293831 2025-05-30 14:51:28 -0700 Crash when using libswiftWebKit APIs in iOS 18.5 simulator 2025-06-05 13:37:56 -0700 1 1 1 Unclassified WebKit WebKit API Other Other iOS 18 RESOLVED FIXED InRadar P2 Normal --- 1 emw emw ap webkit-bug-importer oldest_to_newest 2120795 0 emw 2025-05-30 14:51:28 -0700 Some apps fail to launch in iOS 18.5 simulator with an error that says: ``` Library not loaded: /usr/lib/swift/libswiftWebKit.dylib ``` and later, variations of: ``` tried: '... Build/Products/Debug-iphonesimulator/libswiftWebKit.dylib' (no such file) ``` This happens to apps that have a deployment target of iOS 18.3 or older, and use WebKit APIs which are annotated with NS_REFINED_FOR_SWIFT. These are: ``` WKPDFConfiguration.rect WKWebView.callAsyncJavaScript(_:arguments:in:in:completionHandler:) WKWebView.callAsyncJavaScript(_:arguments:in:contentWorld:) WKWebView.createPDF(configuration:completionHandler:) WKWebView.pdf(configuration:) WKWebView.createWebArchiveData(completionHandler:) WKWebView.evaluateJavaScript(_:in:in:completionHandler:) WKWebView.evaluateJavaScript(_:in:contentWorld:) WKWebView.find(_:configuration:completionHandler:) WKWebView.find(_:configuration:) WKWebsiteDataStore.proxyConfigurations ``` 2120797 1 emw 2025-05-30 14:52:03 -0700 rdar://152200884 2120810 2 emw 2025-05-30 15:16:34 -0700 At this time, there are some workarounds that developers can use for testing and debugging in iOS 18.5 simulator: Option 1: Change your app's deployment target to iOS 18.4 or later. 1. Set `IPHONEOS_DEPLOYMENT_TARGET = 18.4` in build settings, or use Xcode's UI: Select the app's target in a xcodeproj file, then go to General > Minimum Deployments > iOS and set it to 18.4. 2. Rebuild the app. --- Option 2: Set DYLD_FALLBACK_LIBRARY_PATH in the app's run action. This will allow you to test in iOS 18.5 simulator while continuing to deploy to older OS versions. 1. Find the simulator runtime's path using `xcrun simctl list runtimes -v`. It will be a path like "/Library/Developer/CoreSimulator/Volumes/iOS_22F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 18.5.simruntime". 2. Add "Contents/Resources/RuntimeRoot/System/Cryptexes/OS/usr/lib/swift" to this path. 3. In Xcode, navigate to the launch arguments pane of your app's scheme. (Product > Scheme > Edit Scheme > Run > Arguments). Add a "DYLD_FALLBACK_LIBRARY_PATH" environment variable, whose value is the path you computed. It will be something like this: ``` DYLD_FALLBACK_LIBRARY_PATH = /Library/Developer/CoreSimulator/Volumes/iOS_22F77/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 18.5.simruntime/Contents/Resources/RuntimeRoot/System/Cryptexes/OS/usr/lib/swift ``` 4. Run the app (no need to rebuild). 2120820 3 emw 2025-05-30 16:00:23 -0700 Pull request: https://github.com/WebKit/WebKit/pull/46146 2121931 4 ews-feeder 2025-06-05 09:48:26 -0700 Committed 295876@main (d53b778e73ac): <https://commits.webkit.org/295876@main> Reviewed commits have been landed. Closing PR #46146 and removing active labels. 2121959 5 emw 2025-06-05 11:45:01 -0700 Re-opening for pull request https://github.com/apple/WebKit/pull/3150 2121984 6 ews-feeder 2025-06-05 13:37:54 -0700 Committed 289651.558@safari-7621-branch (074e23185bb1): <https://commits.webkit.org/289651.558@safari-7621-branch> Reviewed commits have been landed. Closing PR #3150 and removing active labels.