swift - Making a view fadeout in time if slider value isn't updated -


i'm working on drawing app , when user selects brush size / color / opacity i'm making small preview of brush appear @ center of screen. make fade out after few seconds if value isn't updated. when tried implementing here, preview doesn't reappear when slider value updated. tried many things can't seem work. extract of code below. kindly let me know if have ideas of how can this.

slider value changed

func colordrawdidchange(sender:uislider!) {         if (sender.tag == 100) {             self.red = cgfloat(sender.value)         }         else if (sender.tag == 101) {             self.blue = cgfloat(sender.value)         }         else {             self.green = cgfloat(sender.value)         }         drawpreview()         animateout(previewview)     }

draw preview view

let previewview = uiimageview()  func drawpreview() {          previewview.hidden = false         previewview.alpha = 1.0         previewview.frame = cgrectmake(0,0,90,90)         previewview.center = cgpoint(x: screenwidth/2,y: screenheight/2)         self.view.addsubview(previewview)          uigraphicsbeginimagecontext(previewview.frame.size)         var context = uigraphicsgetcurrentcontext()           cgcontextsetlinecap(context, kcglinecapround)         cgcontextsetlinewidth(context, brushwidth)          cgcontextsetrgbstrokecolor(context, red, green, blue, opacity)         cgcontextmovetopoint(context, 45.0, 45.0)         cgcontextaddlinetopoint(context, 45.0, 45.0)         cgcontextstrokepath(context)         previewview.image = uigraphicsgetimagefromcurrentimagecontext()         uigraphicsendimagecontext()      }

animate out

func animateout(view1:uiview) {          uiview.animatewithduration(0.2, animations: {             view1.alpha = 1             }, completion: {                 (value: bool) in                 view1.hidden = true         })     }

solved calling method when user done using slider

sizedrawslider.addtarget(self, action: "removepreview", forcontrolevents: (.touchupinside | .touchupoutside))

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