Trim trailing spaces in Xcode

I find using the new Automatically trim trailing whitespace -> Including whitespace-only lines as suggested by @MartinStolz works well while editing but I sometimes need to do Cmd + a -> Ctrl + i and save the file multiple times with the file in focus when I'm not editing.

In case you want to clean a whole project (excluding .md files) without using scripts, you can also do a Find & Replace -> Regular Expression. Since this technique removes trailing space and tabs for documentation/comments as well, you can also try a negative lookahead for blacklisted characters to filter out single-line comments.

Find all trailing whitespace:

[\t ]+$

Find trailing whitespace without touching single-line comments:

^(?!.*\\\\)[\t ]+$

Replace:

<nothing>

So linting can also be done without swiftlint autocorrect or similar third party solutions.

The best and easy way without using scripts, hacks and much more. Just go to Find And Replace and press alt/option + space and press space button in the replace bar and then click on replace all. It will replace the whitespaces with normal spaces and the warning/ error will be gone !!