iOS中使用ZBar扫描二维码自定义扫描界面

之前在Android中使用过ZXing识别二维码，ZXing也有对应的iOS版本，经过了解，ZBar也是一个常用的二维码识别软件，并分别提供了iOS和Android的SDK可供使用，最终我选择了ZBar进行二维码识别，它的注释清晰，便于使用。

ZBar为我们提供了两种使用方式，一种是直接调用ZBar提供的ZBarReaderViewController打开一个扫描界面，另一种方式是使用ZBar提供的可以嵌在其他视图中的ZBarReaderView，实际项目中我们更可能会使用第二种方式，这可以让我们对界面做更多的定制。

ZBar使用起来也非常简单，将ZBarSDK导入项目，在需要使用ZBar的文件中导入ZBarSDK.h头文件即可

#pragma mark 初始化扫描
- (void)InitScan
{
    readview = [ZBarReaderView new];
    readview.backgroundColor = [UIColor clearColor];
    readview.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    readview.readerDelegate = self;
    readview.allowsPinchZoom = YES;//使用手势变焦
    readview.trackingColor = [UIColor redColor];
    readview.showsFPS = NO;// 显示帧率  YES 显示  NO 不显示
    //readview.scanCrop = CGRectMake(0, 0, 1, 1);//将被扫描的图像的区域

    UIImage *hbImage=[UIImage imageNamed:@"pick_bg.png"];
    scanZomeBack=[[UIImageView alloc] initWithImage:hbImage];
    //添加一个背景图片
    CGRect mImagerect=CGRectMake((readview.frame.size.width-200)/2.0, (readview.frame.size.height-200)/2.0, 200, 200);
    [scanZomeBack setFrame:mImagerect];
    readview.scanCrop = [self getScanCrop:mImagerect readerViewBounds:readview.bounds];//将被扫描的图像的区域

    [readview addSubview:scanZomeBack];
    [readview addSubview:readLineView];
    [self.view addSubview:readview];
    [readview start];

}

#pragma mark 获取扫描区域
-(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);
}

#pragma mark 扫描动画
-(void)loopDrawLine
{
    CGRect  rect = CGRectMake(scanZomeBack.frame.origin.x, scanZomeBack.frame.origin.y, scanZomeBack.frame.size.width, 2);
    if (readLineView) {
        [readLineView removeFromSuperview];
    }
    readLineView = [[UIImageView alloc] initWithFrame:rect];
    [readLineView setImage:[UIImage imageNamed:@"line.png"]];
    [UIView animateWithDuration:3.0
                          delay: 0.0
                        options: UIViewAnimationOptionCurveEaseIn
                     animations:^{
                         //修改fream的代码写在这里
                         readLineView.frame =CGRectMake(scanZomeBack.frame.origin.x, scanZomeBack.frame.origin.y+scanZomeBack.frame.size.height, scanZomeBack.frame.size.width, 2);
                         [readLineView setAnimationRepeatCount:0];

                     }
                     completion:^(BOOL finished){
                         if (!is_Anmotion) {

                             [self loopDrawLine];
                         }

                     }];

    [readview addSubview:readLineView];

}
#pragma mark 获取扫描结果
- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
    // 得到扫描的条码内容
    const zbar_symbol_t *symbol = zbar_symbol_set_first_symbol(symbols.zbarSymbolSet);
    NSString *symbolStr = [NSString stringWithUTF8String: zbar_symbol_get_data(symbol)];
    if (zbar_symbol_get_type(symbol) == ZBAR_QRCODE) {
        // 是否QR二维码
    }

    for (ZBarSymbol *symbol in symbols) {
        [sTxtField setText:symbol.data];
        break;
    }

    [readerView stop];
    [readerView removeFromSuperview];

}