iOS7 AVFoundation 二维码扫瞄

iOS7，AVFoundation中现在已经内置支持一维和二维码的扫瞄，iOS6及之前的想要扫瞄二维码，还是需要添加第三方库ZXing和ZBar。

ZBar生成二维码：/article/10756664.html

先添加AVFoundation.framework

#import <AVFoundation/AVFoundation.h>

@interface QRcodeViewController :UIViewController<AVCaptureMetadataOutputObjectsDelegate>

@property (strong,nonatomic)AVCaptureDevice *device;

@property (strong,nonatomic)AVCaptureDeviceInput *input;

@property (strong,nonatomic)AVCaptureMetadataOutput *output;

@property (strong,nonatomic)AVCaptureSession *session;

@property (strong,nonatomic)AVCaptureVideoPreviewLayer
*preview;

@end

- (void)setupCamera
{

// Device

self.device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

// Input

self.input = [AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];

// Output

self.output = [[AVCaptureMetadataOutputalloc]init];

[self.outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

// Session

self.session = [[AVCaptureSessionalloc]init];

[self.sessionsetSessionPreset:AVCaptureSessionPresetHigh];
if ([self.sessioncanAddInput:self.input])
{
[self.sessionaddInput:self.input];
}
if ([self.sessioncanAddOutput:self.output])
{
[self.sessionaddOutput:self.output];
}

//
条码类型

self.output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

// Preview

self.preview = [AVCaptureVideoPreviewLayerlayerWithSession:self.session];

self.preview.videoGravity =AVLayerVideoGravityResizeAspectFill;

self.preview.frame =CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);

[self.view.layeraddSublayer:self.preview];

// Start

[self.sessionstartRunning];
}

条码类型有如下几种：

1 2 3 4 5 6 7 8 9 10

AVMetadataObjectTypeUPCECode AVMetadataObjectTypeCode39Code AVMetadataObjectTypeCode39Mod43Code AVMetadataObjectTypeEAN13Code AVMetadataObjectTypeEAN8Code AVMetadataObjectTypeCode93Code AVMetadataObjectTypeCode128Code AVMetadataObjectTypePDF417Code AVMetadataObjectTypeQRCode AVMetadataObjectTypeAztecCode

扫瞄到二维码之后，会调用delegate

#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray
*)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;

if ([metadataObjectscount] >0) {
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjectsobjectAtIndex:0];
stringValue = metadataObject.stringValue;
}

[_sessionstopRunning];

[selfdismissViewControllerAnimated:YEScompletion:^{
UIAlertView *alert = [[UIAlertViewalloc]initWithTitle:nil
message:stringValue
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil,nil];
[alertshow];
}];
}

这个委托方法里面的字符串stringValue就是二维码的内容