iOS 10 adds the UNUserNotificationCenterDelegate
protocol for handling notifications while your app is in the foreground.
The
UNUserNotificationCenterDelegate
protocol defines methods for receiving notifications and for handling actions. When your app is in the foreground, arriving notifications are delivered to your delegate object instead of displayed automatically using the system interfaces.
Swift:
optional func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
Objective-C:
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler;
The UNNotificationPresentationOptions flags allow you to specify UNNotificationPresentationOptionAlert
to display an alert using the text provided by the notification.
This is key as it allows you to display the alert while your app is open and in the foreground, which is new for iOS 10.
Sample code:
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Set UNUserNotificationCenterDelegate
UNUserNotificationCenter.current().delegate = self
return true
}
}
// Conform to UNUserNotificationCenterDelegate
extension AppDelegate: UNUserNotificationCenterDelegate {
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
completionHandler(.alert)
}
}