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;