Duplicate CallTutorial in order to have one specifically for CallKit / PushKit integration

This commit is contained in:
QuentinArguillere
2020-08-10 16:44:52 +02:00
parent 9974108511
commit 55e93d7053
17 changed files with 1385 additions and 0 deletions

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//
// AppDelegate.swift
// CallTutorial
//
// Created by QuentinArguillere on 31/07/2020.
// Copyright © 2020 BelledonneCommunications. All rights reserved.
//
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
// MARK: UISceneSession Lifecycle
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
}

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{
"images" : [
{
"idiom" : "iphone",
"scale" : "2x",
"size" : "20x20"
},
{
"idiom" : "iphone",
"scale" : "3x",
"size" : "20x20"
},
{
"idiom" : "iphone",
"scale" : "2x",
"size" : "29x29"
},
{
"idiom" : "iphone",
"scale" : "3x",
"size" : "29x29"
},
{
"idiom" : "iphone",
"scale" : "2x",
"size" : "40x40"
},
{
"idiom" : "iphone",
"scale" : "3x",
"size" : "40x40"
},
{
"idiom" : "iphone",
"scale" : "2x",
"size" : "60x60"
},
{
"idiom" : "iphone",
"scale" : "3x",
"size" : "60x60"
},
{
"idiom" : "ipad",
"scale" : "1x",
"size" : "20x20"
},
{
"idiom" : "ipad",
"scale" : "2x",
"size" : "20x20"
},
{
"idiom" : "ipad",
"scale" : "1x",
"size" : "29x29"
},
{
"idiom" : "ipad",
"scale" : "2x",
"size" : "29x29"
},
{
"idiom" : "ipad",
"scale" : "1x",
"size" : "40x40"
},
{
"idiom" : "ipad",
"scale" : "2x",
"size" : "40x40"
},
{
"idiom" : "ipad",
"scale" : "1x",
"size" : "76x76"
},
{
"idiom" : "ipad",
"scale" : "2x",
"size" : "76x76"
},
{
"idiom" : "ipad",
"scale" : "2x",
"size" : "83.5x83.5"
},
{
"idiom" : "ios-marketing",
"scale" : "1x",
"size" : "1024x1024"
}
],
"info" : {
"author" : "xcode",
"version" : 1
}
}

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{
"info" : {
"author" : "xcode",
"version" : 1
}
}

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="EHf-IW-A2E">
<objects>
<viewController id="01J-lp-oVM" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="53" y="375"/>
</scene>
</scenes>
</document>

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//
// CallExample.swift
// CallTutorial
//
// Created by QuentinArguillere on 31/07/2020.
// Copyright © 2020 BelledonneCommunications. All rights reserved.
//
import linphonesw
import AVFoundation
class CallExampleContext : ObservableObject
{
var mCore: Core! // We need a Core for... anything, basically
@Published var coreVersion: String = Core.getVersion
/*------------ Logs related variables ------------------------*/
var log : LoggingService?
var logManager : LinphoneLoggingServiceManager?
@Published var logsEnabled : Bool = true
/*------------ Call tutorial related variables ---------------*/
let mCallStateTracer = CallStateDelegate()
var mCall: Call!
var proxy_cfg : ProxyConfig!
var mVideoDevices : [String] = []
var mUsedVideoDeviceId : Int = 0
var callAlreadyStopped = false;
@Published var audioEnabled : Bool = true
@Published var videoEnabled : Bool = false
@Published var speakerEnabled : Bool = false
@Published var callRunning : Bool = false
@Published var isCallIncoming : Bool = false
@Published var dest : String = "sip:arguillq@sip.linphone.org"
let mRegistrationDelegate = LinphoneRegistrationDelegate()
@Published var id : String = "sip:peche5@sip.linphone.org"
@Published var passwd : String = "peche5"
@Published var loggedIn: Bool = false
var mProviderDelegate : CallKitProviderDelegate!
let outgoingCallName = "Outgoing call example"
let incomingCallName = "Incoming call example"
init()
{
mProviderDelegate = CallKitProviderDelegate(context : self)
mCallStateTracer.tutorialContext = self
mRegistrationDelegate.tutorialContext = self
let factory = Factory.Instance // Instanciate
logManager = LinphoneLoggingServiceManager()
logManager!.tutorialContext = self;
log = LoggingService.Instance
log!.addDelegate(delegate: logManager!)
log!.logLevel = LogLevel.Debug
factory.enableLogCollection(state: LogCollectionState.Enabled)
// Initialize Linphone Core
try? mCore = factory.createCore(configPath: "", factoryConfigPath: "", systemContext: nil)
// main loop for receiving notifications and doing background linphonecore work:
mCore.autoIterateEnabled = true
mCore.callkitEnabled = true
mCore.pushNotificationEnabled = true
try? mCore.start()
mVideoDevices = mCore.videoDevicesList
mCore.addDelegate(delegate: mCallStateTracer)
mCore.addDelegate(delegate: mRegistrationDelegate)
}
func registrationExample()
{
let factory = Factory.Instance
do {
proxy_cfg = try mCore.createProxyConfig()
let address = try factory.createAddress(addr: id)
let info = try factory.createAuthInfo(username: address.username, userid: "", passwd: passwd, ha1: "", realm: "", domain: address.domain)
mCore.addAuthInfo(info: info)
try proxy_cfg.setIdentityaddress(newValue: address)
let server_addr = "sip:" + address.domain + ";transport=tls"
try proxy_cfg.setServeraddr(newValue: server_addr)
proxy_cfg.registerEnabled = true
try mCore.addProxyConfig(config: proxy_cfg)
if ( mCore.defaultProxyConfig == nil)
{
// IMPORTANT : default proxy config setting MUST be done AFTER adding the config to the core !
mCore.defaultProxyConfig = proxy_cfg
}
} catch {
print(error)
}
}
func createCallParams() throws -> CallParams
{
let callParams = try mCore.createCallParams(call: nil)
callParams.videoEnabled = videoEnabled;
callParams.audioEnabled = audioEnabled;
return callParams
}
// Initiate a call
func outgoingCallExample()
{
do {
if (!callRunning)
{
let callDest = try Factory.Instance.createAddress(addr: dest)
// Place an outgoing call
mCall = mCore.inviteAddressWithParams(addr: callDest, params: try createCallParams())
if (mCall == nil) {
print("Could not place call to \(dest)\n")
} else {
print("Call to \(dest) is in progress...")
mProviderDelegate.outgoingCallUUID = UUID()
}
}
else
{
try mCall.update(params: createCallParams())
}
} catch {
print(error)
}
}
// Terminate a call
func stopCall()
{
if ((callRunning || isCallIncoming) && mCall.state != Call.State.End)
{
callAlreadyStopped = true;
// terminate the call
print("Terminating the call...\n")
mProviderDelegate.stopCall()
}
}
func speaker()
{
speakerEnabled = !speakerEnabled
do {
try AVAudioSession.sharedInstance().overrideOutputAudioPort(
speakerEnabled ?
AVAudioSession.PortOverride.speaker : AVAudioSession.PortOverride.none
)
} catch {
print(error)
}
}
func changeVideoDevice()
{
mUsedVideoDeviceId = (mUsedVideoDeviceId + 1) % mVideoDevices.count
do {
try mCore.setVideodevice(newValue: mVideoDevices[mUsedVideoDeviceId])
} catch {
print(error)
}
}
func acceptCall()
{
do {
try mCall.accept()
} catch {
print(error)
}
}
}
// Callback for actions when a change in the Registration State happens
class LinphoneRegistrationDelegate: CoreDelegate {
var tutorialContext : CallExampleContext!
override func onRegistrationStateChanged(lc: Core, cfg: ProxyConfig, cstate: RegistrationState, message: String?) {
print("New registration state \(cstate) for user id \( String(describing: cfg.identityAddress?.asString()))\n")
if (cstate == .Ok)
{
if (!tutorialContext.loggedIn)
{
tutorialContext.mProviderDelegate.registerForVoIPPushes()
}
tutorialContext.loggedIn = true
}
}
}
class LinphoneLoggingServiceManager: LoggingServiceDelegate {
var tutorialContext : CallExampleContext!
override func onLogMessageWritten(logService: LoggingService, domain: String, lev: LogLevel, message: String) {
if (tutorialContext.logsEnabled)
{
print("Logging service log: \(message)s\n")
}
}
}
// Callback for actions when a change in the Call State happens
class CallStateDelegate: CoreDelegate {
var tutorialContext : CallExampleContext!
override func onCallStateChanged(lc: Core, call: Call, cstate: Call.State, message: String) {
print("CallTrace - \(cstate)")
if (cstate == .IncomingReceived) {
// We're being called by someone
tutorialContext.mCall = call
tutorialContext.isCallIncoming = true
} else if (cstate == .OutgoingRinging) {
// We're calling someone
tutorialContext.callRunning = true
} else if (cstate == .End) {
// Call has been terminated by any side
if (!tutorialContext.callAlreadyStopped)
{
// Report to CallKit that the call is over
tutorialContext.mProviderDelegate.stopCall()
tutorialContext.callAlreadyStopped = false
}
tutorialContext.callRunning = false
tutorialContext.isCallIncoming = false
} else if (cstate == .StreamsRunning)
{
// Call has successfully began
tutorialContext.callRunning = true
} else if (cstate == .PushIncomingReceived)
{
print("PushTrace -- push incoming")
}
}
}

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//
// ProviderDelegate.swift
// CallTutorial
//
// Created by QuentinArguillere on 05/08/2020.
// Copyright © 2020 BelledonneCommunications. All rights reserved.
//
import Foundation
import CallKit
import PushKit
import linphonesw
import AVFoundation
class CallKitProviderDelegate : NSObject
{
private var voipRegistry: PKPushRegistry!
private let provider: CXProvider
let mCallController = CXCallController()
var tutorialContext : CallExampleContext!
var incomingCallUUID : UUID!
var outgoingCallUUID : UUID!
init(context : CallExampleContext)
{
tutorialContext = context
let providerConfiguration = CXProviderConfiguration(localizedName: Bundle.main.infoDictionary!["CFBundleName"] as! String)
providerConfiguration.supportsVideo = true
providerConfiguration.supportedHandleTypes = [.generic]
providerConfiguration.maximumCallsPerCallGroup = 1
providerConfiguration.maximumCallGroups = 1
provider = CXProvider(configuration: providerConfiguration)
super.init()
provider.setDelegate(self, queue: nil)
}
func incomingCall() {
incomingCallUUID = UUID()
let update = CXCallUpdate()
update.remoteHandle = CXHandle(type:.generic, value: tutorialContext.incomingCallName)
update.hasVideo = tutorialContext.videoEnabled
provider.reportNewIncomingCall(with: incomingCallUUID, update: update, completion: { error in })
}
func outgoingCall()
{
outgoingCallUUID = UUID()
let handle = CXHandle(type: .generic, value: tutorialContext.outgoingCallName)
let startCallAction = CXStartCallAction(call: outgoingCallUUID, handle: handle)
let transaction = CXTransaction(action: startCallAction)
provider.reportOutgoingCall(with: outgoingCallUUID, connectedAt: nil)
mCallController.request(transaction, completion: { error in })
}
func stopCall()
{
var callId = UUID();
if (tutorialContext.isCallIncoming) {
callId = incomingCallUUID
} else if (tutorialContext.callRunning) {
callId = outgoingCallUUID
}
let endCallAction = CXEndCallAction(call: callId)
let transaction = CXTransaction(action: endCallAction)
mCallController.request(transaction, completion: { error in })
}
func registerForVoIPPushes() {
voipRegistry = PKPushRegistry(queue: nil)
voipRegistry.delegate = self
voipRegistry.desiredPushTypes = [PKPushType.voIP]
}
}
extension CallKitProviderDelegate: CXProviderDelegate {
func provider(_ provider: CXProvider, perform action: CXEndCallAction) {
if (tutorialContext.mCall.state != Call.State.End)
{
try? tutorialContext.mCall.terminate()
}
action.fulfill()
}
func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {
tutorialContext.acceptCall()
action.fulfill()
}
func provider(_ provider: CXProvider, perform action: CXSetHeldCallAction) {
}
func provider(_ provider: CXProvider, perform action: CXStartCallAction) {
tutorialContext.outgoingCallExample()
action.fulfill()
}
func provider(_ provider: CXProvider, perform action: CXSetMutedCallAction) {
}
func provider(_ provider: CXProvider, perform action: CXPlayDTMFCallAction) {
}
func provider(_ provider: CXProvider, timedOutPerforming action: CXAction) {
}
func providerDidReset(_ provider: CXProvider) {
}
func provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession) {
tutorialContext.mCore.activateAudioSession(actived: true)
}
func provider(_ provider: CXProvider, didDeactivate audioSession: AVAudioSession) {
tutorialContext.mCore.activateAudioSession(actived: false)
}
}
extension CallKitProviderDelegate: PKPushRegistryDelegate {
func pushRegistry(_ registry: PKPushRegistry, didUpdate pushCredentials: PKPushCredentials, for type: PKPushType) {
print("PushTrace -- pushRegistry 1")
/*
let deviceTokenString = pushCredentials.token.map { String(format: "%02x", $0) }.joined() /*convert push tocken into hex string to be compliant with flexisip format*/
let aStr = String(format: "pn-provider=apns.dev;pn-prid=%@:voip;pn-param=Z2V957B3D6.org.linphone.tutorials.callkit.voip"
,deviceTokenString)
*/
let deviceTokenString = pushCredentials.token.map { String(format: "%02x", $0) }.joined() /*convert push tocken into hex string to be compliant with flexisip format*/
let aStr = String(format: "pn-provider=apns.dev;pn-prid=%@:voip;pn-param=Z2V957B3D6.com.belledonne.Wtest.voip"
,deviceTokenString)
tutorialContext.proxy_cfg.edit()
tutorialContext.proxy_cfg.pushNotificationAllowed = true
tutorialContext.proxy_cfg.contactUriParameters = aStr
do {
try tutorialContext.proxy_cfg.done()
} catch {
print(error)
}
}
func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType, completion: @escaping () -> Void) {
print("PushTrace -- pushRegistry 2")
incomingCall();
}
func pushRegistry(_ registry: PKPushRegistry, didInvalidatePushTokenFor: PKPushType)
{
print("PushTrace -- pushRegistry 3")
}
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>aps-environment</key>
<string>development</string>
</dict>
</plist>

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//
// ContentView.swift
// CallTutorial
//
// Created by QuentinArguillere on 31/07/2020.
// Copyright © 2020 BelledonneCommunications. All rights reserved.
//
import SwiftUI
struct ContentView: View {
@ObservedObject var tutorialContext = CallExampleContext()
func getCallButtonText() -> String
{
if (tutorialContext.callRunning) {
return "Update Call"
}
else if (tutorialContext.isCallIncoming) {
return "Answer"
}
else {
return "Call"
}
}
func callStateString() -> String
{
if (tutorialContext.callRunning) {
return "Call running"
}
else if (tutorialContext.isCallIncoming) {
return "Incoming call"
}
else {
return "No Call"
}
}
var body: some View {
VStack(alignment: .leading) {
Group {
HStack {
Text("Identity :")
.font(.subheadline)
TextField("", text : $tutorialContext.id)
.textFieldStyle(RoundedBorderTextFieldStyle())
}
HStack {
Text("Password :")
.font(.subheadline)
TextField("", text : $tutorialContext.passwd)
.textFieldStyle(RoundedBorderTextFieldStyle())
}
HStack {
Button(action: tutorialContext.registrationExample)
{
Text("Login")
.font(.largeTitle)
.foregroundColor(Color.white)
.frame(width: 90.0, height: 42.0)
.background(Color.gray)
}
Text("Login State : ")
.font(.footnote)
Text(tutorialContext.loggedIn ? "Logged in" : "Unregistered")
.font(.footnote)
.foregroundColor(tutorialContext.loggedIn ? Color.green : Color.black)
}
}
VStack(spacing: 0.0) {
Text("Call Settings")
.font(.largeTitle)
.padding(.top, 5)
HStack {
Text("Call destination :")
TextField("", text : $tutorialContext.dest)
.textFieldStyle(RoundedBorderTextFieldStyle())
}
.padding(.top, 5)
}
VStack(alignment: .leading) {
Toggle(isOn: $tutorialContext.audioEnabled) {
Text("Audio")
}.frame(width : 140.0)
Toggle(isOn: $tutorialContext.videoEnabled) {
Text("Video")
}.frame(width : 140.0)
Button(action: tutorialContext.changeVideoDevice)
{
Text(" Change camera ")
.font(.title)
.foregroundColor(Color.white)
.background(Color.gray)
}
.padding(.vertical)
HStack {
Text("Speaker :")
Button(action: tutorialContext.speaker)
{
Text(tutorialContext.speakerEnabled ? "ON" : "OFF")
.font(.title)
.foregroundColor(Color.white)
.frame(width: 60.0, height: 30.0)
.background(Color.gray)
}
}
}
.padding(.top, 5.0)
Spacer()
VStack {
HStack {
Button(action: {
if (self.tutorialContext.isCallIncoming) {
self.tutorialContext.acceptCall()
}
else {
self.tutorialContext.mProviderDelegate.outgoingCall()
}
})
{
Text(getCallButtonText())
.font(.largeTitle)
.foregroundColor(Color.white)
.frame(width: 180.0, height: 42.0)
.background(Color.green)
}
Button(action: tutorialContext.stopCall) {
Text(tutorialContext.isCallIncoming ? "Decline" : "Stop Call")
.font(.largeTitle)
.foregroundColor(Color.white)
.frame(width: 180.0, height: 42.0)
.background(Color.red)
}
}
HStack {
Text(callStateString())
.font(.footnote)
.foregroundColor(tutorialContext.callRunning || tutorialContext.isCallIncoming ? Color.green : Color.black)
}
.padding(.top)
}
Spacer()
Group {
Toggle(isOn: $tutorialContext.logsEnabled) {
Text("Logs collection")
.multilineTextAlignment(.trailing)
}
Text("Core Version is \(tutorialContext.coreVersion)")
.font(.footnote)
}
}
.padding()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>$(DEVELOPMENT_LANGUAGE)</string>
<key>CFBundleExecutable</key>
<string>$(EXECUTABLE_NAME)</string>
<key>CFBundleIdentifier</key>
<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>$(PRODUCT_NAME)</string>
<key>CFBundlePackageType</key>
<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleVersion</key>
<string>1</string>
<key>LSApplicationCategoryType</key>
<string></string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSCameraUsageDescription</key>
<string>Camera access</string>
<key>NSMicrophoneUsageDescription</key>
<string>Microphone access</string>
<key>UIApplicationSceneManifest</key>
<dict>
<key>UIApplicationSupportsMultipleScenes</key>
<false/>
<key>UISceneConfigurations</key>
<dict>
<key>UIWindowSceneSessionRoleApplication</key>
<array>
<dict>
<key>UISceneConfigurationName</key>
<string>Default Configuration</string>
<key>UISceneDelegateClassName</key>
<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
</dict>
</array>
</dict>
</dict>
<key>UIBackgroundModes</key>
<array>
<string>voip</string>
</array>
<key>UILaunchStoryboardName</key>
<string>LaunchScreen</string>
<key>UIRequiredDeviceCapabilities</key>
<array>
<string>armv7</string>
</array>
<key>UISupportedInterfaceOrientations</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationPortraitUpsideDown</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
</dict>
</plist>

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{
"info" : {
"author" : "xcode",
"version" : 1
}
}

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//
// SceneDelegate.swift
// CallTutorial
//
// Created by QuentinArguillere on 31/07/2020.
// Copyright © 2020 BelledonneCommunications. All rights reserved.
//
import UIKit
import SwiftUI
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
// Create the SwiftUI view that provides the window contents.
let contentView = ContentView()
// Use a UIHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: contentView)
self.window = window
window.makeKeyAndVisible()
}
}
func sceneDidDisconnect(_ scene: UIScene) {
// Called as the scene is being released by the system.
// This occurs shortly after the scene enters the background, or when its session is discarded.
// Release any resources associated with this scene that can be re-created the next time the scene connects.
// The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
}
func sceneDidBecomeActive(_ scene: UIScene) {
// Called when the scene has moved from an inactive state to an active state.
// Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}
func sceneWillResignActive(_ scene: UIScene) {
// Called when the scene will move from an active state to an inactive state.
// This may occur due to temporary interruptions (ex. an incoming phone call).
}
func sceneWillEnterForeground(_ scene: UIScene) {
// Called as the scene transitions from the background to the foreground.
// Use this method to undo the changes made on entering the background.
}
func sceneDidEnterBackground(_ scene: UIScene) {
// Called as the scene transitions from the foreground to the background.
// Use this method to save data, release shared resources, and store enough scene-specific state information
// to restore the scene back to its current state.
}
}