二维码，条形码扫描？看我就够了

先上Demo地址

上效果图

未命名.gif

该效果基于OC原生语言写出，下边步入正题

二维码，条形码扫描，肯定会用到相机，但是苹果说了，你用我相机要通知用户权限，不然不给用。所以，先添加plist相机权限

cap.png

当前界面一个是用到系统原生类AVCaptureSession。创建会话，AVCaptureVideoPreviewLayer摄像头预览功能，当然还有一系列代理方法。中间挖空的视图同时存在一个线条动画。

首先我们要考虑一个问题，权限问题。如果用户自己点拒绝了，下次怎么搞。这里我在每次视图将要显示的时候做了一个处理

07E32E54-F63B-4553-8C58-F1A1BACC0BA6.png

-(void)viewWillAppear:(BOOL)animated{
    
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    switch (status) {
        case AVAuthorizationStatusNotDetermined:{
            // 许可对话没有出现，发起授权许可
            
            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                
                dispatch_async(dispatch_get_main_queue(), ^{
                    if (granted) {
                        //第一次用户接受
                    }else{
                        //用户拒绝
                        [self ocrOnFail:@"用户拒绝授权，无法扫描"];
                        
                        [self.navigationController popViewControllerAnimated:YES];
                    }
                });
            }];
            break;
        }
        case AVAuthorizationStatusAuthorized:{
            // 已经开启授权，可继续
            
            break;
        }
        default:
            break;
    }
    NSString * mediaType = AVMediaTypeVideo;// 媒体权限
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];// 读取设备权限
    if (authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied) {// 用户明确地拒绝授权，或者相机设备无法访问
        
        self.noneCameraPermissionsBlock();
        
        [self.navigationController popViewControllerAnimated:YES];
        return;
    }
    if (!_captureSession.running)
    {
        [self startReading];
        
    }
}

以上是权限问题解决。下边创建我们的会话，以及视图扫描工具

image.png

#import 
#import 

typedef void(^CKUniversityBlock)(NSString * contents);
typedef void(^CKNoPermissionsBlock)();

@interface NXZCodeViewController : UIViewController
{
    //会话
    AVCaptureSession *_captureSession;
    //摄像头预览
    AVCaptureVideoPreviewLayer *_videoPreviewLayer;
}

@property (nonatomic,assign)BOOL qrcodeFlag ;
@property (nonatomic,copy) CKUniversityBlock wenhuiUniversityConfirmBlock;
@property (nonatomic,copy) CKNoPermissionsBlock noneCameraPermissionsBlock;

@end

.m创建

- (BOOL)startReading {
    NSError *error;
    //硬件设备
    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    //输入源
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
    
    if (!input) {
        return NO;
    }
    
    //会话
    _captureSession = [[AVCaptureSession alloc] init];
    
    //将输入源添加到会话里
    [_captureSession addInput:input];
    
    //输出源-元数据的output
    AVCaptureMetadataOutput *captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init];
    
    //将输出添加到会话中
    [_captureSession addOutput:captureMetadataOutput];
    
    //创建队列
    dispatch_queue_t dispatchQueue;
    dispatchQueue = dispatch_queue_create("myQueue", NULL);
    //给output设置代理,并添加队列
    [captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatchQueue];
    captureMetadataOutput.rectOfInterest = CGRectMake(((SCREEN_HEIGHT-64) / 2 - 220 / 2 -40)/SCREEN_HEIGHT, (SCREEN_WIDTH / 2 - 220 / 2)/SCREEN_WIDTH, 220/SCREEN_HEIGHT, 220/SCREEN_WIDTH);
    captureMetadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeInterleaved2of5Code,AVMetadataObjectTypeUPCECode];
    
    //视频预览图层
    _videoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];
    
    [_videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
    
    
    [_videoPreviewLayer setFrame:self.view.layer.bounds];
    [self.view.layer insertSublayer:_videoPreviewLayer atIndex:0];
    [self configuredZBarReaderMaskView];
    [_qrRectView startScan];
    
    //开始运行会话
    [_captureSession startRunning];
    
    return YES;
}

别忘记设计代理回调奥，要不那不到我们要的扫描结果的

AVCaptureMetadataOutputObjectsDelegate

image.png

#pragma mark - AVCaptureMetadataOutputObjectsDelegate
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects
      fromConnection:(AVCaptureConnection *)connection
{
    [_captureSession stopRunning];
    [_qrRectView stopScan];
    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"%@/n%@",metadataObjects,connection);
        if (metadataObjects != nil && [metadataObjects count] > 0)
        {
            
            AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];
            NSLog(@"%@",metadataObj.stringValue);
            NSString *msgStr=metadataObj.stringValue;
            //@"http://qr.bookln.cn/qr.html?crcode=110000000F00000000000000B3ZX1CEC"
            [self ocrOnFail:msgStr];
            
            
        }else{
            [self ocrOnFail:@"扫描失败"];
            [self.navigationController popViewControllerAnimated:YES];
            return;
        }
        
    });
    
}
- (void)ocrOnFail:(NSString *)error {
    NSLog(@"%@", error);
    NSString *msg = [NSString stringWithFormat:@"%@", error];
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"识别信息" message:msg preferredStyle:UIAlertControllerStyleActionSheet];
        UIAlertAction * action = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            [_captureSession startRunning];
            [_qrRectView startScan];
        }];
        [alert addAction:action];
        [self presentViewController:alert animated:YES completion:nil];
    }];
    [_captureSession stopRunning];
}

到此，当前视图的扫描基本就满足我们扫描二维码和条形码的需求了。但是中间镂空的动画视图呢？在那里。。。

别着急，我们下边创建中间镂空的视图，并添加动画效果

自定义一个View继承UIView

image.png

@interface QRView : UIView

/**
 *  透明的区域
 */
@property (nonatomic, assign) CGSize transparentArea;

- (void)startScan;
- (void)stopScan;

@end

.m方法

创建线条图片，

image.png

    if(!_line){
        _line  = [[UIImageView alloc] init];
        _line.image = [UIImage imageNamed:@"QRCodeScanLine"];
        [_line setBackgroundColor:[UIColor clearColor]];
        _line.contentMode = UIViewContentModeScaleAspectFill;
        [self addSubview:_line];
    }
}

四个边添加，并且镂空，这里用到CGContextRef，不会的同学可自行百度，讲解很详细

image.png

- (void)addCornerLineWithContext:(CGContextRef)ctx rect:(CGRect)rect{
    
    //画四个边角
    CGContextSetLineWidth(ctx, 2);
    CGContextSetRGBStrokeColor(ctx, 52 /255.0, 152/255.0, 219/255.0, 1);//蓝色
    
    //左上角
    CGPoint poinsTopLeftA[] = {
        CGPointMake(rect.origin.x+0.7, rect.origin.y),
        CGPointMake(rect.origin.x+0.7 , rect.origin.y + 15)
    };
    
    CGPoint poinsTopLeftB[] = {CGPointMake(rect.origin.x, rect.origin.y +0.7),CGPointMake(rect.origin.x + 15, rect.origin.y+0.7)};
    [self addLine:poinsTopLeftA pointB:poinsTopLeftB ctx:ctx];
    
    //左下角
    CGPoint poinsBottomLeftA[] = {CGPointMake(rect.origin.x+ 0.7, rect.origin.y + rect.size.height - 15),CGPointMake(rect.origin.x +0.7,rect.origin.y + rect.size.height)};
    CGPoint poinsBottomLeftB[] = {CGPointMake(rect.origin.x , rect.origin.y + rect.size.height - 0.7) ,CGPointMake(rect.origin.x+0.7 +15, rect.origin.y + rect.size.height - 0.7)};
    [self addLine:poinsBottomLeftA pointB:poinsBottomLeftB ctx:ctx];
    
    //右上角
    CGPoint poinsTopRightA[] = {CGPointMake(rect.origin.x+ rect.size.width - 15, rect.origin.y+0.7),CGPointMake(rect.origin.x + rect.size.width,rect.origin.y +0.7 )};
    CGPoint poinsTopRightB[] = {CGPointMake(rect.origin.x+ rect.size.width-0.7, rect.origin.y),CGPointMake(rect.origin.x + rect.size.width-0.7,rect.origin.y + 15 +0.7 )};
    [self addLine:poinsTopRightA pointB:poinsTopRightB ctx:ctx];
    
    CGPoint poinsBottomRightA[] = {CGPointMake(rect.origin.x+ rect.size.width -0.7 , rect.origin.y+rect.size.height+ -15),CGPointMake(rect.origin.x-0.7 + rect.size.width,rect.origin.y +rect.size.height )};
    CGPoint poinsBottomRightB[] = {CGPointMake(rect.origin.x+ rect.size.width - 15 , rect.origin.y + rect.size.height-0.7),CGPointMake(rect.origin.x + rect.size.width,rect.origin.y + rect.size.height - 0.7 )};
    [self addLine:poinsBottomRightA pointB:poinsBottomRightB ctx:ctx];
    CGContextStrokePath(ctx);
}

- (void)addLine:(CGPoint[])pointA pointB:(CGPoint[])pointB ctx:(CGContextRef)ctx {
    CGContextAddLines(ctx, pointA, 2);
    CGContextAddLines(ctx, pointB, 2);
}

绘制

image.png

- (void)drawRect:(CGRect)rect {
    
    //整个二维码扫描界面的颜色
    CGSize viewSize =self.bounds.size;
    CGRect screenDrawRect =CGRectMake(0, 0, viewSize.width,viewSize.height);
    
    //中间清空的矩形框
    CGRect clearDrawRect = CGRectMake(screenDrawRect.size.width / 2 - self.transparentArea.width / 2,
                                      screenDrawRect.size.height / 2 - self.transparentArea.height / 2 -40,
                                      self.transparentArea.width,self.transparentArea.height);
    
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [self addScreenFillRect:ctx rect:screenDrawRect];
    
    [self addCenterClearRect:ctx rect:clearDrawRect];
    
    [self addWhiteRect:ctx rect:clearDrawRect];
    
    [self addCornerLineWithContext:ctx rect:clearDrawRect];
    
    
}

当然了，我们调用这个镂空框是要一句话调用开启动画，一句话调用结束动画的，所以我们开出两个方法

- (void)startScan;
- (void)stopScan;

.m实现

image.png

- (void)startScan{
    if(_line){
        isStop = NO;
        if(nil == _line.superview){
            [self addSubview:_line];
        }
        [self startAnimation];
    }
}

- (void)stopScan{
    isStop = YES;
    [_line removeFromSuperview];
}

调用很方便的，

image.png

/**
 *自定义扫描二维码视图样式
 *@param 初始化扫描二维码视图的子控件
 */
- (void)configuredZBarReaderMaskView{
    //扫描的矩形方框视图
    _qrRectView = [[QRView alloc] init];
    _qrRectView.transparentArea = CGSizeMake(220, 220);
    _qrRectView.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.7];
    [self.view addSubview:_qrRectView];
    [_qrRectView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view).with.offset(0);
        make.left.equalTo(self.view).with.offset(0);
        make.right.equalTo(self.view).with.offset(0);
        make.bottom.equalTo(self.view).with.offset(0);
    }];
    
    self.topDetailLabel.hidden = NO;
    self.topDetailLabel.text = @"请将二维码/条形码放入框中即可自动扫描";
    self.topDetailLabel.center = CGPointMake(SCREEN_WIDTH/2, 100*OffHeight);
    self.topDetailLabel.bounds = CGRectMake(0, 0, SCREEN_WIDTH, 10*OffHeight);
    [_qrRectView addSubview:self.topDetailLabel];
    //照明按钮
    _lightingBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [_lightingBtn setTitle:@"打开照明" forState:UIControlStateNormal];
    [_lightingBtn setImage:[UIImage imageNamed:@"CJKTLightingImage"] forState:UIControlStateNormal];
    [_lightingBtn.titleLabel setFont:[UIFont systemFontOfSize:10]];
    
    
    [_lightingBtn setImageEdgeInsets:UIEdgeInsetsMake(0, 0, -20, 0)];
    [_lightingBtn setTitleEdgeInsets:UIEdgeInsetsMake(93, -50, 0, 0)];
    [_lightingBtn setTitleColor:[UIColor uiColorFromString:@"#c2c2c2"] forState:UIControlStateNormal];
    [_lightingBtn setBackgroundColor:[UIColor clearColor]];
    _lightingBtn.tag = LIGHTBUTTONTAG;
    captureIs_Select = NO;
    [_lightingBtn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
    [_qrRectView addSubview:_lightingBtn];
    [_lightingBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.bottom.equalTo(_qrRectView).with.offset(-100*OffHeight);
        make.centerX.equalTo(_qrRectView);
        make.size.mas_equalTo(CGSizeMake(50, 70));
    }];
    
}

这个代码量有点多，考虑封装性，大家有需要可以自己将view代码挪出去即可。

也可根据自己需求来私人定制属于自己的扫描软件奥。

Demo地址