[Swift] Updates accelerated checkouts to use onDismiss

[kiftio]

What changes are you making?

Renames the onCancel / checkoutDidCancel API to onDismiss / checkoutDidDismiss across the Swift platform to better reflect the intent of the callback. "Cancel" implied the buyer actively abandoned the checkout, whereas "dismiss" more accurately describes the action of closing the checkout experience regardless of the reason.

This is a breaking API change that affects:

• The AcceleratedCheckoutButtons.onCancel(_:) view modifier, renamed to onDismiss(_:)
• The EventHandlers.checkoutDidCancel property, renamed to checkoutDidDismiss
• The ApplePayViewController.onCheckoutCancel property, renamed to onCheckoutDismiss
• All sample apps and tests updated to reflect the new naming

How to test

1. Integrate AcceleratedCheckoutButtons into a SwiftUI view and attach the .onDismiss { } modifier.
2. Trigger a checkout flow and dismiss the checkout sheet without completing the purchase.
3. Confirm the onDismiss closure is invoked and the previous onCancel modifier is no longer available.
4. Run the full test suite to confirm all renamed callback tests pass.

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Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

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Releasing a new Swift version?

• I have bumped the version in ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Embedded Checkout Protocol version?

• I have bumped embeddedCheckoutProtocolAndroid in platforms/android/gradle/libs.versions.toml
• I have updated protocol/languages/kotlin/embedded-checkout-protocol/api/embedded-checkout-protocol.api if the public API changed

Releasing a new Android version?

• I have bumped checkoutKitAndroid in platforms/android/gradle/libs.versions.toml
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[kiftio]

• [ReactNative] Rename oncancel to ondismiss in swift and android #483
• [Swift] Updates accelerated checkouts to use onDismiss #486 👈 (View in Graphite)
• [Android][Swift] Rename oncancel to ondismiss in swift and android #482
• main

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React Native — Coverage Report

Lines	Statements	Branches	Functions
	91.85% (327/356)	87.98% (183/208)	100% (86/86)

[bitrise]

Install this build

Open Tophat, select your target device, then click Install. Links open on the Mac running Tophat.

SDK	Install
Swift	Install with Tophat

Checkout Kit E2E results

Status	Suite	Target	Platform	OS version tag	Device
✅	tests/shared/launch-smoke.yaml	swift	ios	latest	iPhone 15 iOS 27 Beta

[kiftio]

Merge activity

• Jul 17, 4:08 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 17, 4:10 PM UTC: Graphite rebased this pull request as part of a merge.
• Jul 17, 4:26 PM UTC: @kiftio merged this pull request with Graphite.