Multi-line comments in Xcode

Xcode Version 6.1

Shortcuts:

To Comment: Select the code to be comment, ⌘ + /

To uncomment: Select the code an press ⌘ + /

Also see taskbar Editor>Structure "(un)Comment Selection" as user 2137640 pointed out.

Command + Shift + 7

Command + /

This inserts // in front of every selected line.

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