Install XVim2 to use Xcode with vim keybindings. https://github.com/XVimProject/XVim2
Follow the link "You can read the instructions for how to do this and ..." in the README INSTALL.1. https://github.com/XVimProject/XVim2/blob/master/SIGNING_Xcode.md
Open Keychain Access and select "Certificate Assistant> Create Certificate" from the menu bar. Enter as follows. Execute signature from the command line. (Leave it because it takes time. After that, you will be asked to enter the login password several times.)
sudo codesign -f -s XcodeSigner /Applications/Xcode.app
git clone https://github.com/XVimProject/XVim2.git
Switch to a branch that matches your Xcode version. Below is a list of branches. https://github.com/XVimProject/XVim2#branches-and-releases
Here, if the following result is empty, set according to the procedure of README. If the path is displayed like "/Applications/Xcode.app/Contents/Developer", there is no problem.
xcode-select -p
Execute make in the cloned XVim2 directory.
cd XVim2
make
When you start Xcode, the following dialog will be displayed, so select "Load Bundle".
defaults delete com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-12.0.1
Close Xcode and restart it. If successful, the cursor will become a block type as shown below, and you can operate it with Vim key bindings.
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