iOS开发——高级技术&二维码功能的实现

二维码功能的实现

ZBarSDK，一个比较优秀的开源项目，使用起来也很简单。

ZBarSDK是一个开源的SDK，可从这里下载到源码，该SDK实现了识别和读取各种条形码，包括EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Interleaved 2 of 5 和 QR Code。

帮助文档：http://zbar.sourceforge.net/iphone/sdkdoc/index.html

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：

ViewController.h

 #import <uikit uikit.h="">
 #import "ZBarSDK.h"

 @interface ViewController : UIViewController <zbarreaderdelegate> @property (weak, nonatomic) IBOutlet UIImageView *imageView;
 - (IBAction)scan:(id)sender;
 @property (weak, nonatomic) IBOutlet UILabel *label;

 @end</zbarreaderdelegate></uikit>

ViewController.m

 #import "ViewController.h"
 #import "ZBarSDK.h"

 @interface ViewController ()

 @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)scan:(id)sender {

     ZBarReaderViewController * reader = [ZBarReaderViewController new];
     reader.readerDelegate = self;
     ZBarImageScanner * scanner = reader.scanner;
     [scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:];

     reader.showsZBarControls = YES;

     [self presentViewController:reader animated:YES completion:nil];

 }

 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
 {
     id<nsfastenumeration> results = [info objectForKey:ZBarReaderControllerResults];
     ZBarSymbol * symbol;
     for(symbol in results)
         break;

     _imageView.image = [info objectForKey:UIImagePickerControllerOriginalImage];

     [picker dismissViewControllerAnimated:YES completion:nil];

     _label.text = symbol.data;
 }

 @end</nsfastenumeration>

在界面上放置一个UIImageView/UILabel/UIButton, UIImageView 用于显示扫描到的图像，UILabel用于显示扫描到的信息，UIButton 用于响应事件。

布局如图：