how to change navigationitem title color

The title color of Navigation Bar can be changed in Storyboard.

Go to Attributes inspector of Navigation Controller > Navigation Bar and set the desired color in Title Color menu.

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Add this in your code . .

let textAttributes = [NSForegroundColorAttributeName:UIColor.red]
navigationController?.navigationBar.titleTextAttributes = textAttributes

SWIFT 4:

let textAttributes = [NSAttributedStringKey.foregroundColor:UIColor.red]
navigationController?.navigationBar.titleTextAttributes = textAttributes

SWIFT 4.2+:

let textAttributes = [NSAttributedString.Key.foregroundColor:UIColor.red]
navigationController?.navigationBar.titleTextAttributes = textAttributes

Keeping all the other attributes of the title: If you just want change the color you could do like this:

if var textAttributes = navigationController?.navigationBar.titleTextAttributes {
    textAttributes[NSAttributedString.Key.foregroundColor] = UIColor.red
    navigationController?.navigationBar.titleTextAttributes = textAttributes
}