NSItemProvider+rx.swift

extension Reactive where Base: NSItemProvider {

    func loadObject<T: NSItemProviderReading>(of type: T.Type) -> Single<T> {
        Single.create { single in
            self.base.loadObject(ofClass: type) { reading, error in
                if let error = error {
                    single(.error(error))
                } else if let object = reading as? T {
                    single(.success(object))
                } else {
                    single(.error(NSError(
                        domain: NSItemProvider.errorDomain,
                        code: NSItemProvider.ErrorCode.unknownError.rawValue
                    )))
                }
            }

            return Disposables.create()
        }
    }
}