二维码扫描

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原创最新推荐文章于 2026-05-14 11:21:46 发布 492 阅读 AI 写同款· GEO 优化 ›

unity之制作二维码扫描要生成二维码需要使用zxing.unity.dll提取码syq1在unity中创建Plugins文件夹，将dll放入此文件夹中我这里使用的unity版本是2019.4.32。阅读详情

// 先要导入 AVFoundation.framework

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
//1.有个素材
@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>

//2.输入设备  采集摄像头捕捉到信息
@property (nonatomic, strong) AVCaptureDeviceInput *input;
//3.输出设备  解析输入设备采集到的信息
@property (nonatomic, strong) AVCaptureMetadataOutput *output;
//4.layer (特殊图层 能够展示摄像头采集到画面)  展示输入设备采集到的信息
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;
//5.关联输入设备和输出设备 : 会话
@property (nonatomic, strong) AVCaptureSession *session;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //1.创建输入设备
    //AVCaptureDevice 设备 :  摄像头(video) 麦克风(audio)
    //AVCaptureDeviceInput 输入设备 default 默认后置
    //AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSArray *allDevice = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

    self.input = [AVCaptureDeviceInput deviceInputWithDevice:[allDevice firstObject] error:nil];

    //2.创建输出设备
    self.output = [[AVCaptureMetadataOutput alloc]init];
    //解析 ->  返回数据
    //https://www.douniwan.com

    //设置输出设备的代理  返回解析后的数据
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    //3.创建会话
    self.session = [[AVCaptureSession alloc]init];

    //4.关联 会话跟设备
    if ([self.session canAddInput:self.input]) {
        [self.session addInput:self.input];
    }
    if ([self.session canAddOutput:self.output]) {
        [self.session addOutput:self.output];
    }


    //告诉数据类型 AVMetadataObjectTypeQRCode 二维码
    self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];


    //扫描框大小
    [self.session setSessionPreset:AVCaptureSessionPresetHigh];

    //5.指定layer 的frame  然后添加到View上
    self.layer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];
    self.layer.frame = self.view.bounds;
    [self.view.layer addSublayer:self.layer];

    //6.开启会话
    [self.session startRunning];

}
//扫描出结果之后就会调用
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{

    AVMetadataMachineReadableCodeObject *objc = [metadataObjects firstObject];
    NSString *str = objc.stringValue;

    NSLog(@"%@",str);
    //
    //停止扫描
    [self.session stopRunning];
    //移除layer
    [self.layer removeFromSuperlayer];

}

@end