ios系统扫描二维码（二维码扫描器ios版）

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

1 2	`#import` `<AVFoundation/AVFoundation.h>` `<AVCaptureMetadataOutputObjectsDelegate>`

2.接着是使用到的类

1 2 3 4 5 6 7 8 @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

1 2 3 4 5 6 7 8 -(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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 -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

1 2 3 4 5 6 7 8 9 10 -(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

1 2 3 4 5 6 7 8 9 10 11 - (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; }]; }