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原生的二维码

分类: 文章 • 2024-07-25 09:53:10
第一步：添加代理<AVCaptureMetadataOutputObjectsDelegate>
第二步：完整代码；

{
    NSTimer *timer;
}
//1.初始化捕捉设备（AVCaptureDevice），类型为AVMediaTypeVideo
@property (strong, nonatomic) AVCaptureDevice *captureDevice;
//2.用captureDevice创建输入流
@property (strong, nonatomic) AVCaptureDeviceInput *input;
//3.创建媒体数据输出流
@property (strong, nonatomic) AVCaptureMetadataOutput *output;
//捕捉会话
@property (strong, nonatomic) AVCaptureSession *session;
//展示layer
@property ( strong, nonatomic) AVCaptureVideoPreviewLayer *previewLayer;


//处理
@property (strong, nonatomic) UIView *boxView;//扫描框
@property (strong, nonatomic) CALayer *scanLayer;//运动的线
@property (strong, nonatomic) UIView *viewPreview;//展示layer层

@end

@implementation QrCodeController

#pragma mark - get
#pragma mark -初始化捕捉设备
- (AVCaptureDevice *)captureDevice{
   
    if (!_captureDevice) {
       
        _captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
       
    }
    return _captureDevice;
}

#pragma mark -创建输入流
- (AVCaptureDeviceInput *)input{
    if (!_input) {
        _input = [AVCaptureDeviceInput deviceInputWithDevice:self.captureDevice error:nil];
    }
    return _input;
}


/*
 *AVCaptureMetadataOutput 中的属性rectOfInterest 看起来是CGRect类型, 实际上是填写一个比例。加入屏幕的frame 为 x , y, w, h, 要设置的扫描区域的frame 为 x1, y1, w1, h1. 那么rectOfInterest 应该设置为 CGRectMake(y1/x, x1/y, h1/h, w1/w)。
 *
 */
#pragma mark -创建媒体数据输出流
- (AVCaptureMetadataOutput *)output{
    if (!_output) {
        _output = [[AVCaptureMetadataOutput alloc] init];
        CGRect viewFrame = self.viewPreview.frame;
       
        CGRect boxFrame = self.boxView.frame;
       
        CGFloat x = boxFrame.origin.y/viewFrame.origin.x;
        CGFloat y = boxFrame.origin.x/viewFrame.origin.y;
        CGFloat width = boxFrame.size.height/viewFrame.size.height;
        CGFloat height = boxFrame.size.width/viewFrame.size.width;
       
        _output.rectOfInterest = CGRectMake(x, y, width, height);
       
    }
    return _output;
}


#pragma mark -捕捉会话
- (AVCaptureSession *)session{
    if (!_session) {
        _session = [[AVCaptureSession alloc] init];
    }
    return _session;
}


#pragma mark -实例化预览图层
- (AVCaptureVideoPreviewLayer *)previewLayer
{
    if (!_previewLayer) {
        _previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
        //设置预览图层填充方式
        [_previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
    }
    return _previewLayer;
}


#pragma mark -预览层
- (UIView *)viewPreview{
    if (!_viewPreview) {
        _viewPreview = [[UIView alloc]initWithFrame:CGRectMake(0, NavBarHeight, SCREEN_WIDTH, SCREEN_HEIGHT - NavBarHeight)];
       
        _viewPreview.backgroundColor = [UIColor blueColor];
       
    }
   
    return _viewPreview;
   
}



#pragma mark -扫描框
- (UIView *)boxView{
    if (!_boxView){
     
        _boxView = [[UIView alloc]initWithFrame:CGRectMake(50, 100, SCREEN_WIDTH - 100, 240)];
        _boxView.layer.masksToBounds = YES;
        _boxView.layer.borderColor = [UIColor greenColor].CGColor;
        _boxView.layer.borderWidth = 1;
    }
    return _boxView;
}

#pragma mark -扫描线
- (CALayer *)scanLayer{
   
    if (!_scanLayer) {
    
        _scanLayer = [[CALayer alloc]init];
        _scanLayer .frame = CGRectMake(0, 0, self.boxView.bounds.size.width, 2);
        _scanLayer.backgroundColor = [UIColor greenColor].CGColor;
    }
   
    return _scanLayer;
   
}
- (void)viewDidLoad {
    [super viewDidLoad];
   
    self.navBar.titleLabel.text = @"二维码";
   
   
    [self startScaning];
   
    // Do any additional setup after loading the view.
}

#pragma mark -开始扫描
- (void)startScaning{
   
    // 1.判断输入能否添加到会话中
    if (![self.session canAddInput:self.input]) {
        return;
    }
   
    [self.session addInput:self.input];
   
    // 2.判断输出能够添加到会话中
    if (![self.session canAddOutput:self.output]) {
        return;
    }
    [self.session addOutput:self.output];
   
   
    // 3.设置监听监听输出解析到的数据
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
   
    //4.设置输出媒体数据类型为QRCode
    /*****************************************************
     二维码和条形码要分开来写
     如果是二维码
     [captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];
     如果条形码
     [captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, nil]];
     */
   
    [self.output setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];
   
    //5.预览层
    [self.view addSubview:self.viewPreview];
   
    self.previewLayer.frame = self.viewPreview.layer.bounds;
    [self.viewPreview.layer addSublayer:self.previewLayer];
   
   
    //6.扫描框
    [self.viewPreview addSubview:self.boxView];
   
    //7.扫描线
    [self.boxView.layer addSublayer:self.scanLayer];
   
   
    timer = [NSTimer scheduledTimerWithTimeInterval:0.2f target:self selector:@selector(moveScanLayer:) userInfo:nil repeats:YES];
   
    [timer fire];
   
   
    //11.开始扫描
    [self.session startRunning];
}



-(void)stopReading
{
    [_session stopRunning];
    _session = nil;
   
    if (timer.isValid) {
        [timer invalidate];
        timer=nil;
    }
   
    [_scanLayer removeFromSuperlayer];
    [_boxView removeFromSuperview];
    [_previewLayer removeFromSuperlayer];
    [_viewPreview removeFromSuperview];

}




#pragma mark   - AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    NSString *urlStr;
   
    //判断是否有数据
    if (metadataObjects != nil && [metadataObjects count] > 0) {
        AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];
        //判断回传的数据类型
        if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) {
           
            urlStr = metadataObj.stringValue;
           
            NSLog(@"%@",urlStr);
           
            [self performSelectorOnMainThread:@selector(stopReading) withObject:nil waitUntilDone:YES];
        }
    }
}



#pragma mark - 修改那条线的位置关系
- (void)moveScanLayer:(NSTimer *)timer
{
    CGRect frame = _scanLayer.frame;
    if (_boxView.frame.size.height == _scanLayer.frame.origin.y) {
        frame.origin.y = 0;
        _scanLayer.frame = frame;
    }else{
        frame.origin.y += 5;
        if (frame.origin.y > _boxView.frame.size.height) {
            frame.origin.y = _boxView.frame.size.height;
        }
       
        [UIView animateWithDuration:0.1 animations:^{
           
            _scanLayer.frame = frame;
        }];
    }
}


最后：运行效果：
原生的二维码 <AVFoundation/AVFoundation.h>

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