我想监控watch电池状态,所以我像这样为电池状态添加了KVOprivatefuncsetupNotification(){WKInterfaceDevice.current().addObserver(self,forKeyPath:#keyPath(WKInterfaceDevice.batteryState),options:[.new],context:nil)}overridepublicfuncobserveValue(forKeyPathkeyPath:String?,ofobject:Any?,change:[NSKeyValueChangeKey:Any]?,cont