ios - Storing input from field as variable with swift 3 -

i realize question has been asked numerous times before, can't quite solutions work, copying , pasting them, , suspect swift documentation spans 3 versions since swift's release.

i'm attempting simple storing variable field input , not having luck.

import uikit  class viewcontroller: uiviewcontroller {   @iboutlet var usernumber: uilabel! @iboutlet var userfield: uitextfield!  @ibaction func userbutton(_ sender: uibutton) {      let userinput = userfield.text     //some action     }  override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. } 

}

you should check whether have set textfield's delegate respect parent view controller.

go storyboard. select textfield. right click on it. set delegate textfield view controller