cocos2dx-lua在ios上实现生成及扫描二维码
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首先说明下，我是支持用ios原生方法实现的。不过扫描二维码原生方法不支持ios7.0之前的设备，所以生成二维码用的原生方法实现，而扫描二维码用zBar sdk实现的(当然也可以用google官方的zXing sdk)。其中zBar中包含生成二维码的方法，而且更多样，我只是喜欢尽量用原生方法来实现。
这里我把所有生成二维码的代码和lua调用的扫描二维码方法都放在了项目->frameworks->runtime-src->proj.ios_mac->ios->AppController.h和AppController.mm中
而zBar sdk及相关类放到了 项目->frameworks->runtime-src->proj.ios_mac->ios下。
-----1.原生生成二维码
------------1.1AppController.h中添加代码：
//生成二维码+(CIImage *) creatQRcodeWithUrlstring:(NSString *)urlString;//改变图片大小 (正方形图片)+ (UIImage *)changeImageSizeWithCIImage:(CIImage *)ciImage andSize:(CGFloat)size;//保存(暂时没用)+(BOOL)writeImage:(UIImage*)image toFileAtPath:(NSString*)aPath;//生成二维码+(void)createQRCode:(NSDictionary *)info;------------1.2AppController.mm中添加代码：
/** * 根据字符串生成二维码 CIImage 对象 * * @param urlString 需要生成二维码的字符串 * * @return 生成的二维码 */+ (CIImage *)creatQRcodeWithUrlstring:(NSString *)urlString{ // 1.实例化二维码滤镜 CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; // 2.恢复滤镜的默认属性 (因为滤镜有可能保存上一次的属性) [filter setDefaults]; // 3.将字符串转换成NSdata NSData *data = [urlString dataUsingEncoding:NSUTF8StringEncoding]; // 4.通过KVO设置滤镜, 传入data, 将来滤镜就知道要通过传入的数据生成二维码 [filter setValue:data forKey:@"inputMessage"]; // 5.生成二维码 CIImage *outputImage = [filter outputImage]; return outputImage;}/** * 改变图片大小 (正方形图片) * * @param ciImage 需要改变大小的CIImage 对象的图片 * @param size 图片大小 (正方形图片 只需要一个数) * * @return 生成的目标图片 */+ (UIImage *)changeImageSizeWithCIImage:(CIImage *)ciImage andSize:(CGFloat)size{ CGRect extent = CGRectIntegral(ciImage.extent); CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); // 创建bitmap; size_t width = CGRectGetWidth(extent) * scale; size_t height = CGRectGetHeight(extent) * scale; CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray(); CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone); CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef bitmapImage = [context createCGImage:ciImage fromRect:extent]; CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone); CGContextScaleCTM(bitmapRef, scale, scale); CGContextDrawImage(bitmapRef, extent, bitmapImage); // 保存bitmap到图片 CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef); CGContextRelease(bitmapRef); CGImageRelease(bitmapImage); return [UIImage imageWithCGImage:scaledImage];}+ (BOOL)writeImage:(UIImage*)image toFileAtPath:(NSString*)aPath{ if ((image == nil) || (aPath == nil) || ([aPath isEqualToString:@""])) return NO; @try { NSData *imageData = nil; NSString *ext = [aPath pathExtension]; if ([ext isEqualToString:@"png"]) { imageData = UIImagePNGRepresentation(image); } else { // the rest, we write to jpeg // 0. best, 1. lost. about compress. imageData = UIImageJPEGRepresentation(image, 0); } if ((imageData == nil) || ([imageData length] <= 0)) return NO; [imageData writeToFile:aPath atomically:YES]; return YES; } @catch (NSException *e) { NSLog(@"create thumbnail exception."); } return NO;}/* * 项目-TARGETS-fightGame-mobile-Build Phases-Link Binary With Libraries添加CoreImage.framework */+(void) createQRCode:(NSDictionary *)info{ int _callBack = [[info objectForKey:@"listener"] intValue]; NSString *qrCodeStr = [info objectForKey:@"qrCodeStr"]; CIImage *ciImage = [self creatQRcodeWithUrlstring:qrCodeStr]; UIImage *uiImage = [self changeImageSizeWithCIImage:ciImage andSize:180]; NSData *imageData = UIImagePNGRepresentation(uiImage); std::string path = cocos2d::FileUtils::getInstance()->getWritablePath() + "qrCode.png"; const char* pathC = path.c_str(); NSString * pathN = [NSString stringWithUTF8String:pathC]; bool isSuccess = [imageData writeToFile:pathN atomically:YES]; cocos2d::LuaBridge::pushLuaFunctionById(_callBack); cocos2d::LuaValueDict dict; dict["isSuccess"] =cocos2d::LuaValue::booleanValue(isSuccess); cocos2d::LuaBridge::getStack()->pushLuaValueDict( dict ); cocos2d::LuaBridge::getStack()->executeFunction(1); cocos2d::LuaBridge::releaseLuaFunctionById(_callBack);}其中createQRcode方法为最终lua掉用oc的方法，将生成的图片存到cocos2dx的writablePath下,并保存为"qrCode.png"。最后在lua端取出用sprite显示。
------------1.3lua调用createQRcode方法，并显示
local callBack = function (message) local filePath = cc.FileUtils:getInstance():getWritablePath() filePath = filePath.."qrCode.png" local rect = cc.rect(0, 0, 180, 180) local sprite = cc.Sprite:create() sprite:initWithFile(filePath, rect) sprite:setPosition(300, 300) self:addChild(sprite) end local info = {listener = callBack, qrCodeStr = "https://www.baidu.com/"} luaoc.callStaticMethod("AppController", "createQRCode", info)------------1.4添加CoreImage.framework依赖框架(二维码扫描需要用到)项目->TARGETS->Build Phases->Link Binary With Libraries->左下角“+”号，search框中输入CoreImage.framework，选择匹配的选项即可。
-----2.zBar sdk实现二维码扫描
------------2.1下载zBar sdk
地址在后面给出。
------------2.2将zBarSDK解压并将解压后的zBarSDK导入到工程项目->frameworks->runtime-src->proj.ios_mac->ios下。
解压后的zBarSDK目录包含：Headers,libzbar.a,Resources。
如果导入工程后没有自动添加libzbar.a依赖框架，则需要手动添加该依赖框架(如1.4)。
------------2.3项目->frameworks->runtime-src->proj.ios_mac->ios->zBarSDK下新建ZCZBarViewController.h和ZCZBarViewController.mm两个文件，并导入工程，代码如下。
------------2.4ZCZBarViewController.h代码：
/* 版本说明 iOS研究院 305044955 1.8版本 剔除生成二维码文件，使用iOS7原生生成二维码 1.7版本 修复了开启相机点击，用户如果点击拒绝，会导致崩溃的问题 1.6版本 增加了支持了区别条码和二维码，可以关闭扫描二维码来增加条码扫描速度 1.5版本 修正了iOS6下扫描会卡死，增加了iOS7下支持条形码,修改了算法，增加了效率 1.4版本 支持iOS8系统，修改了相应UI的适配问题 1.3版本 全新支持arm7s arm64 全新支持ARC 1.2版本 ZC封装的ZBar二维码SDK 1、更新类名从CustomViewController更改为ZCZBarViewController 2、删除掉代理的相关代码 1.1版本 ZC封装的ZBar二维码SDK~ 1、增加block回调 2、取消代理 3、增加适配IOS7（ios7在AVFoundation中增加了扫描二维码功能） 1.0版本 ZC封装的ZBar二维码SDK~1.0版本初始建立 二维码编译顺序 Zbar编译 需要添加AVFoundation CoreMedia CoreVideo QuartzCore libiconv //示例代码扫描代码BOOL代表是否关闭二维码扫描，专门扫描条形码 ZCZBarViewController*vc=[[ZCZBarViewController alloc]initWithIsQRCode:NO Block:^(NSString *result, BOOL isFinish) { if (isFinish) { NSLog(@"最后的结果%@",result); } }]; [self presentViewController:vc animated:YES completion:nil]; 生成二维码 [ZCZBarViewController createImageWithImageView:imageView String:@"http://www.baidu.com"Scale:4]; */#import <UIKit/UIKit.h>#import <AVFoundation/AVFoundation.h>#import "ZBarReaderController.h"#import <CoreImage/CoreImage.h>#define IOS7 [[[UIDevice currentDevice] systemVersion]floatValue]>=7@interface ZCZBarViewController : UIViewController<AVCaptureVideoDataOutputSampleBufferDelegate, UINavigationControllerDelegate, UIImagePickerControllerDelegate,ZBarReaderDelegate,AVCaptureMetadataOutputObjectsDelegate>{ int num; BOOL upOrdown; NSTimer * timer; UIImageView*_line;}@property (nonatomic,strong) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;@property (nonatomic, strong) AVCaptureSession *captureSession;@property (nonatomic, assign) BOOL isScanning;@property (nonatomic,copy)void(^ScanResult)(NSString*result,BOOL isSucceed);@property (nonatomic)BOOL isQRCode;//初始化函数-(id)initWithIsQRCode:(BOOL)isQRCode Block:(void(^)(NSString*,BOOL))a;//正则表达式对扫描结果筛选+(NSString*)zhengze:(NSString*)str;//创建二维码+(void)createImageWithImageView:(UIImageView*)imageView String:(NSString*)str Scale:(CGFloat)scale;@end------------2.4ZCZBarViewController.mm代码：#import "ZCZBarViewController.h"#import <AssetsLibrary/AssetsLibrary.h>@interface ZCZBarViewController ()@end#define WIDTH ( ([UIScreen mainScreen].bounds.size.width>[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.width:[UIScreen mainScreen].bounds.size.height )//[UIScreen mainScreen].bounds.size.width#define HEIGHT ( ([UIScreen mainScreen].bounds.size.width<[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.width:[UIScreen mainScreen].bounds.size.height )//[UIScreen mainScreen].bounds.size.height@implementation ZCZBarViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self;}-(id)initWithIsQRCode:(BOOL)isQRCode Block:(void(^)(NSString*,BOOL))a{ if (self=[super init]) { self.ScanResult=a; self.isQRCode=isQRCode; } return self;}-(void)createView{ //qrcode_scan_bg_Green_iphone5@2x.png qrcode_scan_bg_Green@2x.png UIImage*image= [UIImage imageNamed:@"qrcode_scan_bg_Green@2x.png"]; float capWidth=image.size.width/2; float capHeight=image.size.height/2; image=[image stretchableImageWithLeftCapWidth:capWidth topCapHeight:capHeight]; UIImageView* bgImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, WIDTH, HEIGHT-64)]; //bgImageView.contentMode=UIViewContentModeTop; bgImageView.clipsToBounds=YES; bgImageView.image=image; bgImageView.userInteractionEnabled=YES; [self.view addSubview:bgImageView]; // UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(0, bgImageView.frame.size.height-140, WIDTH, 40)];// label.text = @"将取景框对准二维码，即可自动扫描。";// label.textColor = [UIColor whiteColor];// label.textAlignment = NSTextAlignmentCenter;// label.lineBreakMode = NSLineBreakByWordWrapping;// label.numberOfLines = 2;// label.font=[UIFont systemFontOfSize:12];// label.backgroundColor = [UIColor clearColor];// [bgImageView addSubview:label]; _line = [[UIImageView alloc] initWithFrame:CGRectMake((WIDTH-220)/2, 70, 220, 2)]; _line.image = [UIImage imageNamed:@"qrcode_scan_light_green.png"]; [bgImageView addSubview:_line]; // //下方相册// UIImageView*scanImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, HEIGHT-100, WIDTH, 100)];// scanImageView.image=[UIImage imageNamed:@"qrcode_scan_bar.png"];// scanImageView.userInteractionEnabled=YES;// [self.view addSubview:scanImageView];// NSArray*unSelectImageNames=@[@"qrcode_scan_btn_photo_nor.png",@"qrcode_scan_btn_flash_nor.png",@"qrcode_scan_btn_myqrcode_nor.png"];// NSArray*selectImageNames=@[@"qrcode_scan_btn_photo_down.png",@"qrcode_scan_btn_flash_down.png",@"qrcode_scan_btn_myqrcode_down.png"];// // for (int i=0; i<unSelectImageNames.count; i++) {// UIButton*button=[UIButton buttonWithType:UIButtonTypeCustom];// [button setImage:[UIImage imageNamed:unSelectImageNames[i]] forState:UIControlStateNormal];// [button setImage:[UIImage imageNamed:selectImageNames[i]] forState:UIControlStateHighlighted];// button.frame=CGRectMake(WIDTH/3*i, 0, WIDTH/3, 100);// [scanImageView addSubview:button];// if (i==0) {// [button addTarget:self action:@selector(pressPhotoLibraryButton:) forControlEvents:UIControlEventTouchUpInside];// }// if (i==1) {// [button addTarget:self action:@selector(flashLightClick) forControlEvents:UIControlEventTouchUpInside];// }// if (i==2) {// button.hidden=YES;// }// // } //假导航// UIImageView*navImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, 64)];// navImageView.image=[UIImage imageNamed:@"qrcode_scan_bar.png"];// navImageView.userInteractionEnabled=YES;// [self.view addSubview:navImageView]; UILabel*titleLabel=[[UILabel alloc]initWithFrame:CGRectMake(WIDTH/2-32, 20, 64, 44)]; titleLabel.textColor=[UIColor whiteColor]; titleLabel.backgroundColor = [UIColor clearColor]; titleLabel.text=@"扫一扫"; [self.view addSubview:titleLabel];// [navImageView addSubview:titleLabel]; UIButton*button = [UIButton buttonWithType:UIButtonTypeCustom]; [button setImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_pressed@2x.png"] forState:UIControlStateHighlighted]; [button setImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_nor.png"] forState:UIControlStateNormal]; [button setFrame:CGRectMake(10,10, 48, 48)]; [button addTarget:self action:@selector(pressCancelButton:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(animation1) userInfo:nil repeats:YES];}-(void)animation1{ [UIView animateWithDuration:2 animations:^{ _line.frame = CGRectMake((WIDTH-220)/2, 70+HEIGHT-310, 220, 2); }completion:^(BOOL finished) { [UIView animateWithDuration:2 animations:^{ _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); }]; }]; }//开启关闭闪光灯-(void)flashLightClick{ AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if (device.torchMode==AVCaptureTorchModeOff) { //闪光灯开启 [device lockForConfiguration:nil]; [device setTorchMode:AVCaptureTorchModeOn]; }else { //闪光灯关闭 [device setTorchMode:AVCaptureTorchModeOff]; }}- (void)viewDidLoad{ //相机界面的定制在self.view上加载即可 BOOL Custom= [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];//判断摄像头是否能用 if (Custom) { [self initCapture];//启动摄像头 }else{ self.view.backgroundColor=[UIColor whiteColor]; } [super viewDidLoad]; [self createView]; }#pragma mark 选择相册- (void)pressPhotoLibraryButton:(UIButton *)button{ if (timer) { [timer invalidate]; timer=nil;} _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.allowsEditing = YES; picker.delegate = self; picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentViewController:picker animated:YES completion:^{ self.isScanning = NO; [self.captureSession stopRunning]; }];}#pragma mark 点击取消- (void)pressCancelButton:(UIButton *)button{ self.isScanning = NO; [self.captureSession stopRunning]; self.ScanResult(nil,NO); if (timer) { [timer invalidate]; timer=nil; } _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; [self dismissViewControllerAnimated:YES completion:nil];}#pragma mark 开启相机- (void)initCapture{ //ios6上也没有“设置--隐私--相机” 那一项 if (IOS7) { NSString *mediaType = AVMediaTypeVideo; AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType]; if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){ NSString*str=[NSString stringWithFormat:@"请在系统设置－%@－相机中打开允许使用相机", [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleNameKey]]; UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"提示" message:str delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil]; [alert show]; return; } } self.captureSession = [[AVCaptureSession alloc] init]; AVCaptureDevice* inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil]; [self.captureSession addInput:captureInput]; AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init]; captureOutput.alwaysDiscardsLateVideoFrames = YES; if (IOS7) { AVCaptureMetadataOutput*_output=[[AVCaptureMetadataOutput alloc]init]; [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [self.captureSession setSessionPreset:AVCaptureSessionPresetHigh]; [self.captureSession addOutput:_output]; //在这里修改了，可以让原生兼容二维码和条形码，无需在使用Zbar if (_isQRCode) { _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode]; }else{ _output.metadataObjectTypes =@[AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeQRCode]; } if (!self.captureVideoPreviewLayer) { self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; } // NSLog(@"prev %p %@", self.prevLayer, self.prevLayer); self.captureVideoPreviewLayer.frame = CGRectMake(0, 0, WIDTH, HEIGHT);//self.view.bounds; self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.captureVideoPreviewLayer]; self.isScanning = YES; [self.captureSession startRunning]; }else{ dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL); [captureOutput setSampleBufferDelegate:self queue:queue]; NSString* key = (NSString *)kCVPixelBufferPixelFormatTypeKey; NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]; NSDictionary *videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; [captureOutput setVideoSettings:videoSettings]; [self.captureSession addOutput:captureOutput]; NSString* preset = 0; if (NSClassFromString(@"NSOrderedSet") && // Proxy for "is this iOS 5" ... [UIScreen mainScreen].scale > 1 && [inputDevice supportsAVCaptureSessionPreset:AVCaptureSessionPresetiFrame960x540]) { // NSLog(@"960"); preset = AVCaptureSessionPresetiFrame960x540; } if (!preset) { // NSLog(@"MED"); preset = AVCaptureSessionPresetMedium; } self.captureSession.sessionPreset = preset; if (!self.captureVideoPreviewLayer) { self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; } // NSLog(@"prev %p %@", self.prevLayer, self.prevLayer); self.captureVideoPreviewLayer.frame = CGRectMake(0, 0, WIDTH, HEIGHT);//self.view.bounds; self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.captureVideoPreviewLayer]; self.isScanning = YES; [self.captureSession startRunning]; } }- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer{ CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); // Lock the base address of the pixel buffer CVPixelBufferLockBaseAddress(imageBuffer,0); // Get the number of bytes per row for the pixel buffer size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); // Get the pixel buffer width and height size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); // Create a device-dependent RGB color space CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); if (!colorSpace) { NSLog(@"CGColorSpaceCreateDeviceRGB failure"); return nil; } // Get the base address of the pixel buffer void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer); // Get the data size for contiguous planes of the pixel buffer. size_t bufferSize = CVPixelBufferGetDataSize(imageBuffer); // Create a Quartz direct-access data provider that uses data we supply CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, bufferSize, NULL); // Create a bitmap image from data supplied by our data provider CGImageRef cgImage = CGImageCreate(width, height, 8, 32, bytesPerRow, colorSpace, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little, provider, NULL, true, kCGRenderingIntentDefault); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace); // Create and return an image object representing the specified Quartz image UIImage *image = [UIImage imageWithCGImage:cgImage]; return image;}#pragma mark 对图像进行解码- (void)decodeImage:(UIImage *)image{ self.isScanning = NO; ZBarSymbol *symbol = nil; ZBarReaderController* read = [ZBarReaderController new]; read.readerDelegate = self; CGImageRef cgImageRef = image.CGImage; for(symbol in [read scanImage:cgImageRef])break; if (symbol!=nil) { if (timer) { [timer invalidate]; timer=nil; } _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; self.ScanResult(symbol.data,YES); [self.captureSession stopRunning]; [self dismissViewControllerAnimated:YES completion:nil]; }else{ timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation1) userInfo:nil repeats:YES]; num = 0; upOrdown = NO; self.isScanning = YES; [self.captureSession startRunning]; } }#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{ UIImage *image = [self imageFromSampleBuffer:sampleBuffer]; [self decodeImage:image];}#pragma mark AVCaptureMetadataOutputObjectsDelegate//IOS7下触发- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{ if (metadataObjects.count>0) { AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0]; self.ScanResult(metadataObject.stringValue,YES); } [self.captureSession stopRunning]; _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; [self dismissViewControllerAnimated:YES completion:nil]; }#pragma mark - UIImagePickerControllerDelegate- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{ if (timer) { [timer invalidate]; timer=nil; } _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; UIImage *image = [info objectForKey:@"UIImagePickerControllerEditedImage"]; [self dismissViewControllerAnimated:YES completion:^{[self decodeImage:image];}]; }- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{ if (timer) { [timer invalidate]; timer=nil; } _line.frame = CGRectMake((WIDTH-220)/2, 70, 220, 2); num = 0; upOrdown = NO; timer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(animation1) userInfo:nil repeats:YES]; [self dismissViewControllerAnimated:YES completion:^{ self.isScanning = YES; [self.captureSession startRunning]; }];}#pragma mark - DecoderDelegate+(NSString*)zhengze:(NSString*)str{ NSError *error; //http+:[^\\s]* 这是检测网址的正则表达式 NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"http+:[^\\s]*" options:0 error:&error];//筛选 if (regex != nil) { NSTextCheckingResult *firstMatch = [regex firstMatchInString:str options:0 range:NSMakeRange(0, [str length])]; if (firstMatch) { NSRange resultRange = [firstMatch rangeAtIndex:0]; //从urlString中截取数据 NSString *result1 = [str substringWithRange:resultRange]; NSLog(@"正则表达后的结果%@",result1); return result1; } } return nil;}+(void)createImageWithImageView:(UIImageView*)imageView String:(NSString*)str Scale:(CGFloat)scale{ CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; [filter setDefaults]; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; [filter setValue:data forKey:@"inputMessage"]; CIImage *outputImage = [filter outputImage]; CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef cgImage = [context createCGImage:outputImage fromRect:[outputImage extent]]; UIImage *image = [UIImage imageWithCGImage:cgImage scale:1.0 orientation:UIImageOrientationUp]; UIImage *resized = nil; CGFloat width = image.size.width*scale; CGFloat height = image.size.height*scale; UIGraphicsBeginImageContext(CGSizeMake(width, height)); CGContextRef context1 = UIGraphicsGetCurrentContext(); CGContextSetInterpolationQuality(context1, kCGInterpolationNone); [image drawInRect:CGRectMake(0, -50, width, height)]; resized = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); imageView.image = resized; CGImageRelease(cgImage);}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ // Get the new view controller using [segue destinationViewController]. // Pass the selected object to the new view controller.}*/////支持旋转//-(BOOL)shouldAutorotate{// return NO;//}////支持的方向//- (UIInterfaceOrientationMask)supportedInterfaceOrientations {// return UIInterfaceOrientationMaskPortrait;//}@end------------2.5AppController.h中添加代码：
//获取当前正在显示的ViewController+ (UIViewController *)getCurrentVC;//获取当前屏幕中present出来的viewcontroller。- (UIViewController *)getPresentedViewController;//扫描二维码+(void)scanQRCode:(NSDictionary *)info;------------2.5AppController.mm中添加代码：
//获取当前正在显示的ViewController+ (UIViewController *)getCurrentVC{ UIViewController *result = nil; UIWindow * window = [[UIApplication sharedApplication] keyWindow]; if (window.windowLevel != UIWindowLevelNormal) { NSArray *windows = [[UIApplication sharedApplication] windows]; for(UIWindow * tmpWin in windows) { if (tmpWin.windowLevel == UIWindowLevelNormal) { window = tmpWin; break; } } } UIView *frontView = [[window subviews] objectAtIndex:0]; id nextResponder = [frontView nextResponder]; if ([nextResponder isKindOfClass:[UIViewController class]]) result = nextResponder; else result = window.rootViewController; return result;}//获取当前屏幕中present出来的viewcontroller。- (UIViewController *)getPresentedViewController{ UIViewController *appRootVC = [UIApplication sharedApplication].keyWindow.rootViewController; UIViewController *topVC = appRootVC; if (topVC.presentedViewController) { topVC = topVC.presentedViewController; } return topVC;}+(void) scanQRCode:(NSDictionary *)info{ int _callBack = [[info objectForKey:@"listener"] intValue]; // SGScanningQRCodeVC *scanningQRCodeVC = [[SGScanningQRCodeVC alloc] init];// [scanningQRCodeVC setupScanningQRCode]; UIViewController *nowViewController = [self getCurrentVC]; ZCZBarViewController*vc=[[ZCZBarViewController alloc]initWithIsQRCode:NO Block:^(NSString *result, BOOL isFinish) { if (isFinish) { NSLog(@"最后的结果%@",result); UIViewController *nowViewController = [self getCurrentVC]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.02 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [nowViewController dismissViewControllerAnimated:NO completion:nil]; cocos2d::LuaBridge::pushLuaFunctionById(_callBack); cocos2d::LuaValueDict dict; dict["scanResult"] = cocos2d::LuaValue::stringValue([result UTF8String]); cocos2d::LuaBridge::getStack()->pushLuaValueDict(dict); cocos2d::LuaBridge::getStack()->executeFunction(1); cocos2d::LuaBridge::releaseLuaFunctionById(_callBack); }); } }]; [nowViewController presentViewController:vc animated:YES completion:nil];}其中scanQRCode方法为最终lua掉用oc的方法，在扫描识别出二维码信息之后会将信息传回给lua端。------------2.6lua掉用oc扫描二维码代码：
local callBack = function (message) print("message scanResult : ", message.scanResult) Utils.showTip(message.scanResult) end local info = {listener = callBack} luaoc.callStaticMethod("AppController", "scanQRCode", info)------------2.7添加依赖框架如上1.4，扫描二维码需要添加框架AVFoundation, CoreMedie, CoreVideo, QuartzCore, libiconv
-----3.扫描界面横竖屏说明
如果游戏界面是横屏的，而二维码扫描界面要求是竖屏的，则需要做些操作。
------------3.1增加竖屏支持
项目->TARGETS->General->Deployment Info->Device Orientation->勾选Portrait,Landscape Left, Landscape Right。
------------3.2让游戏界面只支持横屏
项目->frameworks->runtime-src->proj.ios_mac->ios->RootViewController.mm中supportedInterfaceOrientations方法修改为：
// For ios6, use supportedInterfaceOrientations & shouldAutorotate instead- (NSUInteger) supportedInterfaceOrientations{ return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;//#ifdef __IPHONE_6_0// return UIInterfaceOrientationMaskAllButUpsideDown;//#endif}------------3.3扫描二维码界面只支持竖屏项目->frameworks->runtime-src->proj.ios_mac->ios->ZCZBarViewController.mm中增加代码：
////支持旋转//-(BOOL)shouldAutorotate{// return NO;//}////支持的方向//- (UIInterfaceOrientationMask)supportedInterfaceOrientations {// return UIInterfaceOrientationMaskPortrait;//}------------3.4修改view界面width和height重新适配项目->frameworks->runtime-src->proj.ios_mac->ios->ZCZBarViewController.mm中将
#define WIDTH和#define HEIGHT两个宏的值颠倒下。
-----4.关于项目->frameworks->runtime-src->proj.ios_mac->ios->ZCZBarViewController.mm中#define WIDTH和#define HEIGHT两个宏本来因该是
#define WIDTH [UIScreen mainScreen].bounds.size.width
#define HEIGHT [UIScreen mainScreen].bounds.size.height
但在iphone4s(ios6.1.3)上取出的width和height为320, 480，而在iPhone6 Plus(ios10.2)上width和height为568, 320。一个宽小于高，一个宽大于高，使得4s横屏的时候，6Plus竖屏是对的，而在6Plus上横屏就是乱的。
所以后来将两个宏修改为(注意：两边一定要带括号，防止编译时宏展开后由于操作符优先级导致的运算错误)
#define WIDTH ( ([UIScreen mainScreen].bounds.size.width>[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.width:[UIScreen mainScreen].bounds.size.height )
#define HEIGHT ( ([UIScreen mainScreen].bounds.size.width<[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.width:[UIScreen mainScreen].bounds.size.height )
从而将宽固定取获得的二者较大值，高为二者较小值。若是竖屏，则反过来。
-----5.遇到的一些问题
------------5.1对于ZCZBarViewController.mm中的initCpture方法中有句
AVAuthorizationStatus authStatus = [AVCaptureDeviceauthorizationStatusForMediaType:mediaType];
注意：此方法只对ios7以上的系统有用，如果是在ios6的系统的话就直接崩溃了，况且ios6上也没有“设置--隐私--相机”那一项。
所以加了if(IOS7)的判断。
------------5.2若碰到错误Cannot synthesize weak property in file using manual reference counting项目->TARGETS->Build Settings->Apple LLVM 8.0-Language-Objective C->Weak References in Manual Retian Release改为YES
------------5.3编译报错XXXX.o
若编译运行报错，XXXX.o什么什么的问题，则可能是有依赖框架没有导入。
-----6.参考链接
//原生生成二维码
http://blog.csdn.net/zhuming3834/article/details/50832953
//原生二维码扫描
http://www.cocoachina.com/ios/20161009/17696.html
//zBar下载地址
http://download.csdn.net/download/kid_devil/7552613
//zBarDemo下载地址
http://download.csdn.net/detail/shan1991fei/9474417
//二维码扫描之zXing与zBar的优劣http://blog.csdn.net/l_215851356/article/details/51898514
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