iOS SDK 26

Last reviewed Sep 12, 2026

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Prompt Details

Prompt Composition

2prompts
  1. Swift 6.3121 lines · 4.3K tokens
  2. iOS SDK 2656 lines · 1.5K tokens
Total177 lines · 5.8K tokens

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Prompt Preview

Apply the Swift 6.3 baseline first. These rules cover iOS SDK 26 Keychain, data protection, networking, authentication, URL handling, web views, permissions, interprocess sharing, logging, entitlements, signing, and release.

Keychain and protected storage

  • Store credentials with SecItemAdd using the narrowest kSecAttrAccessible class and access group; choose ThisDeviceOnly to prevent migration to another device, and kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly when backup must also be excluded and a device passcode is required.
  • Build SecAccessControl with .userPresence or .biometryCurrentSet for step-up keys; .biometryAny survives enrollment changes and has a different trust boundary.
  • Set FileProtectionType.complete or, only when access through an already-open file while locked is necessary, completeUnlessOpen explicitly for sensitive files and exclude credentials and unnecessary personal data from backup.
  • Keep sensitive values out of UserDefaults, caches, pasteboard, screenshots, notifications, and unprotected app-group storage. Obscure sensitive scene content before sceneDidEnterBackground(_:) returns to protect app-switcher snapshots.
  • Bind persisted data to the correct account and tenant and delete it on logout, revocation, or retention expiry.

Networking and trust

  • Keep App Transport Security enabled and scope NSExceptionDomains to documented fixed hosts; never use NSAllowsArbitraryLoads as a production workaround.
  • Require authenticated TLS 1.2 or later for sensitive Network/CFNetwork connections because ATS does not