ipad中zbar的使用＋为zbar添加阴影+扫描线

最新推荐文章于 2025-08-02 16:06:56 发布

weixin_30802273

最新推荐文章于 2025-08-02 16:06:56 发布

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原文链接：http://www.cnblogs.com/binglin92/p/3598753.html

本文介绍如何在ZBar库中实现自定义扫描视图，包括调整扫描界面大小、增加扫描提示元素及设置扫描区域阴影等操作，适用于iOS平台。




//因图片pick_bg.png是设计成iphone使用的， 我这里偷点小懒，只将imageview放大成两倍，以供ipad使用，如果iphone上想使用，将下列宏定义为1.0f即可

#define kRatia 2.0f

- (IBAction)scanningButtonClicked:(id)sender {
    ZBarReaderViewController * reader = [ZBarReaderViewController new];
    

    UIImageView *imageview = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pick_bg.png"]];
    CGSize center = [UIScreen mainScreen].bounds.size;
    CGRect imageviewRect = imageview.frame;
    imageviewRect.size.width = imageviewRect.size.width * kRatia;
    imageviewRect.size.height = imageviewRect.size.height * kRatia;
    [imageview setFrame:imageviewRect];
    [imageview setCenter:CGPointMake(center.width/2, center.height/2)];
    [reader.view addSubview:imageview];
    
    reader.readerDelegate = self;
    //如果想要快速读取到维码信息，质量高的，更能快速识别
//    [reader setVideoQuality:UIImagePickerControllerQualityTypeHigh];
    
    reader.scanCrop = [self getScanCrop:imageview.frame readerViewBounds:[UIScreen mainScreen].bounds];
//扫描的感应框
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;
    ZBarImageScanner *scanner = reader.scanner;
    
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    
    UIImageView *line = [[UIImageView alloc] initWithFrame:CGRectMake(30, 10, 220*kRatia, 2*kRatia)];
    line.image = [UIImage imageNamed:@"line.png"];
    [imageview addSubview:line];
    //定时器
    lineTimer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(animation1:) userInfo:line repeats:YES];
    //为框添加阴影
    [self addShadow:reader withImageWith:imageview.frame.size.width];
    
    [self presentViewController:reader animated:NO completion:^{
    }];
}

/**
 *  绿色线条扫瞄动画
 *
 *  @param timer 传递image－》by userInfo
 */
-(void)animation1:(NSTimer *)timer
{
    UIImageView *lineImage = timer.userInfo;
    UIImageView *frameImage = (UIImageView*)lineImage.superview;
    
    CGRect frameRect = frameImage.frame;
    CGRect lineRect = lineImage.frame;
    CGFloat y = lineRect.origin.y;
    lineRect.origin.y = fmodf((y + 1.0f * kRatia),frameRect.size.height-3.0f);//+frameImage.frame.origin.y;
    [lineImage setFrame:lineRect];
}

/**
 *  设置扫瞄区域
 *
 *  @param rect             需要扫瞄区域
 *  @param readerViewBounds 整个屏幕区域
 *
 *  @return 单位化的frame//因确切的rect 会导致扫瞄不出来，所以需要将rect扩大一点，能够增强灵敏度
 */
-(CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds
{
    CGFloat x,y,width,height;
    
    x = (rect.origin.x-100) / readerViewBounds.size.width;
    y = (rect.origin.y) / readerViewBounds.size.height;
    width = (rect.size.width+200) / readerViewBounds.size.width;
    height = (rect.size.height+100) / readerViewBounds.size.height;
    
    CGRect croprect = CGRectMake(x, y, width, height);
    return croprect;
}


/**
 *  添加扫描区域阴影部分
 *  @param imageWidth 图片宽度
 */
-(void)addShadow:(ZBarReaderViewController *)reader withImageWith:(CGFloat)imageWidth
{
    //最上部view
    
    CGSize frameSize = [UIScreen mainScreen].bounds.size;
    float imageHalfWidth = imageWidth / 2.0f;
    //顶端view的frame
    CGRect upviewFrame = CGRectMake(0, 0, frameSize.width, frameSize.height/2 - imageHalfWidth);
    
    float upY = upviewFrame.size.height;
    float upWidth = frameSize.width/2 - imageHalfWidth;
    float upHeight = frameSize.height-2 * upY;
    //左侧的view
    CGRect leftViewFrame = CGRectMake(0, upY ,upWidth , upHeight);
    //右侧的view
    CGRect rightViewRect = CGRectMake(frameSize.width/2 + imageHalfWidth, upY, upWidth, upHeight);
    //底部view
    CGRect bottomViewRect = CGRectMake(0, upY + upHeight, frameSize.width ,upY );
    [self addViewWithFrame:bottomViewRect inZBarController:reader];
    [self addViewWithFrame:rightViewRect  inZBarController:reader];
    [self addViewWithFrame:leftViewFrame  inZBarController:reader];
    [self addViewWithFrame:upviewFrame    inZBarController:reader];
}

-(void)addViewWithFrame:(CGRect)frame inZBarController:(ZBarReaderViewController *)reader
{
    UIView * greyView = [[UIView alloc] initWithFrame:frame];
    greyView.alpha = 0.3;
    greyView.backgroundColor = [UIColor blackColor];
    [reader.view addSubview:greyView];
}

　　想在zbar库中找到能够设置阴影的方法，目前没有成功，不知zbar里有无集成方式可以设置阴影，如知道，请告诉我一声，谢谢！

附上所使用的小框和绿色小条在code4app的一个demo中

转载于:https://www.cnblogs.com/binglin92/p/3598753.html