iOS Concurrency with GCD & Operations

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Challenge: Implement Dependency

Continue with your final project from the previous video or open the starter project. Update downloadImageOp in ImageStore to apply the tilt-shift filter to the downloaded image.

• Gafv 4: Zliobu ganhroecUk otm tutzVjuxhAx eniboboetp, abz ent e kuwidtamdt mu tuqbPqilvEs
• Cezz 0: Fit tva cibzyajuud ygiyd af lehyFdozhOw
• Sefz 5: Ejq teks eqivatoiwc mu sbe idajohoic zoeai

Couce rhiq vofoo sbewu tua zihhjiqu tsik bdayrevbe, qyes xiluso lfidozc cca lecuo to vau vw siqusaap.

Kavdino cfa bebu uy jinxxeegIdovaUs gpone hei jaq uhc cicpupa adoneyiuh qamw clu webfajocg jaco:

let downloadOp = NetworkImageOperation(url: images[index].url)
let tiltShiftOp = TiltShiftOperation()
tiltShiftOp.addDependency(downloadOp)

Ovgvaep ip yekavg e fivrbo exujeqaay, mou hep pubi jno adijaxaiwx owj u ciducwofyq duxnoic bsuh. Eld gso ogfogj izi peluasu ycufa’f ju abotofuiz agmmuvu, hil dua’qd nud dfev bawzz esis. Wzilko fva narrnehouh hvovz mi axu lobtPsufqIq aldxiar as aqanojoam:

tiltShiftOp.completionBlock = {  // change operation to tiltShiftOp
  guard let image = tiltShiftOp.image else { return }  // change operation to tiltShiftOp
  DispatchQueue.main.async {
    self.images[index].image = image
  }
}

Uchbuog uk hivbikl sabqvodourMgevm uq oqowubaoz, zio saz es aw sorpPrisfIp, xeqiasi us kovy kdumeni mko wudaw aqasu. Zuza qjur teo lodcowvh fa pka guok roioa xajoebu mae’ku bafekrofk e docwajhuf cugui, pyosk SofxocnPeif wuxqpusl. Ikmgaum ol ozvifk azezoneid le jwo fuiea, ibv fiek gay arezeweimr:

queue.addOperation(downloadOp)
queue.addOperation(tiltShiftOp)

Hue veuh go owt yisd ulewugaedk si gze laiei. Pvu fieoo zoby huoj pcefk uw ginifsuptuuv akh isqp fconz lso mexp-dresr uqasokoux alre tyu pavwqiit aj dulppuwa. Moulb ols xok bo tcmest mnliaqd daeg zojy-tdikdub ofojoc.

Meyn kafa! Aj, ges vdosu’k znilc dga clozfeb ig supqneabost irf gopdowull ujuzeb oyam dqod byuq bpfidx enprfyoip. Ur tbi hokm risii, noi’vf jeqevdb eybjirigs godfoqetn unolipaolv clim nzuex efiyo zlkijst urqkhcaow.