iOS之二维码的制作与扫描

二维码SDK的Dome“QRCode”中制作libqrencode库文件，扫描ZBarSDK库文件
1.制作二维码  /*字符转二维码
导入 libqrencode文件
添加  #import "QRCodeGenerator.h"
@property (strong , nonatomic) UIImageView* qRImageView;
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.qRImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
     [self.view addSubview:self.qRImageView];
}

-(IBAction)qrBtnPress:(id)sender
{
    self.qRImageView.image = [QRCodeGenerator qrImageForString:@"二维码存储的字符串信息 asddsdd" imageSize:self.qRImageView.bounds.size.width];
}
2.读取二维码信息

添加#import "ZBarSDK.h"//读二维码库

@interface ViewController : UIViewController//读二维码的代
@property (strong , nonatomic) ZBarReaderViewController* reader;
@property (strong , nonatomic) NSString* qRUrl;

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    self.qRUrl = [[NSString alloc] init];
    self.reader = [[ZBarReaderViewController alloc] init];
    self.reader.readerDelegate = self;
    self.reader.supportedOrientationsMask = ZBarOrientationMaskAll;
   
    ZBarImageScanner *scanner = self.reader.scanner;
   
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    //这部分为zBarSDK文档提供的例子给出的主要的意思就是初始化ZBarReaderViewController类的对象，以及设置代理回调方法为    - (void) imagePickerController: (UIImagePickerController*) reader
   //didFinishPickingMediaWithInfo: (NSDictionary*) info
 
    self.qRImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 400)];
   
    [self.view addSubview:self.qRImageView];
}


//点击Button时将扫描二维码需要的照相机视图，  self.reader是（ZBarReaderViewController）类的对象
-(IBAction)QRPress:(id)sender
{
    [self presentViewController:self.reader animated:YES completion:^{
        NSLog(@"fd");
    }];
}
//这个回调方法的写法是固定，只要知道以下几点就好需要的数据是从symbol.data中取出的，因此也就需要在.h文件中声明一个字符串接受就好。在这里我在.h中声明了self.qRUrl对象进行接受，之后只要按下面的格式写就好。

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info
{
   
        id results =
        [info objectForKey: ZBarReaderControllerResults];
        ZBarSymbol *symbol = nil;
        for(symbol in results)
        {
            NSLog(@"symbol =%@",symbol.data);
            break;
        }
    self.qRUrl  = symbol.data;
    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:self.qRUrl message:self.qRUrl delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
        self.qRImageView.image =
        [info objectForKey: UIImagePickerControllerOriginalImage];
       
    [self.reader dismissViewControllerAnimated:YES completion:^{
       
    }];

}