ios - CIDetector not detecting QRCodes -

i'm trying detect qrcode uiimage using cidetector in order extract messagestring it.

i have function receives uiimage input , returns decoded messagestring.

the uiimage pass function extracted user gallery using phasset, phassetcollection, phimagerequestoptions etc. request made synchronously , images quality (i've tried present image in uiimageview make sure image readable).

here can see snippet of code request images:

let _: phimagerequestid = phimagemanager.defaultmanager().requestimageforasset(asset as! phasset, targetsize: size, contentmode: phimagecontentmode.aspectfit, options: options, resulthandler: { (image: uiimage?, info:[nsobject : anyobject]?) -> void in                     images.append(image!)                 }) 

after getting images want detect qrcodes , i'm using following code:

func scanimage(image: ciimage) -> string {      let detector = cidetector(oftype: cidetectortypeqrcode, context: nil, options: [cidetectoraccuracy:cidetectoraccuracyhigh])     var image = ciimage(image: uiimage)      var decode = ""     let features = detector.featuresinimage(image!)     feature in features as! [ciqrcodefeature] {         decode = feature.messagestring     }     return decode } 

i found (core image detector(cidetector) not detecting qrcodes) , other similar questions none of them seems work.

this tutorial followed https://www.shinobicontrols.com/blog/ios8-day-by-day-day-13-coreimage-detectors

am doing wrong?

thanks in advance

the problem passing ciimage in function

func scanimage(image: ciimage) 

and add image variable undefined image in

var image = ciimage(image: uiimage) 

remove line , should ok writing qrcode myself , if interested can check out.

// open photo library  func loadgallery() {     let imagepicker = uiimagepickercontroller()     imagepicker.delegate = self     imagepicker.sourcetype = .photolibrary     self.presentviewcontroller(imagepicker,         animated: true,         completion: nil) }  // read qrcode selecting image func imagepickercontroller(picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [string : anyobject]) {     let qrimg:uiimage = info[uiimagepickercontrolleroriginalimage] as! uiimage      if #available(ios 8.0, *) {         let detector:cidetector = cidetector(oftype: cidetectortypeqrcode, context:nil, options:[cidetectoraccuracy: cidetectoraccuracyhigh])         let ciimg: ciimage = ciimage(image: qrimg)!         let features = detector.featuresinimage(ciimg)          feature in features as! [ciqrcodefeature] {             print(feature.messagestring)         }       } else {         // fallback on earlier versions     }      dismissviewcontrolleranimated(true, completion: nil) } 

update swift 3 xcode 8.1

// read qrcode selecting image func imagepickercontroller(_ picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [string : any]) {       let qrimg:uiimage = info[uiimagepickercontrolleroriginalimage] as! uiimage      if #available(ios 8.0, *) {         let detector:cidetector = cidetector(oftype: cidetectortypeqrcode, context:nil, options:[cidetectoraccuracy: cidetectoraccuracyhigh])!         let ciimg: ciimage = ciimage(image: qrimg)!         let features = detector.features(in: ciimg)          feature in features as! [ciqrcodefeature] {             print(feature.messagestring!)         }       } else {         // fallback on earlier versions     }     dismiss(animated: true, completion: nil) } 

hope helpfull