ZBar的简单使用

Posted 2021-02-15 xfgnongmin

NSRunLoop类声明的编程接口用于管理输入源对象。一个NSRunLoop对象处理像来自窗体系统中的鼠标和键盘事件，NSPORT对象和NSConnection连接对象这类的输入源。一个NSRunLoop对象也处理的NSTimer事件。

你的应用程序不能建立或明白管理NSRunLoop对象。

每一个NSThread对象。包含应用程序的主线程。具有依据须要自己主动创建一个NSRunLoop对象。假设你须要訪问当前线程的执行循环，能够使用类方法currentRunLoop。

1.下载ZBar的第三方库。加入入project

2.加入相关库

? ?AVFoundation.framework

? ?CoreMedia.framework

? ?CoreVideo.framework

? ?libiconv.2.4.0.dylib??

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

4.在控制器中加入例如以下代码

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。这个框只当扫瞄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);
????
????//提供自己定义覆盖层。注意，在showsZBarControls启用的情况下才干够用
????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的每一个轴。当中x轴相应于图像的长轴。默觉得完整的图像（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;

? ???//不过抓住第一个条形码
????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.

//開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，默觉得绿色

@property?(nonatomic,?retain)?UIColor?*trackingColor;

// enable pinch gesture recognition for zooming the preview/decode
// (default YES).

// 能否对预览图进行手势缩放，默认是能够的
@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);

}