Download image not being displayed iOS Swift -

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i'm trying download images , display them based on different conditions. code worked if download images in main thread, trying download them through end now.

my console clean, i'm not getting errors - yet images not being displayed? first attempt @ doing end image downloading , doing swift come objective-c.

could please @ code below , let me know problem is?

//fizzbuzz image download weak var fizzbuzzimage: uiimage! let fizzbuzzstring = "https://emkaydeum.files.wordpress.com/2015/08/fizzbuzz.png" var fizzbuzzurl:nsurl!  //fizz image download weak var fizzimage: uiimage! let fizzstring = "https://vignette2.wikia.nocookie.net/leagueoflegends/images/b/b0/fizz_render.png/revision/latest?cb=20151205185848" var fizzurl:nsurl!  //buzz image download weak var buzzimage: uiimage! let buzzstring = "https://vignette2.wikia.nocookie.net/disney/images/b/bc/buzz_disney_infinity_render.png/revision/latest?cb=20140605182818" var buzzurl:nsurl!  override func viewdidload() {     super.viewdidload()      fizzbuzzurl = nsurl(string: fizzbuzzstring)     fizzurl = nsurl(string: fizzstring)     buzzurl = nsurl(string: buzzstring) }  @ibaction func checktextfield(_ sender: uitextview){      enteredvalue = userinput.text      let checkifempty = userinput.text?.isempty      if (checkifempty == false) {     let multipleof3:int = int(enteredvalue)!%3     let multipleof5:int = int(enteredvalue)!%5          if (multipleof3 == 0 && multipleof5 == 0) {             fizzbuzz.text = "fizzbuzz"             urlsession.shared.datatask(with: (fizzbuzzurl url), completionhandler: {(fizzbuzzdata, resp, error) -> void in                 if (error != nil && fizzbuzzdata != nil){                     operationqueue.main.addoperation ({                         self.displayimage.image = uiimage(data: fizzbuzzdata!)                     })                 }                 }).resume()}         else if (multipleof5 == 0){             fizzbuzz.text = "buzz"             urlsession.shared.datatask(with: (buzzurl url), completionhandler: {(buzzdata, resp, error) -> void in                 if (error != nil && buzzdata != nil){                     operationqueue.main.addoperation ({                         self.displayimage.image = uiimage(data: buzzdata!)                 })                 }                 }).resume()}         else if (multipleof3 == 0){             fizzbuzz.text = "fizz"             urlsession.shared.datatask(with: (fizzurl url), completionhandler: {(fizzdata, resp, error) -> void in                 if (error != nil && fizzdata != nil){                     operationqueue.main.addoperation ({                         self.displayimage.image = uiimage(data: fizzdata!)                 })                 }                 }).resume()}         else {             fizzbuzz.text = "incorrect value"             displayimage.image = nil         }     } }

please check if conditions. have written 

if (error != nil && fizzbuzzdata != nil){                     operationqueue.main.addoperation ({                         self.displayimage.image = uiimage(data: fizzbuzzdata!)                     })                 }

which never executed. please make below

 if (error == nil && fizzbuzzdata != nil){                     operationqueue.main.addoperation ({                         self.displayimage.image = uiimage(data: fizzbuzzdata!)                     })                 }




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