iOS掃描有很多非常成熟的第三方應用,從iOS7以後開始支援原生掃描二維碼,而且效率非常高,整合也很簡單.下面我們來寫下原生掃描方法.直接上圖.swfit 版本.

    var device: AVCaptureDevice!
    var input: AVCaptureDeviceInput!
    var output: AVCaptureMetadataOutput!
    var session: AVCaptureSession!
    var preView: AVCaptureVideoPreviewLayer!
 

下面是配置方法:

func configDeviceVideo() -> Void {
        
        
        device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo);
        input = try? AVCaptureDeviceInput(device: device);
        
        output = AVCaptureMetadataOutput();
        
        output.setMetadataObjectsDelegate(self, queue: .main);

        session = AVCaptureSession();
        if session.canSetSessionPreset(AVCaptureSessionPresetHigh){
            session.sessionPreset = AVCaptureSessionPresetHigh;
        }
        if session.canAddInput(input) {
            session.addInput(input);
        }
        if session.canAddOutput(output){
            session.addOutput(output);
        }
        output.metadataObjectTypes = output.availableMetadataObjectTypes;
        preView = AVCaptureVideoPreviewLayer(session: session);
        preView.videoGravity = AVLayerVideoGravityResizeAspectFill;
        preView.frame = self.view.bounds;
        self.view.layer.addSublayer(preView);
    }
 

1.output.MetadataObjectsDelegate代理需要實現.

2.output.metadataObjectTypes = output.availableMetadataObjectTypes

這個方法必須寫在session.addOutput(output);的後面.否則會出錯.

最後一個方法:

session.startRunning();

最後有一句重要的話.要匯入AVFoundation這個框架.