ZBar简单使用

1.下载ZBar的第三方库，添加入工程

http://zbar.sourceforge.net/iphone/index.html
https://github.com/bmorton/ZBarSDK
2.添加相关库
AVFoundation.framework
CoreMedia.framework
CoreVideo.framework
libiconv.2.4.0.dylib

3.增加一个以ZBarReaderViewController为父类的控制器，并实现ZBarReaderDelegate代理

4.在控制器中添加如下代码

条形码的扫描
- (void)viewDidLoad

{

[super viewDidLoad];

//设置代理

self.readerDelegate = self;

//扫瞄图像

ZBarImageScanner *mScanner = self.scanner;

//是否显示绿色的追踪框，注意，即当选择yes的时候，这个框仅仅当扫瞄EAN和I2/5的时候才可见。

self.tracksSymbols = YES;

//是否使用备用控制组

self.showsZBarControls = YES;

//支持的方向，用ZBarOrientationMask() 和 ZBarOrientationMaskAll

self.supportedOrientationsMask = ZBarOrientationMask(UIInterfaceOrientationMaskPortrait);

//提供自定义覆盖层。注意，在showsZBarControls启用的情况下才可以用

UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];

view.backgroundColor = [UIColor grayColor];

self.cameraOverlayView = view;

//裁剪扫描的图像，在扫描前图像将被裁剪到这个矩形内，这个矩形框是将图像的尺寸和宽高比标准化，

//有效值将放置矩形内介于0和1的每个轴，其中x轴对应于图像的长轴。默认为完整的图像（0，0，1，1）。

// self.scanCrop

//调节以适应预览图片

// self.cameraViewTransform

//解码配置

[mScanner setSymbology:ZBAR_I25

config:ZBAR_CFG_ENABLE

to:0];

// Do any additional setup after loading the view.

}

- (void)viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

[self.readerView start];

}

- (void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

[self.readerView stop];

}

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info

{

//获取扫瞄结果

id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];

ZBarSymbol *symbol = nil;

//仅仅是抓住第一个条形码

for (symbol in results)

break;

NSString *text = symbol.data;

//解决中文乱码问题

if ([text canBeConvertedToEncoding:NSShiftJISStringEncoding])
{

text = [NSString stringWithCString:[text cStringUsingEncoding:NSShiftJISStringEncoding] encoding:NSUTF8StringEncoding];

}

NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%@",text],@"resultLabel",[info objectForKey:UIImagePickerControllerOriginalImage],@"resultImgView", nil];

[self performSelectorOnMainThread:@selector(mainAction:) withObject:dic waitUntilDone:NO];

}

- (void)mainAction:(NSDictionary *)dic

{

OtherViewController *other = [[OtherViewController alloc] init];

other.resultString = [dic objectForKey:@"resultLabel"];

other.image = [dic objectForKey:@"resultImgView"];

[self.navigationController pushViewController:other animated:YES];

}

此时，我们再来看看ZBarReaderViewController中的ZBarReaderView这个类
// supply a pre-configured image scanner.
//支持一个预先准备的图片扫描

- (id) initWithImageScanner: (ZBarImageScanner*)
imageScanner;

// start the video stream and barcode reader.
//开始视频流和条形码扫描

- (void) start;

// stop the video stream and barcode reader.
//停止视频流和条形码扫描

- (void) stop;

// clear the internal result cache
//清理内部的缓存

- (void) flushCache;

// compensate for device/camera/interface orientation
// 适应设备的方向

- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation)
orient

duration: (NSTimeInterval) duration;

// delegate is notified of decode results.
//代理

@property (nonatomic, assign) id<ZBarReaderViewDelegate>
readerDelegate;

// access to image scanner for configuration.
//直接对图片扫描配置

@property (nonatomic, readonly) ZBarImageScanner *scanner;

// whether to display the tracking annotation for uncertain barcodes

// (default YES).
// 是否为不确定的条形码显示追踪

@property (nonatomic) BOOL tracksSymbols;

// color of the tracking box (default green)
//追踪框的颜色，默认为绿色

@property (nonatomic, retain) UIColor *trackingColor;

// enable pinch gesture recognition for zooming the preview/decode

// (default YES).

// 是否能对预览图进行手势缩放，默认是可以的

@property (nonatomic) BOOL allowsPinchZoom;

// torch mode to set automatically (default Auto).

// 0为不闪光，1为闪光

@property (nonatomic) NSInteger torchMode;

// zoom scale factor applied to video preview *and* scanCrop.

// also updated by pinch-zoom gesture. clipped to range [1,maxZoom],

// defaults to 1.25
// 施加于摄像前景画面和扫描区域的缩放

@property (nonatomic) CGFloat zoom;

- (void) setZoom: (CGFloat) zoom

animated: (BOOL) animated;

// the region of the image that will be scanned. normalized coordinates.
// 图片将被扫描的区域，标准坐标

@property (nonatomic) CGRect scanCrop;

二维码的扫描

实现代理ZBarReaderViewDelegate

- (void)readerView:(ZBarReaderView *)readerView
didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image

{

ZBarSymbol *symbol = nil;

for (symbol in symbols)

break;

NSString *text = symbol.data;

NSLog(@"%@",text);

}