使用二维码——第三方库ZBar跟libqrencode的使用

使用二维码——第三方库ZBar和libqrencode的使用

1.下载ZBar SDK并导入工程

地址：https://github.com/bmorton/ZBarSDK

2.往项目中添加Framework框架及动态库

AVFoundation.framework,CoreMedia.framework,CoreVideo.framework,libiconv.dylib和libber.a

3.在使用的地方引入头文件

#import "ZBarSDK.h"

4.使用 ZBarReaderViewController扫描二维码

扫描：

- (void)scan:(id)sender
{
    ZBarReaderViewController *reader = [[ZBarReaderViewController alloc] init];
    reader.readerDelegate = self;
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;
    ZBarImageScanner *scanner = reader.scanner;
    [scanner setSymbology:ZBAR_I25 config:ZBAR_CFG_ENABLE to:0];

    reader.showsZBarControls = YES;

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

}

现在获取二维码的相关信息：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    id<NSFastEnumeration>results = [info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;
    //代码如何修改

    for (symbol in results)
        break;
    //symbol = results;
    imageVIew.image = [info objectForKey:UIImagePickerControllerOriginalImage];

[picker dismissViewControllerAnimated:YES completion:nil];

_label.text = symbol.data;

NSLog(@"扫描内容:%@",symbol.data);

}

5.使用 ZBarReaderView实现扫描页面高度订制

实现协议 ZBarReaderViewDelegate （UIAlertView）

并定义： ZBarReaderView *readerVIew;

ZBarCameraSimulator *cameraSim;

实现代码：

readerVIew = [[ZBarReaderView alloc]init];
    readerVIew.frame = CGRectMake(50, 44, 200, 200);
    readerVIew.readerDelegate = self;
    //关闭闪光灯
    readerVIew.torchMode = 0;
    //扫描区域：很重要
    CGRect scanMaskRect = CGRectMake(60, CGRectGetMidY(readerVIew.frame)-126, 200, 200);

    //[readerVIew setAllowsPinchZoom:YES];

    if (TARGET_IPHONE_SIMULATOR)//应为是否有权限？
    {
        cameraSim = [[ZBarCameraSimulator alloc]initWithViewController:self];
        cameraSim.readerView = readerVIew;
    }
    [self.view addSubview:readerVIew];
    //扫描区域计算:加上该代码后似乎无法扫描出结果了
    readerVIew.scanCrop = [self getScanCrop:scanMaskRect readerViewBounds:readerVIew.bounds];
    [readerVIew start];

区域范围：

-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds
{
    CGFloat x,y,width,height;

    x = rect.origin.x / readerViewBounds.size.width;
    y = rect.origin.y / readerViewBounds.size.height;
    width = rect.size.width / readerViewBounds.size.width;
    height = rect.size.height / readerViewBounds.size.height;

    return CGRectMake(x, y, width, height);

}

ZBarReaderViewDelegate的方法：

- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
    NSString *codeData = [[NSString alloc]init];
    for (ZBarSymbol *sym in symbols)
    {
        codeData = sym.data;
        break;
    }
    //可以获取到
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:codeData delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
    alert.delegate = self;
    [alert show];
    [readerVIew stop];

}

打开获取到的信息：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

[[UIApplication sharedApplication]openURL:[NSURL URLWithString:alertView.message]];

}

6.使用libqrencode生成二维码

步骤一：首先向工程中导入第三方库libqrencode

步骤二：向QRCodeGenerator.h或者整个项目中引入框架 #import <UIKit/UIKit.h>，否则会报错

步骤三：在相应的文件中引入头文件

#import "QRCodeGenerator.h"

步骤四：调用库中的方法生成图片（参数为字符串和图片大小）

UIImage *image = [QRCodeGenerator qrImageForString:_label.text imageSize:imageVIew.bounds.size.width];

其他应用待进一步挖掘。

使用二维码——第三方库ZBar跟libqrencode的使用

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