Method swizzling in Firebase Cloud Messaging
Developers who prefer not to use swizzling can disable it by adding the flag FirebaseAppDelegateProxyEnabled in the app's Info. plist file and setting it to NO (boolean value).
What is method swizzling in IOS?
Method Swizzling is the ability to change the functionality of an existing selector/method at runtime.
How do I enable swizzling in IOS?
Check your info. plist file. Please check key FirebaseAppDelegateProxyEnabled is set to NO then method swizzling is disabled. If you have disabled swizzling by setting FirebaseAppDelegateProxyEnabled to NO in your app's Info.
