ios - 如何处理 Could not cast Appdelegate to FIRMessagingDelegate

Question

if #available(iOS 10.0, *) 
{
  // For iOS 10 display notification (sent via APNS)
  UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate

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 as! MessagingDelegate)

Couldn't cast value from Appdelegate to FIRMessagingDelegate

Answer 1

你需要在类行中遵守协议(protocol)

class AppDelegate: UIResponder, UIApplicationDelegate,FIRMessagingDelegate {

因为这个转换 (self as!MessagingDelegate) 会崩溃，然后将其替换为

Messaging.messaging().delegate = self