A simple implementation of one way binding of property in Swift.

Bindable.swift

class Bindable<Value> {
    typealias Binder = (Value) -> Void

    var binder: Binder?

    var value: Value {
        didSet {
            DispatchQueue.main.async { [weak self] in
                guard let self = self else {
                    return
                }

                self.binder?(self.value)
            }
        }
    }

    init(_ value: Value) {
        self.value = value
    }

    func bind(_ binder: Binder?) {
        self.binder = binder
    }
}