Apple News预览模拟器故障：加载article.json后频道不可用求助

I’ve run into similar random glitches with Apple News Preview before, so let’s break down the most likely fixes for your issue—especially since the console says the file loaded successfully but the simulator throws that channel error:

• Wipe cache for Simulator and News Preview
  Random issues like this often stem from stale cache. Here’s how to clear it:

  1. Fully close both the Simulator and News Preview app
  2. Open Xcode, go to Window > Devices and Simulators, select your target simulator, and click Erase All Content and Settings
  3. Restart News Preview and re-load your article.json file

• Verify channel ID and metadata consistency
  Even if your JSON worked before, double-check the channelId field in your article.json matches the ID of the test channel you’ve set up in News Preview. Also, scan for subtle metadata issues—like incorrectly formatted datePublished/dateModified fields, or missing optional-but-recommended fields that might now be required in a recent Xcode update. These won’t always trigger console errors but can block channel loading.

• Validate your JSON against Apple’s format rules
  Console success doesn’t guarantee full compliance. Use Xcode’s built-in validator: open your article.json, then go to Editor > Validate Apple News Format. This will catch hidden issues like mismatched data types (e.g., a numeric value wrapped in quotes) or missing mandatory fields that the console might not flag.

• Reset your test channel in News Preview
  Sometimes local test channels get corrupted after system or Xcode updates. Try deleting your existing test channel in News Preview (Settings > Developer > Test Channels), create a new one, update the channelId in your JSON, and reload.

• Check version compatibility
  If you recently updated Xcode or macOS, there might be a mismatch between your JSON’s Apple News Format (ANF) version and what the latest tools expect. Make sure your JSON uses the ANF version supported by your current Xcode release—you can confirm this via Xcode’s internal help documentation.

内容的提问来源于stack exchange，提问作者Moose