I'm making a chat app using XMPP Framework in swift. What I want to do is whenever a new message is retrieved, the app shows a local notification. I tried to achieve this using NotificationCenter, but apparently it doesn't work as expected. Here's my implementation code:
extension XmppProvider: XMPPStreamDelegate {
...
func xmppStream(_ sender: XMPPStream, didReceive message: XMPPMessage) {
print(message)
// ... code to create a message dictionary goes here ...
// Everytime a message is retrieved, it uses NotificationCenter to show a notification when the app is in background
NotificationCenter.default.post(name: NSNotification.Name("showLocalNotification"), object: messageDictonary)
}
}
And I add an notification observer in my AppDelegate.swift like this:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
...
return true
}
func applicationDidEnterBackground(_ application: UIApplication) {
NotificationCenter.default.addObserver(self, selector: #selector(showLocalChatNotification(_:)), name: NSNotification.Name("showLocalNotification"), object: nil)
}
@objc private func showLocalChatNotification(_ notification: Notification) {
let object = notification.object as! Dictionary<String, String>
let name = object["name"]
let message = object["message"]
let content = UNMutableNotificationContent()
content.title = name!
content.body = message!
content.badge = 1
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false)
let request = UNNotificationRequest(identifier: "localChatNotification", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request) { error in
if let error = error {
print("Local notification error \(error.localizedDescription)")
}
}
}
...
}
Unfortunately it doesn't work as expected, the notification does not show everytime a new message is retrieved. Is there anyway to solve this?
The XMPP is disconnoted when the app on background, If you want to show a notification,You can use APNS or VPNS.The apns can show noti directly，The vpns can wake up you app,Then you can send a local notification.