How to Fix iOS Code Signing Error

In this tutorial, you'll learn about How to Fix iOS Code Signing Error. We cover key concepts, practical examples, and best practices.

The Problem

You build for distribution or run on a device and get:

Code Signing Error: No signing certificate "iOS Distribution" found

Or:

CodeSign error: code signing is required for product type 'Application'
in SDK 'iOS'

Xcode cannot find a valid signing certificate or provisioning profile for the target bundle identifier.

Quick Fix

Step 1: Check signing settings in Xcode

Target > Signing & Capabilities:

• Ensure Team is selected
• Ensure Bundle Identifier matches the one in App Store Connect
• Check Signing Certificate shows "Apple Development" or "Apple Distribution"

Step 2: Verify certificates in Keychain

security find-identity -v -p codesigning

Expected:

1) A1B2C3D4E5F6 "Apple Development: name@example.com (ABC123)"

If the list is empty, certificates are missing or in the wrong keychain.

Step 3: Download fresh certificates from Apple

1. Go to developer.apple.com > Account > Certificates
2. Revoke the old certificate
3. Create a new one following the CSR workflow
4. Download and double-click the .cer file to add to Keychain

Step 4: Check provisioning profile

ls ~/Library/MobileDevice/Provisioning\ Profiles/

Profiles have .mobileprovision extension. Check expiry:

security cms -D -i ~/Library/MobileDevice/Provisioning\ Profiles/profile.mobileprovision

Expected output includes ExpirationDate in the plist.

Step 5: Re-sign with automatic management

In Xcode, go to Signing & Capabilities, select your team, check Automatically manage signing. Xcode creates and updates profiles for you.

Step 6: Fix keychain access issues

security unlock-keychain ~/Library/Keychains/login.keychain-db

If Xcode says "User interaction is not allowed," update keychain settings:

security set-keychain-settings -t 3600 ~/Library/Keychains/login.keychain-db

Step 7: Verify WWDR intermediate certificate

Download the Apple Worldwide Developer Relations Certificate from Apple's PKI page and install it. An expired WWDR cert breaks all code signing.

Prevention

• Use Automatic Signing in Xcode whenever possible.
• Do not delete expired certificates until new ones are working.
• Back up your private keys in a safe location.

Common Mistakes with code signing

1. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
2. Non-exhaustive pattern matches that compile with warnings then crash at runtime
3. Misunderstanding that String is [Char] with poor performance for large text operations

These mistakes appear frequently in real-world IOS code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

DodaTech Tool Reference

Durga Antivirus Pro can scan provisioning profiles and certificates for anomalies, ensuring they match Apple's expected format and have not been tampered with.