ios - UIImage created with animatedImageWithImages have bugs? -

recently found gif image not shown. write test code it:

import uikit import imageio  extension uiimage {     static func gifimagearray(data: nsdata) -> [uiimage] {         let source = cgimagesourcecreatewithdata(data, nil)!         let count = cgimagesourcegetcount(source)         if count <= 1 {             return [uiimage(data: data)!]         } else {             var images = [uiimage]();   images.reservecapacity(count)             in 0..<count {                 let image = cgimagesourcecreateimageatindex(source, i, nil)!                 images.append( uiimage(cgimage: image) )             }             return images;         }     }      static func gifimage(data: nsdata) -> uiimage? {         let gif = gifimagearray(data)         if gif.count <= 1 {             return gif[0]         } else {             return uiimage.animatedimagewithimages(gif, duration: nstimeinterval(gif.count) * 0.1)         }     } }  class viewcontroller: uiviewcontroller, uitableviewdatasource, uitableviewdelegate {     let _gifdata : nsdata = nsdata(contentsofurl: nsurl(string: "https://upload.wikimedia.org/wikipedia/commons/d/d3/newtons_cradle_animation_book_2.gif")!)!     lazy var _gifimagearray : [uiimage] = uiimage.gifimagearray(self._gifdata)     lazy var _gifimage : uiimage = uiimage.gifimage(self._gifdata)!      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.         let table = uitableview(frame: self.view.bounds, style: .plain)         table.datasource = self         table.delegate = self         self.view.addsubview(table)     }      func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {         return 1000;     }      func numberofsectionsintableview(tableview: uitableview) -> int {         return 1;     }      func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {         let identifier = "cell"         var cell : uitableviewcell! = tableview.dequeuereusablecellwithidentifier(identifier);         if cell == nil {             cell = uitableviewcell(style: .default, reuseidentifier: identifier)         }          if let imageview = cell.imageview {             /** 1. use same uiimage object created animatedimagewithimages                 image disappear when reuse, , when touching cell, reappear. */             imageview.image = self._gifimage              /** 2. create different uiimage using same image array. still not work */ //            imageview.image = uiimage.animatedimagewithimages(self._gifimagearray, duration: nstimeinterval(self._gifimagearray.count) * 0.1)              /** 3. create different uiimage data, seems work                 use lot of memories. , seems has performance issue. */ //            imageview.image = uiimage.gifimage(self._gifdata)              /** 4. use same image array imageview's animationimages.                 kind works, have different api set image.                 , when click on cell, animation stops.    */ //            imageview.image = self._gifimagearray[0] //            imageview.animationimages = self._gifimagearray //            imageview.startanimating()         }          return cell     } } 

notice in cellforrowatindexpath: method, tried different way set imageview.

when po object in lldb, notice animated imageview have cakeyframeanimation. makes tip?

how can make gif shown perfectly? suggestion helpful.

here preview: after scroll, gif disappear, , reappear when touch

after tried many times, have figured out need change:

imageview.image = self._gifimage 

to:

imageview.image = nil // magical! imageview.image = self._gifimage 

just set image nil before set new image, , animation work!! it's magical!

this apple's bug.