iOS自带原生二维码扫描的实现

前言

首先说明的是：原生的二维码扫描有一个坑，那就是扫描范围的确定。只要记得扫描范围是X与Y互换位置，W与H互换位置，就没有什么问题了。

下面进入正题：

1.因为使用原生二维码扫描，所以需要加入头文件添加delegate

#import <AVFoundation/AVFoundation.h>
<AVCaptureMetadataOutputObjectsDelegate>

2.接着是使用到的类

@property (strong,nonatomic)AVCaptureDevice * device;
@property (strong,nonatomic)AVCaptureDeviceInput * input;
@property (strong,nonatomic)AVCaptureMetadataOutput * output;
@property (strong,nonatomic)AVCaptureSession * session;
@property (weak, nonatomic) IBOutlet UIView *outputView;//xib中扫描的View
@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;
@property (strong, nonatomic) NSTimer * timer;//为了做扫描动画的定时器
@property (strong, nonatomic) UIImageView * lineImage;//扫描动画的横线

3.懒加载一个扫描动画的图片

-(UIImageView *)lineImage{
 if (!_lineImage) {
  CGFloat outputW = self.outputView.frame.size.width;
  _lineImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0,outputW, 2)];
  _lineImage.image = [UIImage imageNamed:@"ray"];
 }
 return _lineImage;
}

4.使用前的设置，我将它设置在了viewDidLoad当中

-viewDidLoad{
[super viewDidLoad];
 // Device
 _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

 // Input
 _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];

 // Output
 _output = [[AVCaptureMetadataOutput alloc]init];
 [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

 // Session
 _session = [[AVCaptureSession alloc]init];
 [_session setSessionPreset:AVCaptureSessionPresetHigh];
 //连接输入和输出
 if ([_session canAddInput:self.input])
 {
  [_session addInput:self.input];
 }

 if ([_session canAddOutput:self.output])
 {
  [_session addOutput:self.output];
 }
//设置条码类型
 _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

 //设置条码位置
 CGFloat X = (ScreenW/2-100)/ScreenW;
 CGFloat Y = (ScreenH/2-100)/ScreenH;
 CGFloat W = 200/ScreenW;
 CGFloat H = 200/ScreenH;
 //设置扫描范围（注意，X与Y交互，W与H交换）
 [_output setRectOfInterest:CGRectMake(Y, X, H, W)];
//添加扫描画面
 _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
 _preview.videoGravity =AVLayerVideoGravityResizeAspectFill;
 _preview.frame = CGRectMake(0, 0, ScreenW, ScreenH);//self.view.layer.bounds;
 [self.view.layer insertSublayer:_preview atIndex:0];
 //开始扫描
 [_session startRunning];

//添加扫描动画定时器
[self.outputView addSubview:self.lineImage];
 // Do any additional setup after loading the view from its nib.
 _timer = [NSTimer scheduledTimerWithTimeInterval:2.5f
           target:self
           selector:@selector(lineAction)
           userInfo:nil
           repeats:YES];
}

5.二维码扫描的代理事件

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
 NSString *stringValue;
 if ([metadataObjects count] >0){
  //停止扫描
  [_session stopRunning];
  AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
  stringValue = metadataObject.stringValue;//stringValue是扫描拿到的内容，更具内容进行后续工作。
 }
}

6.添加扫描动画的事件

- (void)lineAction{
 CGFloat outputW = self.outputView.frame.size.width;
 CGFloat outputH = self.outputView.frame.size.height;
 [UIView animateWithDuration:2.4f animations:^{
  CGRect frame = CGRectMake(0, outputH, outputW, 2);
  self.lineImage.frame = frame;
 } completion:^(BOOL finished) {
  CGRect frame = CGRectMake(0, 0, outputW, 2);
  self.lineImage.frame = frame;
 }];
}

搞定......最后放上一张效果图

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流。

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