You can use emacs + lsp along with the Xcode lsp server. works great and is way more stable the XCode. I just use XCode for storyboard editing.

(add-to-list 'exec-path "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin")

(use-package lsp-sourcekit :ensure t :after lsp-mode :config (setq lsp-sourcekit-executable "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/sourcekit-lsp"))

(use-package swift-mode :hook (swift-mode . (lambda () (lsp))))