iOS 开发AVFoundation系统原生二维码扫描实现

/* 先在项目中导入AVFoundation.framework框架 */ #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface QRViewController : UIViewController {/*** AVCaptureSession：AVFoundation中的核心类，用于通过硬件获取、处理和输出视频。一个Capture Session由多个输入和多个输出组成，并控制输出帧的格式和分辨率。AVCaptureVideoPreviewLayer：用于显示摄像头捕捉到得视频到UI。*/AVCaptureSession *_captureSession;AVCaptureVideoPreviewLayer *_previewLayer; }#import "QRViewController.h" #define Width self.view.frame.size.width #define Height self.view.frame.size.height @interface QRViewController ()<AVCaptureMetadataOutputObjectsDelegate> {int num;BOOL upOrdown;NSTimer *timer;//自定义界面UIImageView *imageView;UIButton *scanButton;UILabel *labIntroudction;UIImageView *line; } @end@implementation QRViewController- (void)viewDidLoad {[super viewDidLoad];_previewLayer.frame = self.view.frame;[self initWith];[self setupCaptureSession];[self.view addSubview:scanButton];[self.view addSubview:labIntroudction];[self.view addSubview:imageView];upOrdown = NO;num =0;timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];}//自定义界面- (void)initWith {scanButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];[scanButton setTitle:@"取消" forState:UIControlStateNormal];scanButton.frame = CGRectMake(50, Height - 200, Width - 100, 50);scanButton.backgroundColor = [[UIColor blackColor]colorWithAlphaComponent:0.5];[scanButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake(50, 100, Width - 100, 50)];labIntroudction.numberOfLines = 0;labIntroudction.textColor=[UIColor whiteColor];labIntroudction.text=@"将二维码图像置于矩形方框内，离手机摄像头10CM左右，系统会自动识别。";labIntroudction.font = [UIFont systemFontOfSize:16.0];labIntroudction.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pick_bg.png"]];imageView.frame = CGRectMake(40, 170, Width - 80, Width - 80);_line = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, imageView.frame.size.width - 20, 2)];_line.image = [UIImage imageNamed:@"line.png"];[imageView addSubview:_line];self.view.backgroundColor = [UIColor clearColor];}-(void)animation {if (upOrdown == NO) {num ++;_line.frame = CGRectMake(10, 10 + 2*num, imageView.frame.size.width - 20, 2);if (2*num == CGRectGetHeight(imageView.frame) - 20) {upOrdown = YES;}}else {num --;_line.frame = CGRectMake(10, 10 + 2*num, imageView.frame.size.width - 20, 2);if (num == 0) {upOrdown = NO;}}} -(void)backAction {[self dismissViewControllerAnimated:YES completion:^{[timer invalidate];}]; }/*** 这个方法用于建立capture session。如果session已经存在，则直接返回。初始化video device，若设备没有摄像头，则直接返回。初始化capture session。通过video device创建video input。查询session是否接受一个输入，如果接受，添加输入到session中。最后，创建预览层并为其指定要预览的capture session。*/ - (void)setupCaptureSession {if (_captureSession) return;/*AVCaptureDevice：封装设备上的物理摄像头。对iPhone而言有前后两个摄像头。AVCaptureDeviceInput：要添加一个AVCaptureDevice到session中，需要用AVCaptureDeviceInput来包裹一下。*/// 首先我们应该判断当前设备是否有捕获数据流的设备。AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];if (!videoDevice) {NSLog(@"No video camera on this device!");return;}AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];//初始化一个 CaptureSession对象_captureSession = [[AVCaptureSession alloc] init];//设置会话的输入设备if ([_captureSession canAddInput:input]){[_captureSession addInput:input];}//对应输出AVCaptureMetadataOutput *captureMetadataOutput = [[ AVCaptureMetadataOutput alloc] init];[_captureSession addOutput:captureMetadataOutput];//设置扫描区域[captureMetadataOutput setRectOfInterest:CGRectMake(imageView.frame.origin.y/ Height ,imageView.frame.origin.x/ Width , imageView.frame.size.width / Height, imageView.frame.size.height / Width)];//创建一个队列dispatch_queue_t metadataQueue = dispatch_queue_create("myQueue", 0);[captureMetadataOutput setMetadataObjectsDelegate:self queue:metadataQueue];[captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];if([_captureSession canAddOutput:captureMetadataOutput]){[_captureSession addOutput:captureMetadataOutput];}// 降捕获的数据流展现出来_previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;[_previewLayer setFrame:self.view.layer.bounds];[self.view.layer addSublayer:_previewLayer];// 开始捕获[ _captureSession startRunning];}- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {// 判断是否有数据，是否是二维码数据if (metadataObjects != nil && [metadataObjects count] > 0) {AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];//获得扫描的数据，并结束扫描[self dismissViewControllerAnimated:YES completion:^{[timer invalidate];if(metadataObj.stringValue && [metadataObj.stringValue rangeOfString:@"http:"].location != NSNotFound){NSString *regex = @"http+:[^\\s]*";NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];// 正则表达式判断 是否包含 http:if ([predicate evaluateWithObject:metadataObj.stringValue]){// 判断是不是我们自己的二维码if ([metadataObj.stringValue rangeOfString:@"http://m.pinlehuo.com/api.php"].location != NSNotFound) {NSLog(@"-------%@", metadataObj.stringValue);}else{[[UIApplication sharedApplication]openURL:[NSURL URLWithString:metadataObj.stringValue]];}}} else {NSLog(@"symbol.data = %@", metadataObj.stringValue);}}]; } }@end

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