Reactive cocoa in swift 3/4

ReactiveQuickHelp.swift

//Always import
import ReactiveCocoa //Cocoa extensions
import ReactiveSwift //primitives

//Acces UI extensions with .reactive

self.textField.reactive.

//A text listener in a textfield
// self.reactive.lifetime will make the listener to expire on dealloc

self.textField.reactive.continuousTextValues.skip(first: 1).take(during: self.reactive.lifetime).observeValues { [weak self]text in
            guard let myText = text, let this = self else { return }
        }

//listen for notifications

NotificationCenter.default.reactive.notifications(forName: NSNotification.Name.UIKeyboardDidShow).take(during: self.reactive.lifetime).observe { [weak self]notification in
            guard let this = self else { return }
             //use the notification                                                                                                                                   
}

//an Action on a button

self.closeButton.reactive.pressed = CocoaAction(Action<Void,Void,NoError> { [weak self] () in
            self?.close()
            return SignalProducer.empty
        })

//listen to a property in an object
let property = DynamicProperty<String?>(object: person,
                                       keyPath: #keyPath(person.name))

property.signal.skipNil().take(during: self.lifetime).observeValues { name in
                                                                       
}

//Mutable property
let mutableProperty = MutableProperty<Object?>(nil)
mutableProperty.value = Object()

mutableProperty.signal.skipNil().take(during: self.lifetime).observeValues { value in
                                                                       
}

//SignalProducer

let a = MutableProperty<String>("")
let b = MutableProperty<String>("")
let c = MutableProperty<String>("")

var disposable = SignalProducer.combineLatest(a.producer, b.producer, c.producer)
    .startWithValues { aVal, bVal, cVal in
        print("combined producer = \(aVal + bVal + cVal)")
    }