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：