Passing an Objective-C protocol to an objective-C function in Swift?

[Kyle-Ye (Kyle)]

The 2 posts may help solve your problem.

Swift metatype and ObjectiveC Protocol question

We have an ObjC API which receive a Protocol instance and return Any?. // Imported ObjectiveC API func resolve(_ p: Protocol) -> Any? // Swift Side Code @objc protocol P: NSObjectProtocol { func hello() } func test() { let p = resolve(P.self) as? P p?.hello() } In Swift side, we'd like to wrap the API to make it more swift-friendly. func resolve2<T>(_ t: T.Type) -> T? { return resolve(t) as? T // return resolve(t.self) as? T // return resolve(T.self) as? T // …

What's .self, .Type and .Protocol? Understanding Swift Metatypes