swift - Memory issues with UIImage Animation Image Caching -


i've been banging head against days , can't bottom of it. have keyboard extension uses uicollectionview display animated uiimages. when it's running , switch app switch keyboard i'm getting spike around 10mb. crashes app after few swaps.

i've gone through instruments , looks i'm getting heaps of uiimages when keyboard reloads, 'eventually' cleaned takes while , accumulative effect max's out memory. think it's uiimage caching animation image start around 150 - 200 uiimages, correlates total animation frames have across cells. pretty doubles every reload.

i've thrown cell prepareforreuse:

override func prepareforreuse() {     if imageview?.isanimating() == true {         nslog("stop animating")         imageview?.stopanimating()     }     imageview?.animationimages = nil     contentview.subviews.map({$0.removefromsuperview()})     imagerect = cgrect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)     imageview = uiimageview(frame: imagerect!)     type = nil     super.prepareforreuse()     imageview?.contentmode = uiviewcontentmode.scaleaspectfit     contentview.addsubview(imageview!) }

but no avail. isn't getting called on reload. so, new cells being created, old ones aren't being cleared maybe?

i've tried running this:

    func clearcellimages(){     cell in collectionview.visiblecells(){         cell.imageview!?.animationimages = nil         cell.imageview!!.image = nil     } }

on viewdiddisappear , deinit, no difference.

it took me soooooo long find issue, , have, i'm stumped. happy post code think help, happy pointed in right direction.

thanks.

so turned out 2 pronged solution. first made these little helper functions:

func clearcells(){     cell in collectionview.visiblecells(){         clearcell(cell as! mycellview)     } }  func clearcell(cell:mycellview){     if let iv = cell.imageview {         iv.animationimages = nil         iv.image = nil         iv.removefromsuperview()     } }

i called clearcells on viewwilldisappear, , saw drop in uiimages , memory use, however, if had scrolled, more likely, images had been used in cells not visible not de-referenced, resulting in small, not insignificant memory creep. fixed calling clearcell on didenddisplayingcell delegate method:

func collectionview(collectionview: uicollectionview, didenddisplayingcell cell: uicollectionviewcell, foritematindexpath indexpath: nsindexpath) {     clearcell(cell as! mycellview) }

i have thought kind of management handled, if not automatically arc, or uicollectionview, @ least manually through preparecellforreuse, apparently not.

hope helps :)


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