Is there a way to make observable enum in Swift (KVO)

Question

I'm trying to use RxSwift for binding in MVVM. I have a Enum:

enum Color : Int {
    case Red = 0, Green
}

and class for test

class Test : NSObject {
    var color: Color = .Red
    dynamic var test: String? {
        didSet {
            print("didSet \(test)")
        }
    }
}

And want to observe changes like:

test.rx_observe(Color.self, "color").subscribeNext { (color) -> Void in
     print("Observer \(color)")
}.addDisposableTo(bag)

But the program chashes with *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ addObserver: forKeyPath:@"color" options:5 context:0x0] was sent to an object that is not KVC-compliant for the "color" property.'

Code for simple String works:

test.rx_observe(String.self, "test").subscribeNext { string in
     print("Observer \(string)")
}.addDisposableTo(bag)

test.test = "1"
test.test = "2"

I found here that to make class inherited not from NSObject I should make it dynamic, but I can't make Enum dynamic. Is there a way to make Enum observable?

Is there a way to make observable enum in Swift (KVO)

3 Answers