iOS二维码识别/二维码生成

最新推荐文章于 2023-08-12 16:00:07 发布

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最新推荐文章于 2023-08-12 16:00:07 发布 · 置顶 · 814 阅读

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CC 4.0 BY-SA版权

文章标签：

#iOS #识别 #二维码图片 #生成二维码图片 #iOS 二维码

文章目录

前言

最近在做一个关于二维码的组件，已发布，现总结下。
开发的APP所需支持的最低版本为7.0，最初的方案为扫描使用苹果自带的API实现扫一扫的功能、使用ZXing识别从相册或别人转发的二维码图片。但发现ZXing识别从相册中来的图片性能很差，很多图片识别不了，且耗时较长，遂使用ZBar来实现识别从相册或别人转发的二维码图片。
这个组件重要有三个功能，扫一扫识别二维码图片、长按图片识别二维码图片和生成二维码图片。

扫一扫识别二维码图片

- (void)initCapture {
   
   
    AVCaptureDevice* inputDevice =
    [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    [inputDevice lockForConfiguration:nil];
    if ([inputDevice hasTorch]) {
   
   
        inputDevice.torchMode = AVCaptureTorchModeAuto;
    }
    [inputDevice unlockForConfiguration];
    
    AVCaptureDeviceInput *captureInput =
    [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil];
    
    if (!captureInput) {
   
   
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) {
   
   
            UIAlertController *alterVC = [UIAlertController alertControllerWithTitle:@"系统提示" message:@"您已关闭相机使用权限，请至手机“设置->隐私->相机”中打开" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
            [alterVC addAction:confirmAction];
            [self presentViewController:alterVC animated:YES completion:nil];
            
        } else {
   
   
            UIAlertController *alterVC = [UIAlertController alertControllerWithTitle:@"系统提示" message:@"未能找到相机设备" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
            [alterVC addAction:confirmAction];
            [self presentViewController:alterVC animated:YES completion:nil];
        }
        return;
    }
    
    AVCaptureMetadataOutput *captureOutput = [[AVCaptureMetadataOutput alloc] init];
    [captureOutput setMetadataObjectsDelegate:self queue:_queue];
    self.captureOutput = captureOutput;
    self.captureSession = [[AVCaptureSession alloc] init];
    [self.captureSession addInput:captureInput];
    [self.captureSession addOutput:captureOutput];
    
    CGFloat w = 1920.f;
    CGFloat h = 1080.f;
    if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1920x1080]) {
   
   
        self.captureSession.sessionPreset = AVCaptureSessionPreset1920x1080;
    } else if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
   
   
        self.captureSession.sessionPreset = AVCaptureSessionPreset1280x720;
        w = 1280.f;
        h = 720.f;
    } else if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset640x480]) {
   
   
        self.captureSession.sessionPreset = AVCaptureSessionPreset640x480;
        w = 960.f;
        h = 540.f;
    }
    captureOutput.metadataObjectTypes = [captureOutput availableMetadataObjectTypes];
    CGRect bounds = [[UIScreen mainScreen] bounds];
    
    if (!self.prevLayer) {
   
   
        self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
    }
    self.prevLaye