ios - Cannot invoke 'append' with an argument list of type'(String)' in my firstViewController -

firstviewcontroller. problem is. in 'for loop' giving me error. have tried use xcode suggested, isn't working. still consider myself beginner swift. looked @ other answers when people have posted same question , still can't solve problem.

 import uikit  var todoitems:[string] = []  class firstviewcontroller: uiviewcontroller, uitableviewdatasource, uitableviewdelegate {      @iboutlet var taskstable:uitableview?      override func viewdidload() {         super.viewdidload()      }      func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {         return todoitems.count     }      func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {          var cell = uitableviewcell(style: uitableviewcellstyle.default, reuseidentifier: "cell")          cell.textlabel?.text = todoitems[indexpath.row]          return cell     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }      override func viewwillappear(animated: bool) {          if var storedtodoitems : anyobject?  = nsuserdefaults.standarduserdefaults().objectforkey("todoitems") {              todoitems = []              var = 0; < storedtodoitems?.count(); ++i {                 todoitems.append(storedtodoitems[i] as! string)             }          }          taskstable?.reloaddata()     }   } 

this secondviewcontroller.

import uikit  class secondviewcontroller: uiviewcontroller, uitextfielddelegate {       @iboutlet weak var todoitem: uitextfield!      @ibaction func additembutton(sender: anyobject) {          todoitems.append(todoitem.text)          let fixedtodoitems = todoitems          nsuserdefaults.standarduserdefaults().setobject(fixedtodoitems, forkey: "toddoitems")         nsuserdefaults.standarduserdefaults().synchronize()          self.view.endediting(true)      }      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }      func textfieldshouldreturn(textfield: uitextfield) -> bool {         textfield.resignfirstresponder()         return true     }      override func touchesbegan(touches: set<nsobject>, withevent event: uievent) {         self.view.endediting(true)     }   } 

when load to-do list array nsuserdefaults, use if let test if it's [string] (that is, array of strings), , won't need cast string later on, might contributing error. try replacing viewwillappear method this:

override func viewwillappear(animated: bool) {      if let storedtodoitems = nsuserdefaults.standarduserdefaults().objectforkey("todoitems") as? [string] {          todoitems = []          var = 0; < storedtodoitems.count; ++i {             todoitems.append(storedtodoitems[i])         }     }      taskstable?.reloaddata() } 

while you're @ it, there's nicer way loop on contents of array in swift (and many other languages):

override func viewwillappear(animated: bool) {      if let storedtodoitems = nsuserdefaults.standarduserdefaults().objectforkey("todoitems") as? [string] {          todoitems = []          item in storedtodoitems {             todoitems.append(item)         }     }      taskstable?.reloaddata() } 

in case however, should able set variable directly loaded one:

override func viewwillappear(animated: bool) {      if let storedtodoitems = nsuserdefaults.standarduserdefaults().objectforkey("todoitems") as? [string] {         todoitems = storedtodoitems     }      taskstable?.reloaddata() }