Access properties via subscripting in Swift

Question

I have a custom class in Swift and I\'d like to use subscripting to access its properties, is this possible?

What I want is something like this:

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Answer 1

Shim's answer above doesn't work anymore in Swift 4. There are two things you should be aware of.

First of all, if you want to use value(forKey:) function, your class must inherit NSObject.

Secondly, since Objective-C doesn't know anything about value type, you have to put the @objc keyword in front of your value type properties and Swift will do the heavy-lifting for you.

Here is the example:

import Foundation

class Person: NSObject {
    @objc var name: String = "John Dow"
    @objc var age: Int = 25
    @objc var height: Int = 180

    subscript(key: String) -> Any? {
        return self.value(forKey: key)
    }
}

let person: Person = Person()

person["name"] // "John Dow"
person["age"] // 25
person["height"] // 180