gothedistance https://blog.hatena.ne.jp/gothedistance/ Life is Really Short, Have Your Life!! https://aroundthedistance.hatenadiary.jp/ Swift The Swift Programming Language: Propertiesよりこれは簡単でびっくりだ。C#のPropertyChangedよりもイケてる仕組みだと思う。 class StepCounter { var totalSteps: Int = 0 { willSet(newTotalSteps) { println("About to set totalSteps to \(newTotalSteps)") } didSet { if totalSteps > oldValue { println("Added \(totalSteps - oldValue) steps"… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Faroundthedistance.hatenadiary.jp%2Fentry%2F2014%2F11%2F12%2F180718" title="swiftだと簡単にプロパティの監視が出来る件 - Life is Really Short, Have Your Life!!" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2014-11-12 18:07:18 rich https://aroundthedistance.hatenadiary.jp/entry/2014/11/12/180718 1.0 100%