‘NSInternalinconsistencyException’,reason: ‘Only run on the main thread!’.
也许这不是验证QR码的正确位置,或者不适合segue,但如果没有,我想知道验证和segue应该在哪里进行.我唯一的另一个要求是验证仅在检测到QR码时才会发生.
class ScanVIEwController: RSCodeReaderVIEwController{ // Class Variables var finalObject: IBuiltCode? let ObjectHelper = ObjectBuilder() // Service to valIDate and build valID scanned objects overrIDe func vIEwDIDLoad() { super.vIEwDIDLoad() self.focusMarkLayer.strokecolor = UIcolor.redcolor().CGcolor self.cornersLayer.strokecolor = UIcolor.yellowcolor().CGcolor self.tapHandler = { point in println(point) } self.barcodesHandler = { barcodes in for barcode in barcodes { println("barcode found: type=" + barcode.type + " value=" + barcode.stringValue) if let builtObject = self.ObjectHelper.valIDateAndBuild(barcode,scannedData: barcode.stringValue){ println("Good object.") self.performQR() } } } } func performQR(){ performSegueWithIDentifIEr("toQR",sender: self) } overrIDe func prepareForSegue(segue: UIStoryboardSegue,sender: AnyObject?) { if (segue.IDentifIEr == "toQR"){ let QRVC: QRVIEwController = segue.destinationVIEwController as! QRVIEwController QRVC.receivedobject = finalObject as? QRObject } }}@R_404_6120@ 我在 this issue线程上联系了RSbarcodes_Swift的开发人员.为了执行任何UI *** 作,需要在主线程上运行.例如,需要更改segue函数:
func performQR(){ self.performSegueWithIDentifIEr("toQR",sender: self)}
至
func performQR(){ dispatch_async(dispatch_get_main_queue(),{ () -> VoID in self.performSegueWithIDentifIEr("toQR",sender: self) })}
为了避免在扫描时多次进行segueing,可以在条形码for循环中使用调用self.session.stopRunning()和breakcan.
self.barcodesHandler = { barcodes in for barcode in barcodes { println("barcode found: type=" + barcode.type + " value=" + barcode.stringValue) if let builtObject = self.ObjectHelper.valIDateAndBuild(barcode,scannedData: barcode.stringValue){ println("Good object.") self.finalObject = builtObject self.session.stopRunning() // AvoID scanning multiple times self.performQR() break } }}总结
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