001a8745db0 _dispatch_client_callout + 20 (object.m:559)
18 libdispatch.dylib 0x00000001a87475c8 _dispatch_once_callout + 32 (once.c:52)
19 UIKitCore 0x00000001ab338a9c +[_UIRemoteKeyboards sharedRemoteKeyboards] + 176 (once.h:84)
20 UIKitCore 0x00000001ab50ccac _UIApplicationMainPreparations + 1348 (UIApplication.m:4644)
21 UIKitCore 0x00000001ab50c740 UIApplicationMain + 140 (UIApplication.m:4704)
22 MyAppName 0x000000010458fb04 main + 68 (UITextField+Extension.swift:22)
23 libdyld.dylib 0x00000001a87866b0 start + 4
Thread 1:
0 libsystem_pthread.dylib 0x00000001f4608764 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x00000001f4608764 start_wqthread + 0
Thread 3 name:
Thread 3:
0 libsystem_kernel.dylib 0x00000001d6a822d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001d6a81660 mach_msg + 76 (mach_msg.c:103)
2 libdispatch.dylib 0x00000001a875e888 _dispatch_mach_send_and_wait_for_reply + 528 (mach.c:812)
3 libdispatch.dylib 0x00000001a875ec24 dispatch_mach_send_with_result_and_wait_for_reply + 56 (mach.c:1998)
4 libxpc.dylib 0x00000001f4626e68 xpc_connection_send_message_with_reply_sync + 240 (connection.c:848)
5 BoardServices 0x00000001c2599958 -[BSXPCServiceConnectionMessage _sendSynchronously:] + 332 (BSXPCServiceConnectionMessage.m:129)
6 BoardServices 0x00000001c259a2cc -[BSXPCServiceConnectionMessage sendSynchronouslyWithError:] + 256 (BSXPCServiceConnectionMessage.m:182)
7 BoardServices 0x00000001c2584afc __71+[BSXPCServiceConnectionProxy createImplementationOfProtocol:forClass:]_block_invoke + 824 (BSXPCServiceConnectionProxy.m:274)
8 UIKitServices 0x00000001acb7fc6c -[UISApplicationSupportClient applicationInitializationContextWithParameters:] + 272 (UISApplicationSupportClient.m:77)
9 UIKitCore 0x00000001ab108278 __63-[_UIApplicationConfigurationLoader _loadInitializationContext]_block_invoke_2 + 228 (_UIApplicationConfigurationLoader.m:135)
10 UIKitCore 0x00000001ab108188 __UIAPPLICATION_IS_LOADING_INITIALIZATION_INFO_FROM_THE_SYSTEM__ + 28 (_UIApplicationConfigurationLoader.m:30)
11 UIKitCore 0x00000001ab108160 __63-[_UIApplicationConfigurationLoader _loadInitializationContext]_block_invoke + 100 (_UIApplicationConfigurationLoader.m:106)
12 libdispatch.dylib 0x00000001a8745db0 _dispatch_client_callout + 20 (object.m:559)
13 libdispatch.dylib 0x00000001a87475c8 _dispatch_once_callout + 32 (once.c:52)
14 UIKitCore 0x00000001ab1080f8 -[_UIApplicationConfigurationLoader _loadInitializationContext] + 152 (once.h:84)
15 UIKitCore 0x00000001ab108408 __70-[_UIApplicationConfigurationLoader startPreloadInitializationContext]_block_invoke + 28 (_UIApplicationConfigurationLoader.m:154)
16 libdispatch.dylib 0x00000001a874424c _dispatch_call_block_and_release + 32 (init.c:1454)
17 libdispatch.dylib 0x00000001a8745db0 _dispatch_client_callout + 20 (object.m:559)
18 libdispatch.dylib 0x00000001a8756a68 _dispatch_root_queue_drain + 656 (inline_internal.h:2548)
19 libdispatch.dylib 0x00000001a8757120 _dispatch_worker_thread2 + 116 (queue.c:6777)
20 libsystem_pthread.dylib 0x00000001f46017d8 _pthread_wqthread + 216 (pthread.c:2223)
21 libsystem_pthread.dylib 0x00000001f460876c start_wqthread + 8
Thread 4:
0 libsystem_pthread.dylib 0x00000001f4608764 start_wqthread + 0
Thread 5 name:
Thread 5 Crashed:
0 FrontBoardServices 0x00000001b88d13cc -[FBSSceneParameters initWithSpecification:] + 228 (FBSSceneParameters.m:34)
1 FrontBoardServices 0x00000001b88d1320 -[FBSSceneParameters initWithSpecification:] + 56 (FBSSceneParameters.m:34)
2 FrontBoardServices 0x00000001b88d1dd8 -[FBSSceneParameters initWithXPCDictionary:] + 128 (FBSSceneParameters.m:150)
3 BaseBoard 0x00000001ad165af4 _BSXPCDecodeObject + 1892 (BSXPCCoder.m:583)
4 BaseBoard 0x00000001ad1639c0 _BSXPCDecodeObjectForKey + 268 (BSXPCCoder.m:459)
5 BoardServices 0x00000001c2585f30 +[BSXPCServiceConnectionProxy decodeArguments:outArgs:fromMessage:forConnection:] + 1608 (BSXPCServiceConnectionProxy.m:592)
6 BoardServices 0x00000001c2583ab0 -[BSXPCServiceConnectionProxy invokeMessage:onTarget:] + 276 (BSXPCServiceConnectionProxy.m:342)
7 BoardServices 0x00000001c258a994 __63-[BSXPCServiceConnectionEventHandler connection:handleMessage:]_block_invoke + 536 (BSXPCServiceConnectionEventHandler.m:261)
8 BoardServices 0x00000001c25a0284 BSXPCServiceConnectionExecuteCallOut + 316 (BSXPCServiceConnection.m:1049)
9 BoardServices 0x00000001c258a708 -[BSXPCServiceConnectionEventHandler connection:handleMessage:] + 172 (BSXPCServiceConnectionEventHandler.m:250)
10 BoardServices 0x00000001c259f668 -[BSXPCServiceConnection _connection_handleMessage:fromPeer:withHandoff:] + 572 (BSXPCServiceConnection.m:834)
11 libdispatch.dylib 0x00000001a874424c _dispatch_call_block_and_release + 32 (init.c:1454)
12 libdispatch.dylib 0x00000001a8745db0 _dispatch_client_callout + 20 (object.m:559)
13 libdispatch.dylib 0x00000001a874d10c _dispatch_lane_serial_drain + 580 (inline_internal.h:2548)
14 libdispatch.dylib 0x00000001a874dc90 _dispatch_lane_invoke + 460 (queue.c:3862)
15 libdispatch.dylib 0x00000001a874cfd8 _dispatch_lane_serial_drain + 272 (inline_internal.h:2589)
16 libdispatch.dylib 0x00000001a874dc90 _dispatch_lane_invoke + 460 (queue.c:3862)
17 libdispatch.dylib 0x00000001a8757d78 _dispatch_workloop_worker_thread + 708 (queue.c:6601)
18 libsystem_pthread.dylib 0x00000001f4601814 _pthread_wqthread + 276 (pthread.c:2210)
19 libsystem_pthread.dylib 0x00000001f460876c start_wqthread + 8
Thread 6 name:
Thread 6:
0 libsystem_kernel.dylib 0x00000001d6a822d0 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001d6a81660 mach_msg + 76 (mach_msg.c:103)
2 IOKit 0x00000001b3b68340 io_hideventsystem_copy_property + 172 (IOHIDEventSystemMIGUser.c:3056)
3 IOKit 0x00000001b3b22c60 IOHIDEventSystemClientCopyProperty + 128 (IOHIDEventSystemClient.c:1097)
4 IOKit 0x00000001b3b22354 __IOHIDEventSystemClientRefresh + 1148 (IOHIDEventSystemClient.c:539)
5 IOKit 0x00000001b3b230cc IOHIDEventSystemClientCreateWithType + 856 (IOHIDEventSystemClient.c:749)
6 BackBoardServices 0x00000001ac0dda88 ___getHIDEventSystemClient_block_invoke + 288 (BKSHIDEvent.m:93)
7 libdispatch.dylib 0x00000001a8745db0 _dispatch_client_callout + 20 (object.m:559)
8 libdispatch.dylib 0x00000001a87475c8 _dispatch_once_callout + 32 (once.c:52)
9 BackBoardServices 0x00000001ac0dd964 BKSHIDEventRegisterEventCallbackOnRunLoop + 152 (once.h:84)
10 UIKitCore 0x00000001ab5babe4 -[UIEventFetcher threadMain] + 416 (UIEventFetcher.m:720)
11 Foundation 0x00000001a9ee7a34 __NSThread__start__ + 864 (NSThread.m:724)
12 libsystem_pthread.dylib 0x00000001f45ffcb0 _pthread_start + 320 (pthread.c:881)
13 libsystem_pthread.dylib 0x00000001f4608778 thread_start + 8
Thread 7:
0 libsystem_pthread.dylib 0x00000001f4608764 start_wqthread + 0
Thread 5 crashed with ARM Thread State (64-bit):
x0: 0x000000020ba16880 x1: 0x000000020ba16880 x2: 0x0000000000000000 x3: 0x00000000000008fd
x4: 0x0000000000000000 x5: 0x00000001bdb9873e x6: 0x000000000000006e x7: 0x0000000000000fb0
x8: 0x85f836c8121c001f x9: 0x85f836c8121c001f x10: 0x0000000000005403 x11: 0x0000000281a71540
x12: 0x00000000000000aa x13: 0x0000000000000001 x14: 0x00000000000000ac x15: 0x0000000000000182
x16: 0x00000002c6d90f88 x17: 0x0000000208ac3dc8 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x0000000281472eb0 x21: 0x0000000000000000 x22: 0x0000000000000000 x23: 0x00000001f75f31f5
x24: 0x000000020ba160d8 x25: 0x0000000000000000 x26: 0x00000001f7ff3288 x27: 0x000000020ba160b0
x28: 0x0000000000000000 fp: 0x000000016bb2e130 lr: 0x86106081b88d1320
sp: 0x000000016bb2e100 pc: 0x00000001b88d13cc cpsr: 0x60000000
esr: 0xf2000000 Address size fault
What could be causing the app to crash in a real car but work fine in the simulator? Here is part of my AppDelegate where I call a function to setup carplay:
import UIKit
import AVFoundation
import AVKit
import GoogleInteractiveMediaAds
import MediaPlayer
import GoogleMobileAds
import UserNotifications
import WebKit
import SafariServices
import Hero
import Firebase
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
static let reachable = "Reachable"
static let unReachable = "UnReachable"
let reachability = try! Reachability()
var iOSStream: String?
var preRolladUrl: String?
var window: UIWindow?
var adType: String?
var adServer: String?
var adFeed: String?
var miniPlayer: PlayerPopupControlViewController?
var selectedStation: Players!
// CarPlay
var playableContentManager: MPPlayableContentManager?
let carplayPlaylist = CarPlayPlaylist()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
UINavigationBar.appearance().barTintColor = UIColor.black
UINavigationBar.appearance().tintColor = UIColor.black
UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
UINavigationBar.appearance().isTranslucent = false
if UserDefaults.standard.object(forKey: UserDefaultsConstants.resumeRadioInBackground) == nil {
UserDefaults.standard.set(true, forKey: UserDefaultsConstants.resumeRadioInBackground)
UserDefaults.standard.synchronize()
}
self.setupBaseURL()
// Override point for customization after application launch.
self.startObservingReachability()
UIApplication.shared.beginReceivingRemoteControlEvents()
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
try AVAudioSession.sharedInstance().setActive(true)
} catch {
AppLogger.error(error)
}
UNUserNotificationCenter.current().delegate = self
UserDefaults.standard.set(false, forKey: UserDefaultsConstants.isMiniPlayerDisplayed)
UserDefaults.standard.synchronize()
SettingsDataManager.sharedInstance.selectedStation = SettingsDataManager.sharedInstance.getSelectedStationFromUserDefaults()
registerForPushNotifications()
setupCarPlay()
FirebaseApp.configure()
return true
}
AppDelegate+CarPlay.swift
import Foundation
import MediaPlayer
extension AppDelegate{
func setupCarPlay() {
playableContentManager = MPPlayableContentManager.shared()
playableContentManager?.delegate = self
playableContentManager?.dataSource = self
self.carplayPlaylist.setupCommandCenter()
}
}
extension AppDelegate: MPPlayableContentDelegate {
// This is called when user selects a 'playable' item (MPContentItem)
func playableContentManager(_ contentManager: MPPlayableContentManager, initiatePlaybackOfContentItemAt indexPath: IndexPath, completionHandler: @escaping (Error?) -> Void) {
self.carplayPlaylist.playerData = SettingsDataManager.sharedInstance.playerData ?? []
// guard let miniPlayer = self.miniPlayer else {return}
DispatchQueue.main.async {
// App should play music either from the radio stream or podcasts
if indexPath.count == 2 {
if(indexPath[0] == 0) {
// When user selects playable item within Radio tab
if (self.carplayPlaylist.playerData.count > 0) {
if let stationURL = URL(string: self.carplayPlaylist.playerData[indexPath[1]].streams?.iOS ?? "") {
self.carplayPlaylist.play(playURL: stationURL)
SettingsDataManager.sharedInstance.selectedStation = self.carplayPlaylist.playerData[indexPath[1]]
}
}
}
}
completionHandler(nil)
// Workaround to make the Now Playing working on the simulator:
#if targetEnvironment(simulator)
UIApplication.shared.endReceivingRemoteControlEvents()
UIApplication.shared.beginReceivingRemoteControlEvents()
#endif
}
}
func beginLoadingChildItems(at indexPath: IndexPath, completionHandler: @escaping (Error?) -> Void) {
carplayPlaylist.load { error in
completionHandler(error)
}
}
}
extension AppDelegate: MPPlayableContentDataSource {
func numberOfChildItems(at indexPath: IndexPath) -> Int {
if indexPath.indices.count == 0 {
// This returns the number of tabs at the top of the CarPlay display
return 1 // changed to 1 to allow only radio streams
} else if indexPath.indices.count == 1 {
// This returns the number of rows within each tab
if indexPath[0] == 0 {
// Radio Stations rows
return carplayPlaylist.playerData.count
} else {
// Podcasts feed rows
return 0 // Return 0 while podcasts are disabled
}
} else {
return 0
}
}
func contentItem(at indexPath: IndexPath) -> MPContentItem? {
let playerData = carplayPlaylist.playerData
// let podCastsFeeds = carplayPlaylist.podCastSettings?.podcasts_feeds
if indexPath.count == 1 {
// Tab section
let item: MPContentItem
if (indexPath[0] == 0) {
// Radio Stations Tab Section
item = MPContentItem(identifier: "Radio")
item.title = "Radio"
item.artwork = MPMediaItemArtwork(boundsSize: #imageLiteral(resourceName: "NavIcon-Broadcast").size, requestHandler: { _ -> UIImage in
return #imageLiteral(resourceName: "NavIcon-Broadcast")
})
} else {
// Podcast Tab Section
item = MPContentItem(identifier: "Podcasts")
item.title = "Podcasts"
item.artwork = MPMediaItemArtwork(boundsSize: #imageLiteral(resourceName: "NavIcon-Podcasts").size, requestHandler: { _ -> UIImage in
return #imageLiteral(resourceName: "NavIcon-Podcasts")
})
}
item.isContainer = true
item.isPlayable = false
return item
} else if indexPath.count == 2, indexPath.item < playerData.count, indexPath[0] == 0 {
// Radio station items section
let station = playerData[indexPath.item]
let item = MPContentItem(identifier: "\(station.name)")
item.title = station.name
item.subtitle = station.call_letters
item.isPlayable = true
item.isStreamingContent = true
item.downloadImageAndSetArtwork(from: station.logo ?? "", completion: {})
return item
} else {
return nil
}
}
}
///extension to downlaod the image from the api
extension MPContentItem {
func getData(from url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
URLSession.shared.dataTask(with: url, completionHandler: completion).resume()
}
func downloadImageAndSetArtwork(from address: String, completion: @escaping () -> Void) {
let defaultImage = #imageLiteral(resourceName: "NavIcon-Music")
let defaultArtwork = MPMediaItemArtwork(boundsSize: defaultImage.size, requestHandler: { _ -> UIImage in
return defaultImage
})
guard let url = URL(string: address) else {
self.artwork = defaultArtwork
return
}
getData(from: url) {
data, response, error in
guard let data = data, error == nil else {
AppLogger.error("Image Error")
self.artwork = defaultArtwork
return
}
DispatchQueue.main.async() {
guard let image = UIImage(data: data) else {
self.artwork = defaultArtwork
return
}
self.artwork = MPMediaItemArtwork(boundsSize: image.size, requestHandler: { _ -> UIImage in
return image
})
completion()
}
}
}
}
CarPlayPlaylist.swift
import Foundation
//import UIKit
import AVKit
import MediaPlayer
class CarPlayPlaylist {
let radioPlayer = FRadioPlayer.shared
var playerData: [Players] = []
var podCastItemsArray: [[Item]] = []
var podCastSettings: Podcast_settings?
var podCastFeedNameArray:[String] = []
var isFromCarPlay: Bool = false
var playButtonStatus: Bool = false
var currentPodcastItem: Item?
func load(_ completion: @escaping (Error?) -> Void) {
// if (self.podCastFeedNameArray.count == 0 && self.podCastItemsArray.count == 0) {
// getPodcastDataFromSettingsDataManager()
//
// let podcastFeedsCount = self.podCastSettings?.podcasts_feeds?.count ?? 0
// podCastItemsArray = [[Item]](repeating: [], count: podcastFeedsCount)
// }
self.playerData = SettingsDataManager.sharedInstance.playerData ?? []
completion(nil)
}
func play (playURL: URL) {
isFromCarPlay = true
self.radioPlayer.radioURL = playURL
self.radioPlayer.play()
}
func setupCommandCenter () {
MPNowPlayingInfoCenter.default().nowPlayingInfo = [MPMediaItemPropertyTitle: "Current Playing song"]
MPNowPlayingInfoCenter.default().nowPlayingInfo![MPNowPlayingInfoPropertyPlaybackRate] = 0.0
let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.playCommand.isEnabled = true
commandCenter.pauseCommand.isEnabled = true
commandCenter.playCommand.addTarget { [weak self] (event) -> MPRemoteCommandHandlerStatus in
self?.radioPlayer.play()
// NotificationCenter.default.post(name: NSNotification.Name(rawValue: NotificationCenterConstants.carPlayDidPlay), object: nil, userInfo: nil)
return .success
}
commandCenter.pauseCommand.addTarget { [weak self] (event) -> MPRemoteCommandHandlerStatus in
self?.radioPlayer.pause()
// NotificationCenter.default.post(name: NSNotification.Name(rawValue: NotificationCenterConstants.carPlayDidPause), object: nil, userInfo: nil)
return .success
}
}
}
extension CarPlayPlaylist {
func addCommandCenterNotificationObservers() {
NotificationCenter.default.addObserver(self, selector: #selector(commandCenterDidPlay), name: NSNotification.Name(rawValue: NotificationCenterConstants.commandCenterDidPlay), object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(commandCenterDidPause), name: NSNotification.Name(rawValue: NotificationCenterConstants.commandCenterDidPause), object: nil)
}
func removeCommandCenterObservers() {
NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NotificationCenterConstants.commandCenterDidPlay), object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NotificationCenterConstants.commandCenterDidPause), object: nil)
}
@objc func commandCenterDidPlay() {
// Playback rate should change the playback status
MPNowPlayingInfoCenter.default().nowPlayingInfo?[MPNowPlayingInfoPropertyPlaybackRate] = 0.0
}
@objc func commandCenterDidPause() {
// Playback rate should change the playback status
MPNowPlayingInfoCenter.default().nowPlayingInfo?[MPNowPlayingInfoPropertyPlaybackRate] = 1.0
}
}