RxSwiftでUIViewControllerのライフサイクルを扱う

[HAKASHUN]

やり方は2パターンあります。

[HAKASHUN]

パターン1

参考

【RxSwift】viewWillAppear等が呼ばれた時のトリガーを作ってみる

実装

class SampleViewController: UIViewController {
    private func trigger(selector: Selector) -> Observable<Void> {
        return rx_sentMessage(selector).map { _ in () }.shareReplay(1)
    }
    var viewWillAppearTrigger: Observable<Void> {
        return trigger(#selector(self.viewWillAppear(_:)))
    }
    var viewDidAppearTrigger: Observable<Void> {
        return trigger(#selector(self.viewDidAppear(_:)))
    }
    var viewWillDisappearTrigger: Observable<Void> {
        return trigger(#selector(self.viewWillDisappear(_:)))
    }
    var viewDidDisappearTrigger: Observable<Void> {
        return trigger(#selector(self.viewDidDisappear(_:)))
    }
    private let disposeBag = DisposeBag()

    func viewDidLoad() {
        super.viewDidLoad()
        viewWillAppearTrigger
            .skip(1) //初回はスキップ
            .subscribeNext { _ in
                print("viewWillAppear")
            }
            .addDisposableTo(disposeBag)
    }
}

[HAKASHUN]

パターン2

参考

CoderKingdom/RxMarvelHeros

実装

class SampleViewController: UIViewController {
    let rx_viewWillAppear:Observable<Void> = PublishSubject()
    let rx_viewDidAppear:Observable<Void> = PublishSubject()
    let rx_viewWillDisappear:Observable<Void> = PublishSubject()
    let rx_viewDidDisappear:Observable<Void> = PublishSubject()
    private let disposeBag = DisposeBag()

   override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    (rx_viewWillAppear as? PublishSubject)?.on(.Next())
    }
   override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
    (rx_viewDidAppear as? PublishSubject)?.on(.Next())
    }
   override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
        (rx_viewWillAppear as? PublishSubject)?.on(.Next())
    }
    override func viewDidDisappear(animated: Bool) {
        super.viewDidDisappear(animated)
    }
    func viewDidLoad() {
        super.viewDidLoad()
        rx_viewWillAppear
            .skip(1) //初回はスキップ
            .subscribeNext { _ in
                print("viewWillAppear")
            }
            .addDisposableTo(disposeBag)
    }
}