Use of unresolved operator '<~'
问题 I am using ReactiveCocoa 5.0 alpha 3, ReactiveSwift and Swift 3 I am having issues with binding my UITextField to a MutableProperty. In ReactiveCocoa 4, I used this:- extension UITextField { func signalProducer() -> SignalProducer<String, NoError> { return self.rac_textSignal().toSignalProducer() .map { $0 as! String } .flatMapError { _ in return SignalProducer<String, NoError>.empty } } } viewModel.email <~ emailTextField.signalProducer() But now in ReactiveCocoa 5, I am not able to do that.