ios - app does not function properly in iphone 5 and 4s simulator -

this weirdest thing, when run app in simulator on xcode functions except when try run in iphone 4s simulator , iphone 5 simulator acts funny. in function below have animations taking place. , mean acting funny these animations run smoothly , can see dots created move across screen gradually in iphone 4s , 5 simulators dont see animations @ or see brief flashes of them have no idea why. please help!!

func go () {

    // remove add banner view     self.gameadbanner?.hidden = true       // enable user interaction of content view     self.contentview.userinteractionenabled = true      // make level label appear     uiview.animatewithduration(0, delay: 1, options: nil, animations: {         self.levellabel.alpha = 1         self.levelnumber.alpha = 1         }, completion: {finished in self.displayad()})       // declare delay counter varriables     var delaycounter:int = 100000     var durationcounter:double = 0         // initiate starting level     levelnumber.text = string(level)         // set random number varriable make amount of dots in each color 1 color     var diversifyreddots = arc4random_uniform(5)     var diversifybluedots = arc4random_uniform(5)     var diversifyyellowdots = arc4random_uniform(5)     var diversifygreendots = arc4random_uniform(5)       // create if statement first 2 levels dots spawn     if level < 3 {          diversifyreddots = 4      }            // loop------------------      loop in 0...loopnumber {            // set constants animations          let reddelay = nstimeinterval(arc4random_uniform(100000) + delaycounter) / 30000          let bluedelay = nstimeinterval(arc4random_uniform(100000) + delaycounter) / 30000          let yellowdelay = nstimeinterval(arc4random_uniform(100000) + delaycounter) / 30000          let greendelay = nstimeinterval(arc4random_uniform(100000) + delaycounter) / 30000            let options = uiviewanimationoptions.allowuserinteraction | uiviewanimationoptions.layoutsubviews            //set constants dots          let redsize:cgfloat = 54          let redyposition : cgfloat = cgfloat( arc4random_uniform(150)) + 54            let bluesize:cgfloat = 54          let blueyposition : cgfloat = cgfloat( arc4random_uniform(150)) + 54            let yellowsize:cgfloat = 54          let yellowyposition : cgfloat = cgfloat( arc4random_uniform(150)) + 54            let greensize:cgfloat = 54          let greenyposition : cgfloat = cgfloat( arc4random_uniform(150)) + 54            // create dots , add them view         let reddot = uibutton()          reddot.setbackgroundimage(reddot, forstate: uicontrolstate.normal)          reddot.frame = cgrectmake(-100, redyposition, redsize, redsize)          self.contentview.addsubview(reddot)            let bluedot = uibutton()          bluedot.setbackgroundimage(bluedot, forstate: uicontrolstate.normal)          bluedot.frame = cgrectmake(-100, blueyposition, bluesize, bluesize)          self.contentview.addsubview(bluedot)            let yellowdot = uibutton()          yellowdot.setbackgroundimage(yellowdot, forstate: uicontrolstate.normal)          yellowdot.frame = cgrectmake(-100, yellowyposition, yellowsize, yellowsize)          self.contentview.addsubview(yellowdot)            let greendot = uibutton()          greendot.setbackgroundimage(greendot, forstate: uicontrolstate.normal)          greendot.frame = cgrectmake(-100, greenyposition, greensize, greensize)          self.contentview.addsubview(greendot)                // define animations         // red          if diversifyreddots > 5 {              // increase actual red             self.increasered()              // increase count dot number               uiview.animatewithduration(dotduration , delay: reddelay - 6, options: options, animations: {                  reddot.frame = cgrectmake(700, redyposition, redsize, redsize)                  }, completion: {finished in reddot.removefromsuperview()})          }              // blue          if diversifybluedots > 5 {              // increase actual blue             self.increaseblue()              // increase count dot number              uiview.animatewithduration(dotduration , delay: bluedelay - 6, options: options, animations: {                  bluedot.frame = cgrectmake(700, blueyposition, bluesize, bluesize)                  }, completion: {finished in bluedot.removefromsuperview()})          }            // yellow          if diversifyyellowdots > 5 {              // increase actual yellow             self.increaseyellow()              // increase count dot number              uiview.animatewithduration(dotduration , delay: yellowdelay - 6, options: options, animations: {                  yellowdot.frame = cgrectmake(700, yellowyposition, yellowsize, yellowsize)                  }, completion: {finished in yellowdot.removefromsuperview()})          }            // green          if diversifygreendots > 5 {              // increae acutual green             self.increasegreen()              // increase count dot number              uiview.animatewithduration(dotduration , delay: greendelay - 6, options: options, animations: {                  greendot.frame = cgrectmake(700, greenyposition, greensize, greensize)                  }, completion: {finished in greendot.removefromsuperview()})           }                       // incremint counters          delaycounter+=50000          diversifyreddots++         diversifybluedots++         diversifyyellowdots++         diversifygreendots++        }