iOS 原生二维码扫描（可限制扫描区域）

最新推荐文章于 2025-08-13 16:19:20 发布

原创

最新推荐文章于 2025-08-13 16:19:20 发布 · 358 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#ios #二维码 #扫描区域 #特殊layer

这里写图片描述

废话不多说,直接上代码

**先声明几个类**
@interface QRCodeController ()<AVCaptureMetadataOutputObjectsDelegate>

@property(nonatomic,strong)AVCaptureDeviceInput *input;
@property(nonatomic,strong)AVCaptureMetadataOutput *output;
@property(nonatomic,strong)AVCaptureSession *session;
@property(nonatomic,strong)AVCaptureVideoPreviewLayer *prelayer;
@end

- (void)instanceDevice{

    line_tag = 1872637;
    //获取摄像设备
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //创建输入流
    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    //创建输出流
    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
    //设置扫描区域,很简单被很多人忽略的属性,注意这是是按比例计算的!!!
    CGSize size = self.view.bounds.size;
    CGRect cropRect = CGRectMake(40, 180, 240, 240);
    output.rectOfInterest = CGRectMake(cropRect.origin.y/size.height,
                                              cropRect.origin.x/size.width,
                                              cropRect.size.height/size.height,
                                              cropRect.size.width/size.width);
    //设置代理 在主线程里刷新
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    //初始化链接对象
    self.session = [[AVCaptureSession alloc]init];
    //高质量采集率
    [self.session setSessionPreset:AVCaptureSessionPresetHigh];
    if (input) {
        [self.session addInput:input];
    }
    if (output) {
        [self.session addOutput:output];
        //设置扫码支持的编码格式(如下设置条形码和二维码兼容)
        NSMutableArray *a = [[NSMutableArray alloc] init];
        if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {