在iOS中使用ZBar扫描二维码和条形码

最近做了个外包项目，里面用到了二维码扫描和微信支付！之前比较熟悉的是ZXing,但是在Xcode7.1里面发现竟然莫名的不支持，木有办法，从网上查了一下还有一种支持二维码扫描的东西，没错就是接下来我要说的东东，二维码扫描的利器 ZBarSDK。闲言少絮叨，言归正传！

1、下载 ZBarSDK 官网 https://github.com/bmorton/ZBarSDK

2、导入如下框架

3、在AppDelegetem文件中#import "ZBarSDK.h"

并且 在

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

里面添加下面的代码

//二维码读取

[ZBarReaderViewclass];

4、在二维码扫描界面开始#import "ZBarSDK.h" ，添加

<ZBarReaderDelegate,ZBarReaderViewDelegate>委托

下面开始介绍扫描步骤：
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

- (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];
}

另外有一点需要注意的地方，二维码扫描所在页面和其他页面间的跳转尽量用

SaoMiaoVC *saomiao = [[[SaoMiaoVC alloc]init]autorelease];

saomiao.hidesBottomBarWhenPushed=YES;

saomiao.delegate=self;

UINavigationController *nav= [[[UINavigationController alloc] initWithRootViewController:saomiao] autorelease];

[self presentViewController:nav animated:YES completion:nil]; 这种方式，因为用push 的话容易因为退出或者销毁得不及时而产生各种各样的问题！