talks/functional-reactive-intuition/Project/RFP/IntegratedReactiveViewController.swift at 8d283379eac57285a45358c1b42a720789fac1b7 · almostintuitive/talks · GitHub

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//
//  ViewController.swift
//  RFP
//
//  Created by Mark Aron Szulyovszky on 11/01/2016.
//  Copyright © 2016 Mark Aron Szulyovszky. All rights reserved.
//

import UIKit
import RxSwift
import RxCocoa

class IntegratedReactiveViewController: UIViewController, SetStatus, GestureReactorDelegate {

    @IBOutlet weak var draggableView: UIView!
    @IBOutlet weak var statusLabel: UILabel!
    @IBOutlet weak var centerXConstraint: NSLayoutConstraint! //For updating the position of the box when dragging
    @IBOutlet weak var centerYConstraint: NSLayoutConstraint!

    private let pan: UIPanGestureRecognizer
    private let rotate: UIRotationGestureRecognizer
    private var gestureReactor: IntegratedReactiveGestureReactor

    private let disposeBag = DisposeBag()

    required init?(coder aDecoder: NSCoder) {
        pan = UIPanGestureRecognizer()
        rotate = UIRotationGestureRecognizer()

        // workaround to convert ControlEvent<UIGestureRecognizer> to Observable<UIGestureRecognizerType>
        let panObservable: Observable<UIGestureRecognizerType> = pan.rx_event.asObservable().flatMap { gesture -> Observable<UIGestureRecognizerType> in
            return Observable.just(gesture as UIGestureRecognizerType)
        }
        let rotateObservable: Observable<UIGestureRecognizerType> = rotate.rx_event.asObservable().flatMap { gesture -> Observable<UIGestureRecognizerType> in
            return Observable.just(gesture as UIGestureRecognizerType)
        }

        gestureReactor = IntegratedReactiveGestureReactor(timerCreator: { interval in ReactiveTimerFactory.reactiveTimer(interval: interval) }, panGestureObservable: panObservable, rotateGestureObservable: rotateObservable)

        super.init(coder: aDecoder)
    }

    // TODO as we like to have non-optional and non-implicitly-unwrapped properties, we need to execute the setup code in both initializers - unfortunately we can not call instance helper functions here with the current version of swift
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        pan = UIPanGestureRecognizer()
        rotate = UIRotationGestureRecognizer()

        // workaround to convert ControlEvent<UIGestureRecognizer> to Observable<UIGestureRecognizerType>
        let panObservable: Observable<UIGestureRecognizerType> = pan.rx_event.asObservable().flatMap { gesture -> Observable<UIGestureRecognizerType> in
            return Observable.just(gesture as UIGestureRecognizerType)
        }
        let rotateObservable: Observable<UIGestureRecognizerType> = rotate.rx_event.asObservable().flatMap { gesture -> Observable<UIGestureRecognizerType> in
            return Observable.just(gesture as UIGestureRecognizerType)
        }

        gestureReactor = IntegratedReactiveGestureReactor(timerCreator: { interval in ReactiveTimerFactory.reactiveTimer(interval: interval) }, panGestureObservable: panObservable, rotateGestureObservable: rotateObservable)

        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        gestureReactor.delegate = self

        self.draggableView.gestureRecognizers = [pan, rotate]


        ///
        ///
        /// Extra Code to manipulate move and rotate the subview.
        ///
        /// Uses custom infix on CGPoint to '-' or '+' two together.

        let panLocation = pan.rx_event.map { [unowned self] in
            $0.locationInView(self.view) - self.view.center
        }
        panLocation.map { $0.x }
            .bindTo(self.centerXConstraint.rx_constant)
            .addDisposableTo(self.disposeBag)

        panLocation.map { $0.y }
            .bindTo(self.centerYConstraint.rx_constant)
            .addDisposableTo(self.disposeBag)

        rotate.rx_event
            .map { ($0 as! UIRotationGestureRecognizer).rotation }
            .bindTo(self.draggableView.rx_rotate)
            .addDisposableTo(self.disposeBag)
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        self.setStatus("Status: Waiting for Rotate & Pan")
    }

    func didStart() {
        self.setStatus("Started")
    }

    func didTick(secondsLeft: Int) {
        self.setStatus("Tick: \(secondsLeft)")
    }

    func didComplete() {
        self.setStatus("Completed")
    }

}

extension IntegratedReactiveViewController: UIGestureRecognizerDelegate {

    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }

}