CODEWITHSUNDEEP
swiftinheritanceinner-classes
Colateral
Colateral

Reputation: 1801

Swift Inheritance nested/inner enum issue

I am coming from java/C++/C# to Swift. I have the following issue:

class A {

    struct Fields{
      static let valA = "A";
    }
}

class B: A {

    struct Fields{
      static let valB = "B";
      static let valD = "D";
    }
}

var b: B = B()
println("\(B.Fields.valB)")

The compiler is complaining that "Class A.Fields.Type has no member named "valB".

I need to keep the same enum name (eq. Fields) on both classes.

Thank you,

Upvotes: 1

Views: 1526

Answers (1)

Daniel Krom
Daniel Krom

Reputation: 10058

instead of struct, make it class

class A {

    class Fields{
        static let valA = "A";
    }
}

class B: A { //<--Doesn't have to extend A 

    class Fields : A.Fields{
        static let valB = "B";
        static let valD = "D";
    }
}


println(B.Fields.valA)//A
println(B.Fields.valB)//B
println(B.Fields.valD)//D

edit: why class and not struct? struct can't be inherited 

struct A{
    var a : Int?;
}

struct B :A{
    var b : Int;
}

this will generate compile error

Inheritance from non-protocol type 'A'

only classes can be inherited and only classes can extend other classes. this code will also generate compile error: 

class A{
    var e : Int?;
}

struct B :A{
    var t : Int;
}

Non-class type 'B' cannot inherit from class 'A'

dont forget that structs comes from C language, which is not object oriented.

Upvotes: 1

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