ios - How to make 3 textFields in a ViewController take only integer input - XCode -

i have 3 textfields called text1,text2, , text3.

how program them accept integer input?

most of similiar questions i've seen don't work in newest version of xcode (using swift 2) , don't cater multiple textfields.

this 1 seemed helpful: how can declare text field can contain integer?

first change keyboardtype uikeyboardtypenumberpad suggested ianurag

and check content change in delegate method shouldchangecharactersinrange (code tested swift 2.0 , xcode 7)

func textfield(textfield: uitextfield, shouldchangecharactersinrange range: nsrange, replacementstring string: string) -> bool {      // find out text field after adding current edit     let text = (textfield.text! nsstring).stringbyreplacingcharactersinrange(range, withstring: string)      if  text == "" {         return true     }       if let _ = int(text) {         return true     } else {      return false     }  }