ios中二维码的用法

　　网上的例子  zbar 下载地址 http://pan.baidu.com/share/link?shareid=2652605686&uk=923776187
1.新建一个工程A:view-base
.拖动zbar框架到工程目录下
.然后把zbar/iphone目录下的工程.xproj文件拖到A
.在工程的Link Binary添加框架如下:

Step1.使用ZBarSDK 需要导入的framework

1.AVFoundation.framework

2.CoreMedia.framework

3.CoreVideo.framework

4.QuartzCore.framework

5.libiconv.dylib

Step2.在ViewController.h 导入#import "ZBarSDK.h"

Step3.在ViewController.h 继承 <ZBarReaderDelegate>协议

Step4.写代码：

-(IBAction) startScan
{
    ZBarReaderController *reader = [[[ZBarReaderController alloc] init] autorelease];
    reader.delegate = self;
    reader.cameraMode = ZBarReaderControllerCameraModeSampling;  

    ZBarImageScanner *scanner = reader.scanner;
    [scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to:];  

    [self presentModalViewController: reader animated:YES];  

}
- (void) imagePickerController: (UIImagePickerController*) picker didFinishPickingMediaWithInfo: (NSDictionary*) info
{
    UIImage *image = [info objectForKey: UIImagePickerControllerOriginalImage];  

    id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;  

    for(symbol in results)
    {
        break;
    }  

    if(!symbol || !image)
    {
        return;
    }  

    NSLog(@"symbol.data = %@", symbol.data);  

//最关键的移行代码
    self.resultLabel.text = symbol.data;  

    [picker dismissModalViewControllerAnimated: YES];
}
.给.h添加<UINavigationControllerDelegate,UIImagePickerControllerDelegate>
辅助:
zbarTest02是自己研究的源代码.

自己写的demo  记得一定要添加“ZBarSDK文件下的 libzbar.a”

#import <UIKit/UIKit.h>

#import "ZBarSDK.h"
@interface ViewController : UIViewController<ZBarReaderDelegate>
- (IBAction)click:(id)sender;

@end

#import "ViewController.h"

@interface ViewController ()
@property(nonatomic,retain)ZBarReaderViewController *reader;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)click:(id)sender {

  self.reader=[[[ZBarReaderViewController alloc] init] autorelease];
    self.reader.readerDelegate=self;
    ZBarImageScanner *scanner=self.reader.scanner;
    [scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:];
    [self presentViewController:self.reader animated:YES completion:nil];
;

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    id<NSFastEnumeration> result=[info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol=nil;
    for (symbol in result) {
        break;
        [self.reader dismissViewControllerAnimated:YES completion:nil];
    }
}
@end