Use Xcode 13.3 on macOS Big Sur

README.md

Xcode 13.3 required macOS 12.0 or later, but with this tips you can use it on a macOS 11 (11.6.1 for me). Xcode 13.2.1 should be installed anyway (/Applications/Xcode.app).

Install Xcode 13.3 on macOS Big Sur

1. Download Xcode 13.3 from Apple Developer Portal;
2. Unpack it and move to /Applications;
3. Right click on Xcode_13.3.app and select Show Package Contents;
4. Open Contents/Info.plist;
5. Set your current macOS version to Minimum system version (I just set 11.0).

Now you can open Xcode_13.3 and compile and run basic projects on an iOS Simulator 15.4 🎉

Issues:

Cocoapods

If you use CoreData models or Frameworks in pods some scripts will fail with errors:

xcrun momc ...
Executable requires at least macOS 12.0, but is being run on macOS 11.6.1, and so is exiting.

/usr/bin/codesign ...
Executable requires at least macOS 12.0, but is being run on macOS 11.6.1, and so is exiting.

For fix it I just replace DEVELOPER_DIR to Xcode 13.2.1 path:

1. Add post_install phase in Podfile;
2. Insert this:

override_developer_dir = eval(Net::HTTP.get(URI('https://gist.githubusercontent.com/rock88/a88798572fc128e08d51b8d2c85759e2/raw/override_developer_dir.rb')))
override_developer_dir(__dir__)

Full part of Podfile:

post_install do |installer|
  override_developer_dir = eval(Net::HTTP.get(URI('https://gist.githubusercontent.com/rock88/a88798572fc128e08d51b8d2c85759e2/raw/override_developer_dir.rb')))
  override_developer_dir(__dir__)
end

If you not preffer to download override_developer_dir.rb on each pod install you can copy/paste override_developer_dir to your Podfile.

3. Run pod install.

Script will open each *.sh file from Pods/Target Support Files/Pods-* and set DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer ENV var. So all Cocoapods scripts should run normally.

override_developer_dir.rb

def override_developer_dir(root_dir)
  override = "DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer"

  for path in Dir["#{root_dir}/Pods/Target Support Files/Pods-*/*.sh"]
    lines = File.read(path).split("\n")
    if lines[2] != override
      lines.insert(1, "\n#{override}\n")
      File.write(path, lines.join("\n"))
      puts "[!] Override DEVELOPER_DIR in #{File.basename(path)}".yellow
    end
  end
end