iOS--二维码（libqrencode、ZBarSDK）

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二维码就是保存一些字符串的信息。

第三方库下载地址：http://download.csdn.net/detail/u010165653/8294135

创建二维码图片：

使用第三方库，libqrencode，

01：导入第三方库，这个库不需要额外的系统类库。

02 ：导入头文件 #import"QRCodeGenerator.h"

03：使用方法：

UIImageView* imageView = [[UIImageView alloc] initWithFrame:CGRectMake(50,50,220, 220)];

[self.view addSubview:imageView];

[imageView release];

imageView.image = [QRCodeGenerator qrImageForString:@"要转成二维码的文本" imageSize:imageView.bounds.size.width];

示例：

#import <UIKit/UIKit.h>
#import "QRCodeGenerator.h"@interface ViewController : UIViewController@end<span style="color:#b4261a;">
</span>

#import "ViewController.h"@implementation ViewController- (void)viewDidLoad
{[super viewDidLoad];UIImageView* imageView = [[UIImageView alloc] initWithFrame:CGRectMake(50, 50, 220, 220)];[self.view addSubview:imageView];[imageView release];imageView.image = [QRCodeGenerator qrImageForString:@"要转成二维码的文本" imageSize:imageView.bounds.size.width];
}@end

扫描二维码图片：

使用第三方库， ZBarSDK

01：导入第三方库，这个库依赖系统类库，所以还需要导入系统类库有：

AVFoundation.framework

CoreMedia.framework

CoreVideo.framework

QuartzCore.framework

libiconv.dylib

02：导入头文件： #import "ZBarSDK.h"

03：创建ZBarReaderController对象，设置代理,遵从

UINavigationControllerDelegate，UIImagePickerControllerDelegate

示例代码：

#import <UIKit/UIKit.h>
#import "ZBarSDK.h"
/*导入ZBarSDK文件并引入一下框架AVFoundation.frameworkCoreMedia.frameworkCoreVideo.frameworkQuartzCore.frameworklibiconv.dylib引入头文件#import “ZBarSDK.h” 即可使用*/@interface ViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>@end

#import "ViewController.h"@implementation ViewController- (void)viewDidLoad
{[super viewDidLoad];UIButton* button = [UIButton buttonWithType:UIButtonTypeRoundedRect];button.frame = CGRectMake(50, 10, 100, 40);[self.view addSubview:button];[button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];}- (void)buttonClick{ZBarReaderController* zbarController = [[ZBarReaderController alloc] init];zbarController.delegate = self;[self presentModalViewController:zbarController animated:YES];
}- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];ZBarSymbol *symbol = nil;for(symbol in results)break;//最后得到的结果NSLog(@"%@",symbol.data);[picker dismissModalViewControllerAnimated:YES];
}- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{[picker dismissModalViewControllerAnimated:YES];
}@end

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