Class Declaration in Final Class

Class methods and properties in final classes should themselves be final, just as if the declarations are private. In both cases, they cannot be overridden. Using final class or static makes this explicit.

• Identifier: non_overridable_class_declaration
• Enabled by default: No
• Supports autocorrection: Yes
• Kind: style
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning
  final_class_modifier	final class

Non Triggering Examples

final class C {
    final class var b: Bool { true }
    final class func f() {}
}

class C {
    final class var b: Bool { true }
    final class func f() {}
}

class C {
    class var b: Bool { true }
    class func f() {}
}

class C {
    static var b: Bool { true }
    static func f() {}
}

final class C {
    static var b: Bool { true }
    static func f() {}
}

final class C {
    class D {
        class var b: Bool { true }
        class func f() {}
    }
}

Triggering Examples

final class C {
    ↓class var b: Bool { true }
    ↓class func f() {}
}

class C {
    final class D {
        ↓class var b: Bool { true }
        ↓class func f() {}
    }
}

class C {
    private ↓class var b: Bool { true }
    private ↓class func f() {}
}