Search code examples
swiftswift-playgroundkvcswift4

Swift 4 new KVC

I am trying to understand latest addition to Swift 4 - better KVC. Having this simple stuff in playground prints out nothing

class Foo {
    var name: String
    init(name: String) {
        self.name = name
    }
}

class Bar {

    var fooObject: Foo = Foo(name: "FooName")
    var keyPath = \Foo.name

    func output() {
        print(fooObject[keyPath: keyPath])
    }
}

let bar = Bar()
bar.output()

Although, it works if you make a small change and try to output this: 

print(fooObject[keyPath: \Foo.name])

Can someone explain? Is it still buggy or am I just doing something stupid here? Thanks.

Solution

  • You need to update to Xcode 9 beta 4, where it is fixed.