uitableview - BackgroundImageView should Animate -

i want fade in uiimageview backgroundview of uitableview. it's not animating. image there. ideas why?

here code:

override func viewwillappear(animated: bool) {     super.viewwillappear(animated)      let backgroundimage = uiimage(named: "theimage")     let imageview = uiimageview()     imageview.image = backgroundimage     imageview.contentmode = uiviewcontentmode.scaleaspectfit     self.tableview.backgroundview = imageview      //tried way     imageview.alpha = 0.0      //and way     self.tableview.backgroundview?.alpha = 0.0      uiview.animatewithduration(3.0, animations: { () -> void in         //both not animating         self.tableview.backgroundview?.alpha = 1.0         imageview.alpha = 1.0     }) } 

thanks

it doesn't work because call in viewwillappear happens before view loaded animation invisible. try change viewdidappear , work. don't need change

self.tableview.backgroundview?.alpha = 0.0 

imageview.alpha enough, try that:

override func viewdidappear(animated: bool)     {         super.viewdidappear(animated)          let backgroundimage = uiimage(named: "theimage")         let imageview = uiimageview()         imageview.image = backgroundimage         imageview.contentmode = uiviewcontentmode.scaleaspectfit         self.tableview.backgroundview = imageview          imageview.alpha = 0.0          uiview.animatewithduration(3.0, animations: { () -> void in             imageview.alpha = 1.0         })     }