ios - Slow Tableview with custom cell with images, Swift 3 and core data -


i trying solve slow, sluggish scrolling on table.

i'm using core data wrapper aerecord fetch data, , scrolls smooth without cell.toneimage.image = uiimage(named: tone.image)

the images aren't big ( 350 x 170) def freezes second scroll enough load new image.

i checked blended images in simulator, etc.. data being fetched + loading image @ same time? ideas or suggestions?

override func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {      let cell = tableview.dequeuereusablecell(withidentifier: "cell", for: indexpath) as! mwcelltableviewcell     self.configurecell(cell, atindexpath: indexpath)      return cell }  func configurecell(_ cell: mwcelltableviewcell, atindexpath indexpath: indexpath) {      if let frc = fetchedresultscontroller {         if let tone = frc.object(at: indexpath) as? tone {             // set data              cell.tonetitle.text = tone.name.uppercased()              let img:uiimage = tone.fav ? #imageliteral(resourcename: "likebtnon") : #imageliteral(resourcename: "likebtnoff")             cell.favbutton.setimage(img, for: .normal)             cell.favbutton.tag = indexpath.row             cell.favbutton.addtarget(self, action: #selector(favme(_:)), for: .touchupinside)               cell.toneimage.image = uiimage(named: tone.image)             cell.toneimage.layer.cornerradius = 8.0             cell.toneimage.clipstobounds = true          }     } }

there 2 way solve this

  1. fetch , set image in background using async.

  2. fetch image before reloading tableview data


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