根据 Apple 指南，您可以在后台和前台状态下获得推送通知，但是当涉及到
终止状态苹果不允许您自动打开应用程序或
进行任何类型的操作，除非您通过通知启动应用程序。
虽然您可以在应用启动时使用启动选项在 Terminated 状态下处理通知。
编码示例：
在您的 AppDelegate.swift 中导入 firebase 库
import Firebase
import FirebaseInstanceID
import FirebaseMessaging
import UserNotifications
每当应用启动注册推送通知服务时，将以下代码行添加到您的 didFinishLaunchingWithOptions 中
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
registerForPushNotifications(application: application)
handleNotificationWhenAppIsKilled(launchOptions)
return true
}
func handleNotificationWhenAppIsKilled(_ launchOptions: [UIApplicationLaunchOptionsKey: Any]?) {
// Check if launched from the remote notification and application is close
if let remoteNotification = launchOptions?[.remoteNotification] as? [AnyHashable : Any] {
// Handle your app navigation accordingly and update the webservice as per information on the app.
}
}
添加appDelegate的扩展方法注册远程通知并从APNS获取设备令牌
//MARK: - Notifications related...
extension AppDelegate {
func registerForPushNotifications(application: UIApplication) {
if #available(iOS 10.0, *) {
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self
let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(
options: authOptions,
completionHandler: {_, _ in })
// For iOS 10 data message (sent via FCM
Messaging.messaging().delegate = self
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
let savedAPNSToken = UserDefaults.standard.object(forKey: "savedAPNSToken") as? String
if savedAPNSToken != token {
UserDefaults.standard.set(token, forKey: "savedAPNSToken")
UserDefaults.standard.synchronize()
Messaging.messaging().apnsToken = deviceToken
}
}
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
print(error.localizedDescription)
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
completionHandler(UIBackgroundFetchResult.newData)
}
}
使用notificationCenter的以下方法来处理前台和后台状态的通知：
// MARK: - UNUserNotificationCenterDelegate
@available(iOS 10, *)
extension AppDelegate : UNUserNotificationCenterDelegate {
// Receive displayed notifications for iOS 10 devices.
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
let userInfo = notification.request.content.userInfo
completionHandler([.alert])
}
/// Handle tap on the notification banner
///
/// - Parameters:
/// - center: Notification Center
/// - response: Notification response
func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: @escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
completionHandler()
}
Firebase 令牌更新：
extension AppDelegate : MessagingDelegate {
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
// Note: This callback is fired at each app startup and whenever a new token is generated.
let savedFCMToken = UserDefaults.standard.object(forKey: "savedFCMToken") as? String
if savedFCMToken != fcmToken {
UserDefaults.standard.set(fcmToken, forKey: "savedFCMToken")
UserDefaults.standard.synchronize()
// Update FCMToken to server by doing API call...
}
}
}