ios - Passing NSString via prepareForSegue - Swift -

i'm trying pass string modal view controller seen below, using prepareforsegue method. see below:

here initial view controller present modal view:

override func prepareforsegue(segue: uistoryboardsegue!, sender: anyobject!) {      if segue.identifier == "newproject" {         var newprojectvc:modalviewcontroller = modalviewcontroller()         newprojectvc = segue.destinationviewcontroller modalviewcontroller         newprojectvc.teststring = "hello"     } } 

here modal view controller:

import uikit  class modalviewcontroller: uiviewcontroller {      var teststring:nsstring!      override func viewdidload() {         println(self.teststring)     } } 

here looks in storyboard: ![enter image description here][1]

the problem throws exception on line:

    newprojectvc = segue.destinationviewcontroller modalviewcontroller 

i have feeling navigation controller unsure, ideas?

you right destinationviewcontroller navigation controller not modalviewcontroller, try that:

let navigationcontroller = segue.destinationviewcontroller uinavigationcontroller let newprojectvc = navigationcontroller.topviewcontroller modalviewcontroller newprojectvc.teststring = "hello"