ios - Save number in Label even when restart app -

i'm trying save number tapped on button shown on label. want number tapped on button save in label when close app , add additional tapps saved number.

import uikit import iad  class viewcontroller: uiviewcontroller, adbannerviewdelegate {      @iboutlet var taplabel: uilabel!     @iboutlet var banner: adbannerview!      var taps = 0          override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.              banner.hidden = true             banner.delegate = self             self.candisplaybannerads = true      }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }      func bannerviewactionshouldbegin(banner: adbannerview!, willleaveapplication willleave: bool) -> bool {         return true     }      func bannerviewdidloadad(banner: adbannerview!) {         banner.hidden = false     }       @ibaction func button(sender: uibutton){          taps += 1         taplabel.text = "taps: \(taps)"       }  } 

use nsuserdefault purpose this:

to save integer nsuserdefault can use following code:

nsuserdefaults.standarduserdefaults().setinteger(textfield.text, forkey: "key") 

to value saved nsuserdefault use following code:

nsuserdefaults.standarduserdefaults().integerforkey("key") 

edit
set taps, following

@ibaction func button(sender: uibutton){     taps += 1     taplabel.text = "taps: \(taps)"     nsuserdefaults.standarduserdefaults().setinteger(taps, forkey: "key") } 

to taps, in viewdidload function

taplabel.text = string(nsuserdefaults.standarduserdefaults().integerforkey("key"))