I hate that Xcode doesn’t include a duplicate line shortcut. I have to keep adding it in every time a new version of Xcode comes out and every time, I have to Google it, so I’m pasting the SO post here that worked most recently. There must be a better way, but until I figure that out, here’s what has worked for me.
<key>Custom Commands</key> <dict> <key>Cut Current Line</key> <string>selectLine:, cut:</string> <key>Copy Current Line</key> <string>selectLine:, copy:</string> <key>Duplicate Current Line</key> <string>selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:</string> </dict>
Then restart Xcode and go to Preferences -> Key Bindings and assign your shortcuts.
This was taken from: https://stackoverflow.com/a/41579618
Didn’t work for me in Xcode 9—now seems to be /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources/IDETextKeyBindingSet.plist
Also I found
Duplicate Current Line
moveToEndOfLine:, moveToBeginningOfLineAndModifySelection:, copy:, moveToEndOfLine:, insertNewline:, paste:, insertNewline:
to be better because it doesn’t include this weird newline (on my machine).
This version is better for me:
selectLine:, copy:, paste:, paste:, moveUp:, moveToEndOfLine:
The best version of duplicate current line is below, because it doesn’t crush your your current clipboard data:
moveToBeginningOfLine:, deleteToEndOfLine:, yank:, insertNewline:, moveToBeginningOfLine:, yank: