Hitting cmd+opt+/ in Xcode while the cursor is on a type or function declaration will generate a quick help documentation for you. E.g.

With a function like this:

func foo(name: String) -> Int {}

This is generated:

/// Description
///
/// - Parameter name: name description
/// - Returns: return value description

Works with both Swift and Obj-C.

PS: This shortcut might already be used by another app. E.g. Alfred uses this for one of it's shortcuts. It's available via Editor > Structure > Add Documentation, so you can reassign a different shortcut.

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