Unless it's disabled, on recent versions of OS X and iOS, you can also hold down the letter to get a pop-up of variations. Holding down "e" shows me ėęēêèéë var

Unless it's disabled, on recent versions of OS X and iOS, you can also hold down the letter to get a pop-up of variations. Holding down "e" shows me ėęēêèéë variations. At least, on my US English locale, it does.