XCode : How to use cmd + x to either cut the current line (if no text is selected) or cut the selected text
That is correct. (Xcode 10)


Add the entry for cut line and copy line in the IDETextKeyBindingSet.plist file
Save the IDETextKeyBindingSet.plist
Restart Xcode
Set a key for the new command through xcode > preferences > key bindings > My Custom Commands
Resolve conflicts




Example: /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/IDETextKeyBindingSet.plist

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;dict&gt;
    &lt;key&gt;Cut and Copy&lt;/key&gt;
    &lt;dict&gt;
        &lt;key&gt;Cut Current Line&lt;/key&gt;
        &lt;string&gt;selectLine:, cut:&lt;/string&gt;
        &lt;key&gt;Copy Current Line&lt;/key&gt;
        &lt;string&gt;selectLine:, copy:&lt;/string&gt;
    &lt;/dict&gt;
    &lt;key&gt;Duplication&lt;/key&gt;
    &lt;dict&gt;
        &lt;key&gt;Duplicate Current Line&lt;/key&gt;
        &lt;string&gt;moveToBeginningOfLine:, deleteToEndOfLine:, yank:, insertNewline:, moveToBeginningOfLine:, yank:&lt;/string&gt;
        &lt;key&gt;Duplicate Lines&lt;/key&gt;
        &lt;string&gt;selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:&lt;/string&gt;
        &lt;key&gt;Delete Line&lt;/key&gt;
        &lt;string&gt;selectLine:, deleteBackward:&lt;/string&gt;
    &lt;/dict&gt;
&lt;/dict&gt;
&lt;/plist&gt;


Xcode keybinding (Cut and Copy):


Xcode conflict resolve (Cut and Copy):