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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。
在使用的类中
来自: blog.csdn.net/hello_hwc
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
// // 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
// // 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
// // 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
来自: blog.csdn.net/hello_hwc