Extract self-properties in block-method - swift

Question

I have some trouble in understanding my specific request, in Swift.
There is a class named Origin and multiple its subclasses.
How I can update my block-method written ONLY in Origin class?
class Origin: NSObject {
func mod(_ block: (() throws -> Void)) {
try! block()
}
}
I need use mod from all Origin subclasses, and I need to have this usage effect:
var originSubclassObject = OriginSubclass()
originSubclassObject.mod {
.age = 12 //age is OriginSubclass property
.name = "Bob" //name is OriginSubclass property
}
So, you see, I need extract OriginSubclass properties for using in mod-block. I need to create usage exactly likes in usage effect code (extract mod-caller properties from ".").
Thanks all for help!

Answer 1

You could consider a protocol with a default implementation, e.g.:
protocol Modifiable { }
extension Modifiable {
func mod(_ block: ((Self) throws -> Void)) {
try! block(self)
}
}
class Origin: Modifiable { }
class OriginSubclass: Origin {
var name: String?
var age: Int?
}
And then:
let originSubclassObject = OriginSubclass()
originSubclassObject.mod { object in
object.age = 12
object.name = "Bob"
}
Or
let originSubclassObject = OriginSubclass()
originSubclassObject.mod {
$0.age = 12
$0.name = "Bob"
}
Or, if that base class was only there for the mod method, you could lose it entirely:
protocol Modifiable { }
extension Modifiable {
func mod(_ block: ((Self) throws -> Void)) {
try! block(self)
}
}
class MyObject: Modifiable {
var name: String?
var age: Int?
}
And
let myObject = MyObject()
myObject.mod { object in
object.age = 12
object.name = "Bob"
}
Or
let myObject = MyObject()
myObject.mod {
$0.age = 12
$0.name = "Bob"
}