XCFramework requires to target iOS 13 for inter-framework dependencies with Objective-C compatibility (tested with Xcode 11 beta 7)

There are two issues when using XCFramework for inter-framework dependencies with Objective-C compatibility which did not cause any problems when creating normal frameworks. It seems that the XCFramework issues can only be resolved when targeting iOS 13.0.

It would be quite convenient to have these issues resolved in order to distribute libraries compiled and bundled as XCFrameworks without sacrificing backwards compatibility for any iOS version older than iOS 13.

In order to demonstrate the two issues just build the DerivedFramework target with Xcode 11.0. The sample project can be found here: https://github.com/schiewe/XCFrameworkIssue

Issue 1) https://github.com/schiewe/XCFrameworkIssue/blob/f84ec25145f63f93badbe845a282bb21e18967eb/DerivedFramework/DerivedClass.swift#L8 causes a Method cannot be marked @objc because the type of the parameter cannot be represented in Objective-C error.

Issue 2) https://github.com/schiewe/XCFrameworkIssue/blob/f84ec25145f63f93badbe845a282bb21e18967eb/DerivedFramework/DerivedClass.swift#L15 causes a '@objc' instance method in extension of subclass of 'BaseClass' requires iOS 13.0.0 error.

It seems like these issues are compiler bugs which will hopefully be fixed but it might also be a "feature".
What do you think?

1 Like

Xcode 11 GM Seed yields the same issues.

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