UIKit extensions for adding Reactive Cocoa Support

UIKit+ReactiveCocoa.swift

import UIKit
import ReactiveCocoa

// MARK: - UIControl

extension UIControl {
    func producerForEvent<T where T: UIControl>(controlEvent: UIControlEvents) -> SignalProducer<T, NoError> {
        return self.rac_signalForControlEvents(controlEvent)
            .toSignalProducer()
            .map { (object: AnyObject?) -> T? in
                if let control = object as? T {
                    return control
                }
                
                return nil
            }
            .ignoreNil()
            .flatMap(.Latest) { control in
                return SignalProducer(value: control)
            }
            .flatMapError { error in return SignalProducer<T, NoError>.empty }
    }
}

// MARK: - UIDatePicker

extension UIDatePicker {
    func dateSignal() -> SignalProducer<NSDate, NoError> {
        return self.producerForEvent(.ValueChanged)
            .flatMap(.Latest) { (datePicker: UIDatePicker) in
                return SignalProducer(value: datePicker.date)
            }
        
    }
}

// MARK: - UIRefreshControl

extension UIRefreshControl {
    func refreshingProducer() -> SignalProducer<Bool, NoError> {
        return self.producerForEvent(.ValueChanged)
            .flatMap(.Latest) { (refreshControl: UIRefreshControl) in
                return SignalProducer(value: refreshControl.refreshing)
            }
    }
}

// MARK: - UITextField

extension UITextField {
    func textProducer() -> SignalProducer<String, NoError> {
        return self.rac_textSignal().toSignalProducer()
            .map { object in
                if let string = object as? String {
                    return string
                }
                
                return ""
            }
            .flatMapError { _ in SignalProducer<String, NoError>.empty }
    }
}

extension UITextView {
    func textProducer() -> SignalProducer<String, NoError> {
        return self.rac_textSignal().toSignalProducer()
            .map { object in
                if let string = object as? String {
                    return string
                }
                
                return ""
            }
            .flatMapError { _ in SignalProducer<String, NoError>.empty }
    }
}