二维码的完整代码

0

1

注意：本篇文章采用了IOS7的新特性来扫二维码，所以系统支持要IOS7以上，如果要兼容IOS7之前的版本，自行找库来支持。

为了方便，我把扫二维码简单封装到了一个UIView中，用代理的方式返回值

在使用之前，应当为工程添加AVFoundation.framework

最后实现的效果如图

完整的实现代码

头文件

?

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

// //  HwcScanQRView.h //  HwcAnimationExample // //  Created by huangwenchen on 15/1/7. //  Copyright (c) 2015年 huangwenchen. All rights reserved. //   #import <UIKit/UIKit.h>   @protocol HwcScanQRDelegate <NSObject> /*! * @discussion Delegate method when scan QR successed * @param QRContent Scan result * @return Void */   -(void)DidGetScanWithResult:(NSString *)QRContent; /*!  * @discussion Delegate method when scan QR failed  * @param error Error message  * @return Void  */ -(void)DidFailToScanWithError:(NSError *)error; @end   @interface HwcScanQRView : UIView @property id<HwcScanQRDelegate> delegate; @property(nonatomic,readonly) bool isScaning; -(BOOL)startScaning; -(void)stop; @end

.m文件

?

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 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

// //  HwcScanQRView.m //  HwcAnimationExample // //  Created by huangwenchen on 15/1/7. //  Copyright (c) 2015年 huangwenchen. All rights reserved. //   #import "HwcScanQRView.h" #import  <AVFoundation/AVFoundation.h> @interface HwcScanQRView()<AVCaptureMetadataOutputObjectsDelegate>   @property(nonatomic,readwrite) bool isScaning; @property(strong,nonatomic)AVCaptureSession * captureSession; @property(strong,nonatomic)AVCaptureVideoPreviewLayer * vedioPreviewLayer; @end   @implementation HwcScanQRView   #pragma mark - Propertys -(AVCaptureSession *)captureSession{     if (!_captureSession) {         _captureSession = [[AVCaptureSession alloc] init];     }     return  _captureSession; }   -(AVCaptureVideoPreviewLayer *)vedioPreviewLayer{     if (!_vedioPreviewLayer) {         _vedioPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];     }     return _vedioPreviewLayer; } #pragma mark - QRScan function -(BOOL)startScaning{     NSError * error;     AVCaptureDevice * captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];     AVCaptureDeviceInput * deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];     if (!deviceInput) {         if ([self.delegate respondsToSelector:@selector(DidFailToScanWithError:)]) {             [self.delegate DidFailToScanWithError:error];         }         return NO;     }     [self.captureSession addInput:deviceInput];     AVCaptureMetadataOutput * captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init];     [self.captureSession addOutput:captureMetadataOutput];     dispatch_queue_t scanQRqueue;     scanQRqueue = dispatch_queue_create("scanQRqueue",DISPATCH_QUEUE_SERIAL);     [captureMetadataOutput setMetadataObjectsDelegate:self queue:scanQRqueue];     [captureMetadataOutput setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];     [self.vedioPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];     [self.vedioPreviewLayer setFrame:self.layer.bounds];     [self.layer addSublayer:self.vedioPreviewLayer];     [self.captureSession startRunning];     return YES; } -(void)stop{     [self.captureSession stopRunning];     self.isScaning = NO;     self.captureSession = nil;     [_vedioPreviewLayer removeFromSuperlayer]; } #pragma mark - AVFoundation delegate method -(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {     if (metadataObjects != nil && metadataObjects.count > 0) {         AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects firstObject];         if ([[metadataObject type] isEqualToString:AVMetadataObjectTypeQRCode]) {             NSString * scanResult = [metadataObject stringValue];             dispatch_async(dispatch_get_main_queue(), ^{                 if ([self.delegate respondsToSelector:@selector(DidGetScanWithResult:)]) {                     [self.delegate DidGetScanWithResult:scanResult];                 }             });         }     } }   @end

在使用的类中

?

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

// //  ViewController.m //  HwcAnimationExample // //  Created by huangwenchen on 15/1/6. //  Copyright (c) 2015年 huangwenchen. All rights reserved. //   #import "ViewController.h" #import "HwcScanQRView.h" @interface ViewController ()<HwcScanQRDelegate>//这里实现代理 @property (strong,nonatomic)UILabel * scanresultLabel; @end   @implementation ViewController   - (void)viewDidLoad {     [super viewDidLoad];     HwcScanQRView * scanView = [[HwcScanQRView alloc] initWithFrame:CGRectMake(100,100,200, 200)];     scanView.delegate = self;//这一步必须的     [self.view addSubview:scanView];     self.scanresultLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 320, 200, 30)];     [self.view addSubview:self.scanresultLabel];     [scanView startScaning];//不要忘记开始扫描 } //两个代理方法 -(void)DidGetScanWithResult:(NSString *)QRContent{     self.scanresultLabel.text = QRContent; } -(void)DidFailToScanWithError:(NSError *)error{     NSLog(@"%@",error.localizedDescription); }   @end