#import "ViewController.h" #import <AVFoundation/AVFoundation.h> @interface ViewController () <AVCaptureMetadataOutputObjectsDelegate> @property (nonatomic, weak) AVCaptureSession *session; @property (nonatomic, weak) AVCaptureVideoPreviewLayer *layer; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { // 1.创建捕捉会话 AVCaptureSession *session = [[AVCaptureSession alloc] init]; self.session = session; // 2.添加输入设备(数据从摄像头输入) AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; [session addInput:input]; // 3.添加输出数据(示例对象-->类对象-->元类对象-->根元类对象) AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init]; [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [session addOutput:output]; // 3.1.设置输入元数据的类型(类型是二维码数据) [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]]; // 4.添加扫描图层 AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session]; layer.frame = self.view.bounds; [self.view.layer addSublayer:layer]; self.layer = layer; // 5.开始扫描 [session startRunning]; } #pragma mark - 实现output的回调方法 // 当扫描到数据时就会执行该方法 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { if (metadataObjects.count > 0) { AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject]; NSLog(@"%@", object.stringValue); // 停止扫描 [self.session stopRunning]; // 将预览图层移除 [self.layer removeFromSuperlayer]; } else { NSLog(@"没有扫描到数据"); } } @end
时间: 2024-11-05 22:38:47