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Swiftでプロパティ監視(KVO)

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プロパティを監視して、変更があった場合にイベントを受け取る仕組みがSwiftにはあって、Key Value Observing(KVO)と呼ぶらしい。

監視対象に自身を登録

hoge.addObserver(self, forKeyPath: "name", options: .New, context: nil)

プロパティ変更ハンドラ

override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
    // ここで処理を行う
}

監視を削除

hoge.removeObserver(self, forKeyPath: "name")

jsなどのaddEventListenerと使い方は似ています

kwst
Front Engineer
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