cocos2dx-lua在ios上实现生成及扫描二维码

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
#import
#import "ZBarReaderController.h"
#import
#define IOS7 [[[UIDevice currentDevice] systemVersion]floatValue]>=7


@interface ZCZBarViewController : UIViewController
{
    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
@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{

//[email protected]  [email protected]
    UIImage*image= [UIImage imageNamed:@"[email protected]"];
    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
//        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:@"[email protected]"] 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