为什么使用新的iOS 7 API扫描条形码真的很慢？

概述我目前正在尝试使用iOS 7的最新api来扫描代码39条形码,但它让我发疯.为了让它能够检测到它,我必须以特定的方式持续手机10秒钟.我将它与Red Laser,Zbar等进行了比较,他们可以在1秒钟内分析它,即使它有点歪斜.我不确定是不是因为我加载捕获会话的方式或者是什么.我很感激你的帮助.有关如何提高性能的任何建议？ 以下是我在viewDidLoad方法中加载扫描程序的方法： //Initia 我目前正在尝试使用iOS 7的最新API来扫描代码39条形码,但它让我发疯.为了让它能够检测到它,我必须以特定的方式持续手机10秒钟.我将它与Red Laser,Zbar等进行了比较,他们可以在1秒钟内分析它,即使它有点歪斜.我不确定是不是因为我加载捕获会话的方式或者是什么.我很感激你的帮助.有关如何提高性能的任何建议？

以下是我在vIEwDIDLoad方法中加载扫描程序的方法：

//Initialize Laser VIEw    laserVIEw = [[UIVIEw alloc] init];    laserVIEw.autoresizingMask = UIVIEwautoresizingFlexibletopmargin|UIVIEwautoresizingFlexibleleftmargin|UIVIEwautoresizingFlexibleRightmargin|UIVIEwautoresizingFlexibleBottommargin;    laserVIEw.layer.bordercolor = [UIcolor redcolor].CGcolor;    laserVIEw.layer.borderWIDth = 8;    laserVIEw.layer.cornerRadius = 10;    [self.vIEw addSubvIEw:laserVIEw];    //Start Session    scannerSession = [[AVCaptureSession alloc] init];    scannerDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVIDeo];    //define Error Messages    NSError *error = nil;    //define input    scannerinput = [AVCaptureDeviceinput deviceinputWithDevice:scannerDevice error:&error];    //Check if Device has a Camera    if (scannerinput) {        [scannerSession addinput:scannerinput];    } else {        NSLog(@"Error: %@",error);    }    // Locks the configuration    BOol success = [scannerDevice lockForConfiguration:nil];    if (success) {        if ([scannerDevice isautoFocusRangeRestrictionSupported]) {            // Restricts the autofocus to near range (new in iOS 7)            [scannerDevice setautoFocusRangeRestriction:AVCaptureautoFocusRangeRestrictionNear];        }    }    // unlocks the configuration    [scannerDevice unlockForConfiguration];    //define Output & Metadata Object Types    scannerOutput = [[AVCaptureMetadataOutput alloc] init];    [scannerOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    [scannerSession addOutput:scannerOutput];    scannerOutput.MetadataObjectTypes = [scannerOutput availableMetadataObjectTypes];    //Create VIDeo PrevIEw Layer    scannerPrevIEwLayer = [AVCaptureVIDeoPrevIEwLayer layerWithSession:scannerSession];    scannerPrevIEwLayer.frame = self.vIEw.bounds;    scannerPrevIEwLayer.vIDeoGravity = AVLayerVIDeoGravityResizeAspectFill;    [self.vIEw.layer addSublayer:scannerPrevIEwLayer];    //Start Session    [scannerSession startRunning];    [self.vIEw bringSubvIEwToFront:cancelbutton];    [self.vIEw bringSubvIEwToFront:laserVIEw];

和：

- (voID)captureOutput:(AVCaptureOutput *)captureOutput dIDOutputMetadataObjects:(NSArray *)MetadataObjects fromConnection:(AVCaptureConnection *)connection {    //Prepare Laser VIEw    CGRect laser = CGRectZero;    //Format Date    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:@"M/d"];    //Format Time    NSDateFormatter *timeFormatter = [[NSDateFormatter alloc] init];    [timeFormatter setDateFormat:@"h:ma"];    //define barcode Types to Recognize    AVMetadataMachineReadableCodeObject *barCodeObject;    Nsstring *IDNumber = nil;    NSArray *barCodeTypes = @[AVMetadataObjectTypeCode39Code];    if ([MetadataObjects count] > 1) {        NSLog(@"%lu barcodes Found.",(unsigned long)[MetadataObjects count]);    }    //Get String Value For Every barcode (That Matches The Type We're Looking For)    for (AVMetadataObject *Metadata in MetadataObjects) {        for (Nsstring *type in barCodeTypes) {            //If The barcode Is The Type We Need Then Get Data            if ([Metadata.type isEqualToString:type]) {                barCodeObject = (AVMetadataMachineReadableCodeObject *)[scannerPrevIEwLayer transformedMetadataObjectForMetadataObject:(AVMetadataMachineReadableCodeObject *)Metadata];                laser = barCodeObject.bounds;                IDNumber = [(AVMetadataMachineReadableCodeObject *)Metadata stringValue];                break;            }        }        // If IDNumber Found        if (IDNumber != nil) {            //Stop Session            [scannerSession stopRunning];            [self vibrate];            NSLog(@"ID: %@",IDNumber);            break;        }        //If IDNumber Is Not Found        else {            NSLog(@"No ID Found.");        }    }    //Update Laser    laserVIEw.frame = laser;}

解决方法 尝试放大一点… vIDeoDevice.vIDeoZoomFactor = 2.0; 总结

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