在iOS中使用ZBar扫描二维码和条形码

最新推荐文章于 2024-04-17 06:18:33 发布

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#iOS #二维码 #条形码

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本文详细介绍了如何使用ZBarSDK进行二维码扫描，包括准备工作、扫描步骤及代码实现，并提供了两种不同的实现方式：使用ZBarReaderViewController和ZBarReaderView。通过这些步骤和代码示例，读者可以轻松地在自己的项目中实现二维码扫描功能。

准备工作：

1.下载ZBarSDKhttps://github.com/bmorton/ZBarSDK，加入到项目中

2.导入如下框架

3.导入#import "ZBarSDK.h"

4.继承协议@interface ViewController :UIViewController<ZBarReaderDelegate,ZBarReaderViewDelegate>

扫描步骤：

1.通过摄像头获取图片

2.通过Zbar的内部处理方法来识别图片

3.处理信息并显示

代码实现：

1.创建视图

-(void)creatView{
    //用于响应扫描事件，点击开始扫描
    button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [button setFrame:CGRectMake(110, 200, 100, 40)];
    [button setTitle:@"扫描" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(scanButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    //用于显示扫描到的图像
    imageview = [[UIImageView alloc]initWithFrame:CGRectMake(20, 50, 280, 280)];
    [self.view addSubview:imageview];
    //用于显示扫描到的信息
    label = [[UILabel alloc]initWithFrame:CGRectMake(20, 356, 280, 68)];
    [self.view addSubview:label];
}

2.扫描二维码

方法一：直接调用ZBar提供的ZBarReaderViewController打开一个扫描界面

step1：扫描二维码操作

-(void)scanButtonPressed:(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];
    [self presentViewController:reader animated:YES completion:nil];
}

step2：找到二维码回调的时候会执行ZBarReaderDelegate的对应方法

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info{
    //通过info获得结果
    id<NSFastEnumeration> results =
    [info objectForKey: ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;
    for(symbol in results)
        break;
  <span style="white-space:pre">	</span>
    imageview.image =
    [info objectForKey: UIImagePickerControllerOriginalImage];
    //扫描界面退出
    [reader dismissViewControllerAnimated:YES completion:nil];
}

方法二：使用ZBar提供的可以嵌在其他视图中的ZBarReaderView

step1：扫描二维码操作

-(void)scanButtonPressed:(id)sender{
    ZBarReaderView *readerView = [[ZBarReaderView alloc]init];
    readerView.frame = CGRectMake(10, 44, 300, 300);
    readerView.readerDelegate = self;
    //扫描区域
    CGRect scanMaskRect = CGRectMake(60, CGRectGetMidY(readerView.frame) - 126, 200, 200);
    //处理模拟器
    if (TARGET_IPHONE_SIMULATOR) {
        ZBarCameraSimulator *cameraSimulator
        = [[ZBarCameraSimulator alloc]initWithViewController:self];
        cameraSimulator.readerView = readerView;
    }
    [self.view addSubview:readerView];
    //扫描区域计算
    readerView.scanCrop = [self getScanCrop:scanMaskRect readerViewBounds:readerView.bounds];
    //调用ZBarReaderView的start方法开始扫描
    [readerView start];
}

step2：扫描区域计算

-(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);
}

step3：在扫描到二维码回调的时候会执行ZBarReaderViewDelegate的对应方法

<span style="font-size:18px;">- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
    for (ZBarSymbol *symbol in symbols) {
        NSLog(@"%@", symbol.data);
        //将信息显示在lable上
         label.text =  symbol.data ;
        break;
    }
    //调用ZBarReaderView的stop方法停止扫描
    [readerView stop];
}</span>