iOS 原生二维码扫描（可限制扫描区域）

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]) {[a addObject:AVMetadataObjectTypeQRCode];}if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN13Code]) {[a addObject:AVMetadataObjectTypeEAN13Code];}if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeEAN8Code]) {[a addObject:AVMetadataObjectTypeEAN8Code];}if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeCode128Code]) {[a addObject:AVMetadataObjectTypeCode128Code];}output.metadataObjectTypes=a;}//创建特殊的现实layerAVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];self.prelayer = layer;layer.videoGravity=AVLayerVideoGravityResizeAspectFill;layer.frame=self.view.layer.bounds;[self.view.layer insertSublayer:layer atIndex:0];//调用创建扫码页面方法[self setOverlayPickerView];//给session添加一个观察者[self.session addObserver:self forKeyPath:@"running" options:NSKeyValueObservingOptionNew context:nil];//开始捕获[self.session startRunning];
}

监听扫码状态-修改扫描动画

- (void)observeValueForKeyPath:(NSString *)keyPathofObject:(id)objectchange:(NSDictionary *)changecontext:(void *)context{if ([object isKindOfClass:[AVCaptureSession class]]) {BOOL isRunning = ((AVCaptureSession *)object).isRunning;if (isRunning) {[self addAnimation];}else{[self removeAnimation];}}
}

* 获取扫码结果*

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{if (metadataObjects.count>0) {[self.session stopRunning];AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex :0];//输出扫描字符串NSString *data = metadataObject.stringValue;
//创建第一个提示窗窗口UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:data preferredStyle:(UIAlertControllerStyleAlert)];UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {//我自己加的方法,点击"好"后,将推出的模态窗口推出[self selfRemoveFromSuperview];}];[alertController addAction:okAction];[self presentViewController:alertController animated:YES completion:nil];}
}

创建扫码界面,为了简单我没有设置自动布局,就按6S手机适配的

- (void)setOverlayPickerView
{//左侧的viewUIImageView *leftView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 30, ScreenHeight)];
//    UIImageView *leftView = [[UIImageView alloc] init];leftView.alpha = 0.5;leftView.backgroundColor = [UIColor blackColor];[self.view addSubview:leftView];
//    [leftView mas_makeConstraints:^(MASConstraintMaker *make) {//        make.left.equalTo(self.view.mas_left);
//        make.top.equalTo(self.view.mas_top);
//        make.width.mas_equalTo(100);
//        make.height.mas_equalTo(ScreenHeight);
//    }];//右侧的viewUIImageView *rightView = [[UIImageView alloc] initWithFrame:CGRectMake(ScreenWidth-30, 0, 30, ScreenHeight)];rightView.alpha = 0.5;rightView.backgroundColor = [UIColor blackColor];[self.view addSubview:rightView];//最上部viewUIImageView* upView = [[UIImageView alloc] initWithFrame:CGRectMake(30, 0, ScreenWidth-60, (self.view.center.y-(ScreenWidth-60)/2))];upView.alpha = 0.5;upView.backgroundColor = [UIColor blackColor];[self.view addSubview:upView];//底部viewUIImageView * downView = [[UIImageView alloc] initWithFrame:CGRectMake(30, (self.view.center.y+(ScreenWidth-60)/2), (ScreenWidth-60), (ScreenHeight-(self.view.center.y-(ScreenWidth-60)/2)))];downView.alpha = 0.5;downView.backgroundColor = [UIColor blackColor];[self.view addSubview:downView];UIImageView *centerView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth-60, ScreenWidth-60)];centerView.center = self.view.center;centerView.image = [UIImage imageNamed:@"扫描框.png"];centerView.contentMode = UIViewContentModeScaleAspectFit;centerView.backgroundColor = [UIColor clearColor];[self.view addSubview:centerView];UIImageView *line = [[UIImageView alloc] initWithFrame:CGRectMake(30, CGRectGetMaxY(upView.frame), ScreenWidth-60, 2)];line.tag = line_tag;line.image = [UIImage imageNamed:@"扫描线.png"];line.contentMode = UIViewContentModeScaleAspectFill;line.backgroundColor = [UIColor clearColor];[self.view addSubview:line];UILabel *msg = [[UILabel alloc] initWithFrame:CGRectMake(30, CGRectGetMinY(downView.frame), ScreenWidth-60, 60)];msg.backgroundColor = [UIColor clearColor];msg.textColor = [UIColor whiteColor];msg.textAlignment = NSTextAlignmentCenter;msg.font = [UIFont systemFontOfSize:16];msg.text = @"将二维码放入框内,即可自动扫描";[self.view addSubview:msg];UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, ScreenHeight-100, ScreenWidth, 100)];label.backgroundColor = [UIColor clearColor];label.textColor = [UIColor whiteColor];label.textAlignment = NSTextAlignmentCenter;label.font = [UIFont systemFontOfSize:24];label.text = @"世界那么大,我想去扫扫";[self.view addSubview:label];CGRect leftFrame;leftFrame = CGRectMake(0, 10, 60, 64);UIButton *leftButton= [UIButton buttonWithType:UIButtonTypeCustom];leftButton.frame =leftFrame;[leftButton addTarget:self action:@selector(dismissOverlayView:) forControlEvents:UIControlEventTouchUpInside];[leftButton setImage:[UIImage imageNamed:@"白色返回_想去"] forState:UIControlStateNormal];[self.view addSubview:leftButton];
}

添加扫码动画

- (void)addAnimation{UIView *line = [self.view viewWithTag:line_tag];line.hidden = NO;CABasicAnimation *animation = [QRCodeController moveYTime:2 fromY:[NSNumber numberWithFloat:0] toY:[NSNumber numberWithFloat:ScreenWidth-60-2] rep:OPEN_MAX];[line.layer addAnimation:animation forKey:@"LineAnimation"];
}+ (CABasicAnimation *)moveYTime:(float)time fromY:(NSNumber *)fromY toY:(NSNumber *)toY rep:(int)rep
{CABasicAnimation *animationMove = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];[animationMove setFromValue:fromY];[animationMove setToValue:toY];animationMove.duration = time;animationMove.delegate = self;animationMove.repeatCount  = rep;animationMove.fillMode = kCAFillModeForwards;animationMove.removedOnCompletion = NO;animationMove.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];return animationMove;
}

去除扫码动画

- (void)removeAnimation{UIView *line = [self.view viewWithTag:line_tag];[line.layer removeAnimationForKey:@"LineAnimation"];line.hidden = YES;
}

将推出的模态控制器移除

- (void)selfRemoveFromSuperview{[self.prelayer removeFromSuperlayer];[self dismissViewControllerAnimated:YES completion:nil];
}//修改状态栏样式
- (UIStatusBarStyle)preferredStatusBarStyle{return UIStatusBarStyleLightContent;
}

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