使用ZBarSDK生成和读取二维码

1.下载ZBarSDK，下载地址：http://zbar.sourceforge.net/iphone/index.html

2.新建项目，导入ZBarSDK，并添加下列framework

CoreMedia.framework

CoreVideo.framework

AVFoundation.framework

QuartzCore.framework

libiconv.dylib

libzbar.a

3.扫瞄二维码(全屏)

（1）在viewController界面导入头文件 #import"ZBarSDK.h"

   (2)  点击扫瞄按钮的时候触发下面的时间

- (IBAction)scanBtn:(id)sender
{
    ZBarReaderViewController *reader = [ZBarReaderViewControllernew];
    reader.readerDelegate =self;
    reader.supportedOrientationsMask =ZBarOrientationMaskAll;
    
   ZBarImageScanner *scanner = reader.scanner;
    
    [scanner setSymbology:ZBAR_I25
                  config:ZBAR_CFG_ENABLE
                      to:0];
    [selfpresentViewController:readeranimated:YEScompletion:nil];
}

找到二维码的时候会执行下面这个方法：

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info
{
    id results =
    [info objectForKey:ZBarReaderControllerResults];
   ZBarSymbol *symbol =nil;
   for(symbolin results)
       break;
    
   resultLabel.text =  symbol.data;
    
   imgView.image =
    [info objectForKey:UIImagePickerControllerOriginalImage];
    
    [reader dismissViewControllerAnimated:YEScompletion:nil];
}

可以看到resultlabel上面显示的信息就是扫瞄的二维码信息。

4.生成二维码

导入头文件#import"QRCodeGenerator.h"

- (IBAction)creatBtn:(id)seder
{
    imgView.image = [QRCodeGeneratorqrImageForString:_textField.textimageSize:imgView.bounds.size.width];
}

5.控制扫瞄区域

    

ZBarReaderView *readerView = [[ZBarReaderViewalloc]init];
    readerView.frame =CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);
    readerView.readerDelegate =self;
    //关闭闪光灯
    readerView.torchMode =0;
    //扫描区域
   CGRect scanMaskRect = CGRectMake(60, 140, 260, 260);
    
    //处理模拟器
    if (TARGET_IPHONE_SIMULATOR) {
       ZBarCameraSimulator *cameraSimulator
        = [[ZBarCameraSimulatoralloc]initWithViewController:self];
        cameraSimulator.readerView = readerView;
    }
    [self.viewaddSubview:readerView];
    [self.viewsendSubviewToBack:readerView];
    //扫描区域计算
    readerView.scanCrop = [selfgetScanCrop:scanMaskRectreaderViewBounds:readerView.bounds];
    
    [readerViewstart];

以上代码需要说明的有以下几点：
闪光灯设置
我不希望在扫描二维码时开启闪光灯，所以将ZBarReaderView的torchMode设为0，你可以将它设置为其他任何合适的值。
扫描区域计算
这点比较重要，我们常用的二维码扫描软件的有效扫描区域一般都是中央区域，其他部分是不进行扫描的，ZBar可以通过ZBarReaderView的scanCrop属性设置扫描区域，它的默认值是CGRect(0, 0, 1, 1),表示整个ZBarReaderView区域都是有效的扫描区域。我们需要把扫描区域坐标计算为对应的百度分数坐标，也就是以上代码中调用的getScanCrop:readerViewBounds方法

-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds
{
   CGFloat x,y,width,height;
    
    x = rect.origin.x / readerViewBounds.size.width;
    y = rect.origin.y / readerViewBounds.size.height;
    width = rect.size.width / readerViewBounds.size.width;
    height = rect.size.height / readerViewBounds.size.height;
    
   return CGRectMake(x, y, width, height);
}

实现委托

- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet*)symbols fromImage:(UIImage *)image
{
   for (ZBarSymbol *symbolin symbols) {
       NSLog(@"%@", symbol.data);
       break;
    }
    [readerView stop];
    [selfdismissViewControllerAnimated:YEScompletion:nil];
}

iOS 7以上可以使用苹果自带的框架，详情见http://blog.csdn.net/cafei111/article/details/12994415