ios - Why is my Swift Program stalling and not running? -

class gameviewcontroller: uiviewcontroller {     func shuffle<c: mutablecollectiontype c.index == int>(var list: c) -> c {     let c = count(list)     in 0..<(c - 1) {         let j = int(arc4random_uniform(uint32(c - i))) +         swap(&list[i], &list[j])     }     return list } @iboutlet weak var backround: uiimageview! @iboutlet weak var button1: uibutton! @iboutlet weak var button2: uibutton! @iboutlet weak var button3: uibutton! @iboutlet weak var button4: uibutton! @iboutlet weak var button5: uibutton! @iboutlet weak var earthy: uiimageview! @iboutlet weak var blocker: uiimageview! @iboutlet weak var asteroid5: uiimageview! @iboutlet weak var asteroid4: uiimageview! @iboutlet weak var asteroid3: uiimageview! @iboutlet weak var asteroid2: uiimageview! @iboutlet weak var asteroid1: uiimageview!   let realasteroid = uiimage(named: "asteroid")         var numberarray = ["1", "2", "3", "4", "5"] var playerscore = 0 var aliveornah:bool = true var positioningnumrock = arc4random_uniform(5) + 1 var positioningnumblocker = arc4random_uniform(5) + 1          //set random numbers override func viewdidload(){      var shufflednumarray:array = shuffle(numberarray)     println(shufflednumarray)     var but1string:string = shufflednumarray[0]     var but2string:string = shufflednumarray[1]     var but3string:string = shufflednumarray[2]     var but4string:string = shufflednumarray[3]     var but5string:string = shufflednumarray[4]       self.button1.settitle(but1string,forstate: uicontrolstate.normal)     self.button2.settitle(but2string,forstate: uicontrolstate.normal)     self.button3.settitle(but3string,forstate: uicontrolstate.normal)     self.button4.settitle(but4string,forstate: uicontrolstate.normal)     self.button5.settitle(but5string,forstate: uicontrolstate.normal)     var posrandnum = arc4random_uniform(5) + 1      func offwiththerocks(){     switch posrandnum{     case 1:         self.asteroid1.center.y += view.bounds.height         uiview.animatewithduration(10.0, animations: {             self.asteroid1.center.y -= self.view.bounds.height - 100         })        case 2:          self.asteroid2.center.y += view.bounds.height         uiview.animatewithduration(10.0, animations: {                 self.asteroid2.center.y -= self.view.bounds.height - 100             })       case 3:              self.asteroid3.center.y += view.bounds.height             uiview.animatewithduration(10.0, animations: {                 self.asteroid3.center.y -= self.view.bounds.height - 100             })       case 4:              self.asteroid4.center.y += view.bounds.height             uiview.animatewithduration(10.0, animations: {                 self.asteroid4.center.y -= self.view.bounds.height - 100             })       case 5:              self.asteroid5.center.y += view.bounds.height                          uiview.animatewithduration(10.0, animations: {                 self.asteroid5.center.y -= self.view.bounds.height - 100             })        default:         break     }     } 

}

}

this code builds whenever hit play button move onto view program stalls , code above not run. suggestions? know did wrong? beginner aware have made dumb mistake or something.

the switch/case code never run, because have placed inside function declaration func offwiththerocks(){ ... } , function never called. try deleting func offwiththerocks(){ , associated trailing }.