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HarmonyOS @State Blind to Singleton Tweaks

Toggling a property in a @State singleton? Your HarmonyOS UI stays stubbornly static. Here's the cynical truth and fixes from 20 years of watching frameworks flop.

Sarah Chen 📅 Apr 03, 2026 ⏱️ 3 min read 👁️ 0 views
HarmonyOS ArkUI code showing @State singleton not refreshing UI with toggle example

⚡ Key Takeaways

  • @State skips inner class changes—@Observed or AppStorage required.
  • AppStorage/@StorageLink enables cross-page singleton sync effortlessly.
  • Singletons risk global state pitfalls; HarmonyOS exposes old dev sins.

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Sarah Chen
Written by

Sarah Chen

AI research editor covering LLMs, benchmarks, and the race between frontier labs. Previously at MIT CSAIL.

#@Observed #@State #AppStorage #ArkTS #ArkUI #HarmonyOS #UI Reactivity #state management

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Originally reported by dev.to

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