[Swift] Add runtime iOS version to user agent#270
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markmur
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Requesting changes to make sure we don't ship this one without a thorough review of the App Store rules first.
Based on our internal conversation: Apple are likely to block apps identifying the iOS version since pulling the version from their default UA was intentional in the release of iOS 26.
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Stack Context
This PR updates the Swift Checkout Kit user-agent suffix so checkout WebView traffic and Accelerated Checkouts GraphQL traffic include the actual runtime iOS version.
What?
iOSVersion/<UIDevice.current.systemVersion>token to the existingShopifyCheckoutKit/... (iOS;Swift ...)metadata suffix.UserAgentTestsexpected strings to include the dynamic runtime iOS version.Why?
WebKit/Safari can report a frozen built-in iOS user-agent value such as
18_7, which makes iOS 26 traffic difficult to distinguish. Checkout Kit already appends a custom user-agent suffix through the sharedUserAgent.string(...)path, so adding a stable machine-readable token there gives observability the actual runtime iOS version without changing public API.Validation
shadowenv exec --dir /Users/ko/.claudex/worktrees/Shopify@checkout-kit/cx-ios-version-user-agent -- /opt/dev/bin/dev swift test UserAgentTestsshadowenv exec --dir /Users/ko/.claudex/worktrees/Shopify@checkout-kit/cx-ios-version-user-agent -- /opt/dev/bin/dev swift lintshadowenv exec --dir /Users/ko/.claudex/worktrees/Shopify@checkout-kit/cx-ios-version-user-agent -- /opt/dev/bin/dev swift api check