How to get smart tabs (“indent with tabs, align with spaces”) behavior in Xcode?

Question

I used to use tabs for indentation and spaces for alignment. Like so (arrows show tabs and dots show spaces).

Answer 1

In Xcode > Preferences (⌘,):

If I understand your question correctly, this should do it for you.

Answer 2

In XCode
Xcode > Preferences or use ⌘ , to open Preferences
now click on the Text Edit tab and then there is sub tab bar click on Indentation and you can change setting of the Indentation as you need

Answer 3

If you want to remap the standard Xcode's ⌘+[ to TAB, you can do the following:

1. Install a program called "Karabiner".

2. Go to Preferences ~> "Misc and Uninstall"

3. In "Custom Setting" section click on the "Open private.xml" button

4. Open the file and replace its content with the following code:

   <?xml version="1.0"?> 
   <root>
       <item>
           <name>Tab instead of Command+[</name>
           <identifier>private.swap_tab_and_cmnd+[</identifier>
           <autogen>
               __KeyToKey__
               KeyCode::TAB, ModifierFlag::NONE,
               KeyCode::BRACKET_RIGHT, ModifierFlag::COMMAND_L | ModifierFlag::NONE
           </autogen>
       </item> 
   </root>
   

5. Go to Preferences ~> "Change Key" ~> click on "Reload XML" button

6. Put a tick in the checkbox which is called "Tab instead of Command+["

7. Enjoy

PS: Please note that this setting works globally on your machine, not just in Xcode. However, I am sure that google might help you to find a solution how to customize it even further, applying the changes only to Xcode.