ios - unexpectedly found nil while unwrapping an Optional value On UILabel -

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in project have implemented protocol makes url call , return result, , intent show result in uilabel. following code : 

protocol restapiresult {    func retrivedriverinfo() }  class restapicall :  restapiresult {    func retrivedriverinfo()     {      self.dashboardviewcontroller.getdriverinfo(driverprofile)     // calling function of next view lable setup     } }

getdriverinfo in nextview has outlet of textview 

class dashboardviewcontroller: uiviewcontroller {        override func viewdidload()         {         super.viewdidload()          restdeledate = restapicall()          restdeledate!.retrivedriverinfo()      // if label set here no error       //totaltriplabel.text = "testing"  // no error          }         func getdriverinfo(driverinfoarray : nsarray)        {         totaltriplabel.text = "testing" // here error        }  }

if text set in viewdidload() doesn't crash. when tried set value in delegate function crash saying found null.


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