IOS app won't display push notification when in background. Swift - ios

Question

Ok so my push notification work like a charm when the app is running in the foreground. But when ever I enter into the background, the app never receives the push notification. Its like the notification falls on deaf ears.
So this is what happening. When the app is first started, I can received notification. When I close and reopen the app I can receive notification. But when the app is closed in the background I cannot receive notification. I print off when the app goes into the background and when the app becomes active so I know that its not closing I think. Because its printing that its going into the background, so it should be running.
So this is what I have for the app deligate class:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
//OTHER THINGS
//Open the Push note page
if launchOptions != nil
{
print(launchOptions)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier(myPage)
self.window?.rootViewController = vc
}
//handel push note if app is closed
//Sends it to the regular handler for push notifcaiton
//didrecivepushnotificaiton
if let remoteNotification = launchOptions?[UIApplicationLaunchOptionsRemoteNotificationKey] as? NSDictionary
{
print("Got A Push Note when I was closed")
self.application(application, didReceiveRemoteNotification: remoteNotification as [NSObject : AnyObject])
}
}
func application( application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken
deviceToken: NSData ) {
print("DEVICE TOKEN = \(deviceToken)")
//convert the device token into a string
let tokenChars = UnsafePointer<CChar>(deviceToken.bytes)
var token = ""
for i in 0..<deviceToken.length {
token += String(format: "%02.2hhx", arguments: [tokenChars[i]])
}
print("token: " + token)
//store the user device token for apns push notification
loginInformation.setObject(token, forKey: "token")
self.loginInformation.synchronize()
}
// [START ack_message_reception]
func application( application: UIApplication,
didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
print("Recived Push Notificaion")
var myMess :String = ""
var url : String = ""
var myTitle : String = ""
if var alertDict = userInfo["aps"] as? Dictionary<String, String> {
print("Alert Dict")
print(alertDict)
url = alertDict["url"]!
myMess = alertDict["alert"]!
myTitle = alertDict["mytitle"]!
//store the url for the push control view
loginInformation.setObject(url, forKey: "URL")
loginInformation.setObject(myMess, forKey: "Message")
loginInformation.setObject(myTitle, forKey: "Title")
self.loginInformation.synchronize()
}else{print("No go")}
application.applicationIconBadgeNumber = 0
//post notification.
NSNotificationCenter.defaultCenter().postNotificationName("PushReceived", object: nil, userInfo: userInfo)
if myTitle == ""
{
myTitle = “New Title“
}
if myMess == ""
{
myMess = “All Hail Gus“
}
let alert = UIAlertController(title: myTitle, message: myMess, preferredStyle: UIAlertControllerStyle.Alert)
//Close Button
alert.addAction(UIAlertAction(title: "次回", style: UIAlertActionStyle.Default, handler: nil))
self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
}
func registrationHandler(registrationToken: String!, error: NSError!) {
}
// [START receive_apns_token_error]
func application( application: UIApplication, didFailToRegisterForRemoteNotificationsWithError
error: NSError ) {
print(error)
}
I think I have all the right setting on this too. But I am not too sure now. The push notifications did work but I made a lot of changes and haven't tested them in a while.
And this is an example of the payload
{"aps":{"alert":"Gus Message.","badge":"1", "url":"https://www.gus.com","mytitle":"Gus Title"}}

Answer 1

To fully implement APNS servie, u have to handle three cases:
inactive
foreground
background
the inactive mode should be handled in didFinishLaunchingWithOptions method
//receive apns when app in inactive mode, remaining message hint display task could be sum up by the code in applicationwillenterforeground
if let options = launchOptions {
if options[UIApplicationLaunchOptionsRemoteNotificationKey] != nil {
let userInfo: NSDictionary = options[UIApplicationLaunchOptionsRemoteNotificationKey] as! NSDictionary
let apsInfo: NSDictionary = userInfo["aps"] as! NSDictionary
//parse notification body message ...
NSNotificationCenter.defaultCenter().postNotificationName(APP_NOTIF_RECEIVE_REMOTE_NOTIF, object: userInfo)
APService.handleRemoteNotification(userInfo as! [NSObject : AnyObject])
//Update badge number
let badgeIndex = apsInfo["badge"] as! Int
UIApplication.sharedApplication().applicationIconBadgeNumber = badgeIndex
}
}
} else if options[UIApplicationLaunchOptionsURLKey] != nil {
if let url = launchOptions?[UIApplicationLaunchOptionsURLKey] as? NSURL {
print(url)
}
}
}
the remaining two cases should be handle in didReceiveRemoteNotification method
//receive apns when app in background mode
let apsInfo: NSDictionary = userInfo["aps"] as! NSDictionary
if UIApplication.sharedApplication().applicationState != UIApplicationState.Active{
//TODO: temporary method, need further update
//judge notification type
if let _ = userInfo["inviterName"] as? String {
//notification for group invite
}else{
//Update badge number
if let badgeInt = apsInfo["badge"] as? Int {
UIApplication.sharedApplication().applicationIconBadgeNumber = badgeInt > 0 ? badgeInt: 1
}else{
UIApplication.sharedApplication().applicationIconBadgeNumber = 1
}
//turn on trigger to enable message hint btn on recorder vc when it appear
NSUserDefaults.standardUserDefaults().setBool(true, forKey: REMOTE_NOTIF_REMAINING)
}
}
//receive apns when app in forground mode
else{
//TODO: temporary method, need further update
//judge notification type
if let _ = userInfo["inviterName"] as? String {
//notification for group invite
NSNotificationCenter.defaultCenter().postNotificationName(APP_NOTIF_RECEIVE_GROUP_NOTIF, object:nil)
}else{
//notificate recorder vc to display message hint directly
NSNotificationCenter.defaultCenter().postNotificationName(APP_NOTIF_RECEIVE_REMOTE_NOTIF, object: userInfo)
}
}
APService.handleRemoteNotification(userInfo)
completionHandler(UIBackgroundFetchResult.NewData)