问题
I looked on SO but I wasn't able to find any question that discusses when you receive a push notification how can you then open a specific view controller. For example if you are creating an app like WhatsApp and you receive two different push notifications ie messages from two different users how would you direct from the app delegate to the respective viewController?
As far as I know in the userinfo dictionary that the appDelegate gives you you can give an ID to a specific viewController but I don't know how to give any a tribute to a specific view controller so that then you could again direct to that viewController. Kindly include a code snippet with your answer
**** Swift or Objective-C answers are both acceptable ****
回答1:
You can detect if the app opened from the notification with this code in app delegate. You will need to set the initial view controller when the application state is UIApplicationStateInactive before the app has become active. You can perform any logic there to decide which view controller should be opened and what content should be shown in that view controller.
-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
if(application.applicationState == UIApplicationStateActive) {
//app is currently active, can update badges count here
} else if(application.applicationState == UIApplicationStateBackground){
//app is in background, if content-available key of your notification is set to 1, poll to your backend to retrieve data and update your interface here
} else if(application.applicationState == UIApplicationStateInactive){
//app is transitioning from background to foreground (user taps notification), do what you need when user taps here
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>];
self.window.rootViewController = viewController;
[self.window makeKeyAndVisible];
}
}
回答2:
Here is the Swift 3 Version with switch/case instead of if/else
open func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
switch application.applicationState {
case .active:
print("do stuff in case App is active")
case .background:
print("do stuff in case App is in background")
case .inactive:
print("do stuff in case App is inactive")
}
}
回答3:
//This method is called when user tap on the notification
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
print("user clicked on the notification")
let userInfo = response.notification.request.content.userInfo
print(userInfo)
//check your response and navigate to specific view controller
moveToNextViewController()
}
func moveToNextViewController() {
//Add code for present or push view controller
let vc = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier:"ViewController") as! ViewController
self.navigationController?.pushViewController(vc, animated: true)
}
回答4:
This method is called when user tap on the notification. implement in appdelegate
var navigationC: UINavigationController?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
if USERDEFAULT.value(forKey: "isLogin") != nil {
let tabbarvc = MainStoryboard.instantiateViewController(withIdentifier: "TabBarVC") as! TabBarVC
self.navigationC = UINavigationController(rootViewController: tabbarvc)
}else {
let loginvc = MainStoryboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
self.navigationC = UINavigationController(rootViewController: loginvc)
}
self.navigationC?.setNavigationBarHidden(true, animated: false)
self.window?.clipsToBounds = true
self.window?.rootViewController = navigationC
self.window?.makeKeyAndVisible()
return true
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
print("-------------\nUser info in notification -> \(userInfo)\n-------------")
let dict = userInfo["aps"] as? NSDictionary ?? [:]
if USERDEFAULT.value(forKey:"isLogin") != nil{
let type = dict["type"] as? Int ?? 0
switch type {
case 0:
break
case 1:
for vc in self.navigationC!.viewControllers {
if vc is TabBarVc {
let exam = dict["exam"] as? String ?? ""
if exam == ""{
let TestVC = MainStoryboard.instantiateViewController(withIdentifier: "TestVC") as! TestVC
TestVC.chapterId = dict["chapter_id"] as? String ?? ""
TestVC.strSubTitle = dict["chapter"] as? String ?? ""
self.navigationC?.isNavigationBarHidden = true
self.navigationC?.pushViewController(TestVC, animated: true)
}else if exam != ""{
let ExamTestVC = MainStoryboard.instantiateViewController(withIdentifier: "ExamTestVC") as! ExamTestVC
ExamTestVC.examId = dict["exam_id"] as? String ?? ""
ExamTestVC.strSubTitle = dict["exam"] as? String ?? ""
self.navigationC?.isNavigationBarHidden = true
self.navigationC?.pushViewController(ExamTestVC, animated: true)
}
return;
}
}
break
case 2:
for vc in self.navigationC!.viewControllers {
if vc is TabBarVc {
let VideoListVC = MainStoryboard.instantiateViewController(withIdentifier: "VideoListVC") as! VideoListVC
VideoListVC.chapterId = dict["chapter_id"] as? String ?? ""
VideoListVC.video_id = dict["video_id"] as? String ?? ""
VideoListVC.strSubTitle = dict["chapter"] as? String ?? ""
VideoListVC.questionsCount = dict["question_count"] as? Int ?? 0
VideoListVC.testCount = dict["test_count"] as? Int ?? 0
self.navigationC?.isNavigationBarHidden = true
self.navigationC?.pushViewController(VideoListVC, animated: true)
return;
}
}
break
case 3:
break
default: break
}
}else{
let loginVC = SignupiPadStoryboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
SignupStoryboard = SignupiPadStoryboard
self.navigationC = UINavigationController(rootViewController: loginVC)
}
}
OR you can direct open view controller like whatsapp chat..etc.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
let userInfo = notification.request.content.userInfo
let dictAps = userInfo["aps"] as! NSDictionary
print(dictAps)
let notification_type = dictAps["notification_type"] as? Int ?? 0
if notification_type == 6{
if isChatActive == false{
completionHandler([.alert, .badge, .sound])
}else{
if USERDEFAULT.value(forKey:"isLogin") != nil{
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "ReloadChatMessages"), object: nil, userInfo: (dictAps as! [AnyHashable : Any]))
}else{
completionHandler([.alert, .badge, .sound])
}
}
}else{
completionHandler([.alert, .badge, .sound])
}
}
来源：https://stackoverflow.com/questions/37753063/how-to-make-your-push-notification-open-a-certain-view-controller