今天，我為大家介紹一下iOS原生API實現二維碼和條形碼掃描功能

主要程式碼如下

//獲取攝像裝置
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //建立輸入流
    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    //建立輸出流
    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
    //設定代理 在主執行緒裡重新整理
 

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

    //初始化連結物件
    session = [[AVCaptureSession alloc]init];
    //高質量採集率
    [session setSessionPreset:AVCaptureSessionPresetHigh];

    [session addInput:input];
    [session addOutput:output];
    //設定掃碼支援的編碼格式(如下設定條形碼和二維碼相容)
 

    output.metadataObjectTypes[email protected][AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];

    AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:session];
    layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
    layer.frame
 
=self.layer.bounds;
    [self.layer insertSublayer:layer atIndex:0];
    //開始捕獲
    [session startRunning];

    //掃描的範圍
    output.rectOfInterest=CGRectMake(0,0,1.0, 1.0);