Software⏱️ 2 min read📅 2026-06-02

How to Fix: "wait_fences: failed to receive reply: 10004003"?

Fix "wait_fences: failed to receive reply: 100040. Use `dispatch_after` or `performSelector. Step-by-step guide included.

Quick Answer: Use `dispatch_after` or `performSelectorDelayedBy:` to delay the code execution until the text field becomes first responder.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The "wait_fences: failed to receive reply: 10004003" error is a known issue in iOS that occurs when a view controller's `viewWillAppear` method is called before the previous view has finished disappearing.

⚠️ Common Causes

  • Calling `becomeFirstResponder` on a text field in `viewWillAppear`: This method requires the previous view to be dismissed before it can be called.

🚀 How to Resolve This Issue

Method 1: Delay the `becomeFirstResponder` Call

  1. Step 1: Move the `[textField becomeFirstResponder];` line to `viewDidAppear:

Method 2: Use a Timer

  1. Step 1: Create a timer that runs after the previous view has finished disappearing, and then call `[textField becomeFirstResponder];` on it.

💡 Conclusion

By making one of these changes, you should be able to resolve the "wait_fences: failed to receive reply: 10004003" error and improve your app's responsiveness.

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