One button, 2 action and name change, Swift? -

i'm new field, maybe simple question, not know, swift. know how make 2 buttons used stopwatch, start , stop. have same button start , stop stopwatch, , text change stop start, possible , how?

i able create simple ios project works requirements. here step step.

create uiviewcontroller scene in project's storyboard , name "viewcontroller". add uibutton auto layout constraints in scene. in project navigator, create uiviewcontroller subclass file following code in it:

import uikit  class viewcontroller: uiviewcontroller {      @iboutlet weak var mybutton: uibutton!      var timer: nstimer?     var myint = 0      var launchbool: bool = false {         didset {             if launchbool == true {                 mybutton.settitle("stop", forstate: .normal)                 timer = nstimer.scheduledtimerwithtimeinterval(1, target: self, selector: "firestopwatch", userinfo: nil, repeats: true)             } else {                 mybutton.settitle("start", forstate: .normal)                 timer?.invalidate()                 timer = nil                 myint = 0             }         }     }       @ibaction func buttonaction(sender: anyobject) {         launchbool = !launchbool //true false, false true...     }      func firestopwatch() {         myint += 1         println(myint)     }      override func viewdidload() {         super.viewdidload()          mybutton.settitle("start", forstate: .normal)     }      override func didreceivememorywarning() {         super.didreceivememorywarning()     }  } 

link @ibaction , @iboutlet uibutton in viewcontroller scene. launch project.

each time click on uibutton, toggles title between "start" , "stop". each time click on "start", displays increasing value of myint in xcode console. each time click on "stop", stops nstimer , resets myint 0.