System information (version)

• OpenCV => 4.3 / master
• Operating System / Platform => Mac Catalyst
• Compiler => Xcode 11.4.1

Detailed description

The build_framework.py build scripts for iOS and macOS should be updated to create xcframeworks instead of lipo'd frameworks. This is required in order to support Mac Catalyst, because the iOS simulator x86_64 slice conflicts with the x86_64-apple-ios-macabi slice.

Although there is an existing approach here, ideally it should be resolved in the platform build scripts, and ultimately the official binary releases should be a multi-platform .xcframework instead of a .framework.

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  answers.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc