iOS7提供的API进行二维码扫描解码

01.<code style="margin:0px;padding:0px;border:0px;vertical-align:baseline;font-family:Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">- (void)initCameraLayer

02. 

03.{

04. 

05._session = [[AVCaptureSession alloc] init];

06. 

07.[self.session setSessionPreset:AVCaptureSessionPresetHigh];;

08. 

09. 

10. 

11.AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

12. 

13. 

14. 

15.NSError *error;

16. 

17.AVCaptureDeviceInput* deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];

18. 

19.if ([self.session canAddInput:deviceInput]) {

20. 

21.[self.session addInput:deviceInput];

22. 

23.}

24. 

25. 

26. 

27.if (error) {

28. 

29.NSLog(@"error: %@", error.description);

30. 

31.}

32. 

33. 

34. 

35.AVCaptureMetadataOutput* output = [[AVCaptureMetadataOutput alloc] init];

36. 

37.[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

38. 

39.if ([self.session canAddOutput:output]) {

40. 

41.[self.session addOutput:output];

42. 

43.}

44. 

45. 

46. 

47.// 条码类型

48. 

49.//    output.metadataObjectTypes = @[AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeAztecCode];

50. 

51. 

52. 

53.output.metadataObjectTypes = @[AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeCode128Code];

54. 

55. 

56. 

57._previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];

58. 

59.[self.previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

60. 

61.CALayer *rootLayer = self.rootScanView.layer;

62. 

63.[rootLayer setMasksToBounds:YES];

64. 

65.[rootLayer insertSublayer:self.previewLayer atIndex:0];

66. 

67. 

68. 

69.[self.previewLayer setFrame:self.rootScanView.bounds];

70. 

71.[self.previewLayer.connection setVideoOrientation:AVCaptureVideoOrientationPortrait];

72. 

73.}</code>

view source

print?

01.- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection

02. 

03.{

04. 

05.NSString *stringValue;

06. 

07. 

08. 

09.if ([metadataObjects count] > 0) {

10. 

11.AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];

12. 

13.stringValue = metadataObject.stringValue;

14. 

15.NSLog(@"string value....%@", stringValue);

16. 

17.}

18. 

19.}