Emitter UI refresh failure issue

Read the original article：Emitter UI refresh failure issue Problem Description When using the emitter, subscription and unsubscription are encapsulated inside a class and called through new instances. After subscribing, when the emitter event is triggered and parameters change, the UI does not refresh as expected. Background Knowledge Emitter : Event handling mechanism in HarmonyOS for intra-thread or inter-process communication. Subscription : Register callbacks to listen for events. Publishing : Trigger events to notify subscribers. Unsubscription : Stop listening to free resources. Use cases : Useful for event handling across threads or when UI needs to react to state changes. State management in ArkTS : Properties must be wrapped by state decorators ( @State , @ObservedV2 , @Trace ) or reassigned after constructor execution to trigger UI updates. Troubleshooting Process Checked whether the this context inside arrow functions is correctly bound. Verified whether state variables are