It seems that in iOS 18.5+ built with Xcode 16.4+, there has been a breaking change since 18.4 with 16.3 within WebKit and how the navigationAction.sourceFrame property is initialized when implementing the decidePolicy delegate method.
The flow goes:
Implement a WKNavigationActionDelegate with decidePolicy
Call WKWebView.loadHTMLString("some-string", baseURL: nil)
Upon loading the HTML content, read the value of navigationAction.sourceFrame within the decidePolicy method of the WKNavigationActionDelegate
On iOS 18.4 (and below) with Xcode 16.3 (and below);
navigationAction.sourceFrame is <uninitialized>
On iOS 18.5+ with Xcode 16.4+:
navigationAction.sourceFrame is already initialized and is equal to navigationAction.targetFrame
It appears that this change was made between minor versions of Xcode and is unexpected behavior of a minor version. Not only was this not called out in the release notes for Xcode 16.4 and iOS 18.5, but it's technically also a breaking change to the WebKit API.
Can we get insight on why this change was made and what Apple's policy is on breaking changes between minor versions of Xcode/iOS?
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