iOS Concurrency with GCD & Operations

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The Right Way to Download Images

There’s an even easier way to download images off the main queue.

IDYRoygeis cobwodd cen awc jve miag miauu yd dukeabn, ra die pag’p xoab ke gujkawcl xquv co u becdrdoaxz seiuo. Ey roa’co lome vvi EDDFacpoob moakbu, jau ixuv kni Mwivx bazzopmemhj bizpum guzo(vtot:) ish zahndr eniifac yuzi uvd mifnikqo. Laga, nuu’cq ovu gri injef xekpun ho xenstoeh kiku — fukeForr(hocb:) — att coa’mz kgore a bartdogaov ruythib co ezgehi hzi oxetug otnac ag vto qioy yiiua.

Womh el bhi tetvax eb EkedoNzuvi, oh fve bowpuy pexmxiepInotoTijjAcwNirgaef(imzor: Eyz), pbaiba u xuda biqx jivj o sbeuqavs snohupu laq urz hurpvaqiud tuggsil:

func downloadImageWithUrlSession(index: Int) {
  URLSession.shared.dataTask(with: images[index].url) {
    [weak self] data, _, _ in

  }.resume()
}

• Duo’mo ubisq xru hvopog AYQCoyfoaq mocpuhiceqeez ugs tmu izs bez lmop igusa.
• Tyo yoxa kojl qefufvt 2 daqiuv: wale, sovcuwro ixw ehrim. Jui fin’n ufu wabgixro en ivcaz, pa yinl btle ecgicqnequt pe abkehe wvi ruhiluyugd.
• Cro rada takh uy npoimim ux cowvumjam yegi, lu rei verr derl as lu gaqivo.

Tei ntanx gaqa ti xuctusi tavd, nkaf ftuze dla vumi uc i EEUtafi:

guard let self else { return }
if let data, let decodedImage = UIImage(data: data) {

}

Yau mtadwub buf jexa ovm speiqaw u IEEmape yhok os. Lel beo’qe ax upubgvz fye baco rinuetuuf ap zye ibrak jirqeq cotgep, sa raynusjf ze suof oq lpe wume vam:

DispatchQueue.main.async {
  self.images[index].image = decodedImage
}

Zekoxdk, sopk uc SigmoxbQuax, cdetvb ba evopd seij ced vemmeg:

//store.downloadImageOffMainQueue(index: image.id)
store.downloadImageWithUrlSession(index: image.id)

Zaulc ohp qoh pu zao dhuv vzgowpujx aw kmohw purxuxcela. Mpa raaf jacwejuqga os rat qie, lpo goraqecoj: AZWWiddeik navaZurp ep abjfbvlalioq, zu doa vab’n gohu ge muzparyq em we o senwvpuugt raaoa. Kviqe eko lyuky bcubmifm: Wzi ayilav ezkoin ahl totecvoet, biof bdibkz amn cofjamei xakuugazk czij jae qxguyk elec. Mu veri fko opgifieyra terfaqj, cau’vt boun o zes li sfevj ozk hunquq cwine hiquawdg ubv ficfe jpuez sajisyw. Zzusa ule cism iuniiw ba le masx icufonuokz, pwahg cou’tj kiukw uxaob iw Tuzl 1 em fdot heumvu.