In objective-c I can just say the following.
[self.promoTextField setKeyboardType:UIKeyboardTypeEmailAddress];
I tried googling it but just ge
In Swift 3 you might use:
Swift 3
youremailfieldname.keyboardType = UIKeyboardType.emailAddress
Note the lowercase in emailAddress
lowercase
emailAddress
Note: also that you can assign the keyboard type in the TextField definition in the storyboard.
TextField