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 being trac