Being a heavy Eclipse user, I’ve grown accustomed to its keyboard shortcuts for moving and copying lines of text. Xcode doesn’t have a regular editing command for this, but it does offer similar functionality via user scripts. The Move Line Up and Move Line Down scripts are already there, just waiting for you to bind keys to them. Go to the script menu, which is to the left of the Help menu, and select the Edit User Scripts… menu item. Expand the disclosure triangle next to Text, and you can set keyboard shortcuts by double-clicking in the column to the right of the script names. Below is a screenshot of what the dialog will look like if you follow all of the instructions in this post.