iOS识别二维码

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环境:Xcode 7.3

目的:扫描识别二维码、条形码


1、引入Foundation框架

#import <AVFoundation/AVFoundation.h>


2、设置全局变量

@interface ViewController () <AVCaptureMetadataOutputObjectsDelegate>@property (strong,nonatomic)AVCaptureDevice * device; // 摄像头@property (strong,nonatomic)AVCaptureDeviceInput * input; // 获取视频数据@property (strong,nonatomic)AVCaptureMetadataOutput * output; // 输出视频数据@property (strong,nonatomic)AVCaptureSession * session; // 拍照@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview; // 显示图像View@end


3、初始化

// device    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    // input    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];    // output    self.output = [[AVCaptureMetadataOutput alloc] init];    // 扫描窗口位置大小,即有效识别区域(原点位于屏幕右上角,x、y位置互调,width、height位置互调,即frame=(y x,height widght),默认frame=(0 0, 1 1),x、y、width、height均为百分比,0~1之间。详见底部参考1)    [self.output setRectOfInterest:CGRectMake((ckHeight - ckScanLabelWidth) / 2 / ckHeight, (ckWidth - ckScanLabelWidth) / 2 / ckWidth, ckScanLabelWidth / ckHeight, ckScanLabelWidth / ckWidth)];    // 说明:使用主线程队列,相应比较同步,使用其他队列,相应不同步,容易让用户产生不好的体验    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];        // session    self.session = [[AVCaptureSession alloc] init];    [self.session setSessionPreset:AVCaptureSessionPresetHigh];    if ([self.session canAddInput:self.input]) {                [self.session addInput:self.input];    }        if ([self.session canAddOutput:self.output]){                [self.session addOutput:self.output];    }    // 设置输出的格式    // 提示:一定要先设置会话的输出为output之后,再指定输出的元数据类型!    // AVMetadataObjectTypeQRCode:二维码    self.output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil];        // preView    self.preview = [AVCaptureVideoPreviewLayer layerWithSession:self.session];    self.preview.videoGravity = AVLayerVideoGravityResizeAspectFill;    self.preview.frame = self.view.bounds;    [self.view.layer insertSublayer:self.preview atIndex:0];        // start    [self.session startRunning];


4、实现代理

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {        NSString * stringValue = [NSString string];    if ([metadataObjects count] >0) {        //停止扫描        [self.session stopRunning];                AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];        stringValue = metadataObject.stringValue;        NSLog(@"%@",stringValue);    }}


5、跳转应用


参考:

1、http://www.tuicool.com/articles/6jUjmur

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