Adam and Xiaodi have it correct, and it’s always possible to get the effect you want by adding an overridable method to mySuperClass (something like ‘defaultStatement()’).
8:43 AM
とはいえコメントの意図としては class Base { func getDefaultFooX() -> Int { return 12 } func foo(x: Int? = nil) { let x = x ?? getDefaultFooX() print(x) } } class Derived : Base { override func getDefaultFooX() -> Int { return 42 } } という事なのでしょうね。(edited)
