问题
I have some error like this "Expression implicitly coerced from String? to Any" this is my code :
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
FIRApp.configure()
FIRAuth.auth()?.signIn(withEmail: "myemail@gmail.com", password: "mypassword", completion: { (user, error) in
if (error != nil) {
print(user?.email)
}else {
print(error?.localizedDescription)
}
})
return true
}
Error in this line
print(user?.email)
And
print(error?.localizedDescription)
Please help me
回答1:
The print function requires a set of Any parameters. String is a Any. In this case Xcode is telling you that it implicitly coerced the optional string into an Any object (by transforming the String value in Optional(value)).
To avoid this warning, you can simply use a default value or unwrap the String?
print(user?.email ?? "User instance is nil")
print(user!.email)
来源：https://stackoverflow.com/questions/40691184/expression-implicitly-coerced-from-string-to-any