Swift Nested Calling

Question

class BFCommon {
    class BFUser {

    }

    extension BFUser {
        static func sayHello() {
            print("Hello")
        }
    }
}

BFCommon.BFUser.sayHello

Need help fixing my code to call a function like so.

BFCommon.BFUser.sayHello

Answer 1

Exactly as the error message suggests, extensions can only be declared at the file scope:

class BFCommon {
    class BFUser {}
}

extension BFCommon.BFUser {
    static func sayHello() {
        print("Hello")
    }
}

BFCommon.BFUser.sayHello()