以下是您可以在playground中运行的代码示例importFoundationclassTempNotifier{varonChange:(Int)->Void={tin}varcurrentTemp=72init(){//1.onChange={[unownedself]tempinself.currentTemp=temp}//2.onChange={[unownedself]tempinself.tempHandler(temp)}//3.unownedlets=selfonChange=s.tempHandler}deinit{println("deinit")}priva