Re: [swift-evolution] Swift's 'observe()' doesn't work for key paths with optionals?

> On Jul 22, 2017, at 12:12 AM, William Shipley via swift-evolution > wrote: > > submodelObservation = observe(\.controller.submodel) { object, change > in > // code > } > > > @objc dynamic internal var controller: Controller? > > in the

[swift-evolution] Swift's 'observe()' doesn't work for key paths with optionals?

When I try to observe a key path that includes an optional (“controller” in this case) in Swift, I get a compiler error saying ‘Type of expression is ambiguous without more context’ on the backslash in this statement: submodelObservation = observe(\.controller.submodel) { object, change