使用ZBar来读取条形码和二维码的方法

1.使用ZBar项目。下载地址是： http://zbar.sourceforge.net/iphone/index.html

2.新建一个项目。

3.导入 ZBar的sdk。把ZBar SDK的目录拉入项目，然后选中copy选项

4.在项目文件的target中加入 以下framework

5.在appDelegate文件中加入 标记部分的代码

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
     self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
     // Override point for customization after application launch.
     self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
     self.window.rootViewController = self.viewController;
     [self.window makeKeyAndVisible];


     // force view class to load so it may be referenced directly from NIB
     [ZBarReaderView class];


     return YES;
 }

注意此代码：

 // force view class to load so it may be referenced directly from NIB
  [ZBarReaderView class];

6.在.h文件中加入   ZBarReaderViewDelegate的实现，代码如下:

 //
 //  ViewController.h
 //  FootSafety
 //
 //  Created by 泽宇 徐 on 12-6-12.
 //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
 //

 #import <UIKit/UIKit.h>
 #import "ZBarSDK.h"

 @interface ViewController : UIViewController<ZBarReaderViewDelegate>
 {
     IBOutlet UILabel  * label ;
     ZBarReaderView *readerView;
     ZBarCameraSimulator *cameraSim;
 }

 @property(nonatomic,retain) UILabel * label ;
 @property (nonatomic, retain) IBOutlet ZBarReaderView *readerView;


 @end

7.在.m文件中要实现的主要方法是：

 - (void) readerView: (ZBarReaderView*) view
      didReadSymbols: (ZBarSymbolSet*) syms
           fromImage: (UIImage*) img
 {
     // do something useful with results
     for(ZBarSymbol *sym in syms) {
         self.label.text = sym.data;
         break;
     }
 }

这里是功能是读取照片信息，把条码放如label显示

 -(void) viewDidAppear:(BOOL)animated
 {
     // run the reader when the view is visible
     [readerView start];
 }

这个是在显示视图的时候，启动摄像头，开始扫描

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

     // the delegate receives decode results
     readerView.readerDelegate = self;

     // you can use this to support the simulator
     if(TARGET_IPHONE_SIMULATOR) {
         cameraSim = [[ZBarCameraSimulator alloc]
                      initWithViewController: self];
         cameraSim.readerView = readerView;
     }

 }

在初始化的时候，设置托管。

.m文件所有内容是：

 //
 //  ViewController.m
 //  FootSafety
 //
 //  Created by 泽宇 徐 on 12-6-12.
 //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController
 @synthesize label;
 @synthesize readerView;

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

     // the delegate receives decode results
     readerView.readerDelegate = self;

     // you can use this to support the simulator
     if(TARGET_IPHONE_SIMULATOR) {
         cameraSim = [[ZBarCameraSimulator alloc]
                      initWithViewController: self];
         cameraSim.readerView = readerView;
     }

 }

 -(void) viewDidAppear:(BOOL)animated
 {
     // run the reader when the view is visible
     [readerView start];
 }


 - (void) readerView: (ZBarReaderView*) view
      didReadSymbols: (ZBarSymbolSet*) syms
           fromImage: (UIImage*) img
 {
     // do something useful with results
     for(ZBarSymbol *sym in syms) {
         self.label.text = sym.data;
         break;
     }
 }



 - (void)viewDidUnload
 {
     [super viewDidUnload];
     // Release any retained subviews of the main view.
 }

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 {
     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
 }

 -(void) dealloc
 {
     [self.readerView release];
     [self.label release];
     [super dealloc];
 }

 @end

在ViewController.xib文件中 增加一个view，并且修改view的类是ZBarReaderView ，并且指向 .h文件中定义的 

 ZBarReaderView *readerView;