iOS开发笔记--自定义Zbar扫描界面

这个简单的实例实在 ZBarReaderViewController 的 view 层上再加一层用于定义自己的界面

 - (void)QRscan

 {

     ZBarReaderViewController *reader = [ZBarReaderViewController new];

     reader.readerDelegate = self;

 //非全屏

     reader.wantsFullScreenLayout = NO;

     //隐藏底部控制按钮

     reader.showsZBarControls = NO;

 //设置自己定义的界面

     [self setOverlayPickerView:reader];

     ZBarImageScanner *scanner = reader.scanner;

    [scanner setSymbology: ZBAR_I25

                    config: ZBAR_CFG_ENABLE

                        to: 0];

     [self presentModalViewController: reader

                             animated: YES];

     [reader release];

 }

 - (void)setOverlayPickerView:(ZBarReaderViewController *)reader

 {

 //清除原有控件

     for (UIView *temp in [reader.view subviews]) {

         for (UIButton *button in [temp subviews]) {

             if ([button isKindOfClass:[UIButton class]]) {

                 [button removeFromSuperview];

             }

         }

         for (UIToolbar *toolbar in [temp subviews]) {

             if ([toolbar isKindOfClass:[UIToolbar class]]) {

                 [toolbar setHidden:YES];

                 [toolbar removeFromSuperview];

             }

         }

     }

     //画中间的基准线

     UIView* line = [[UIView alloc] initWithFrame:CGRectMake(40, 220, 240, 1)];

     line.backgroundColor = [UIColor redColor];

     [reader.view addSubview:line];

     [line release];

 //最上部view

     UIView* upView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 80)];

     upView.alpha = 0.3;

     upView.backgroundColor = [UIColor blackColor];

     [reader.view addSubview:upView];

     //用于说明的label

     UILabel * labIntroudction= [[UILabel alloc] init];

     labIntroudction.backgroundColor = [UIColor clearColor];

     labIntroudction.frame=CGRectMake(15, 20, 290, 50);

     labIntroudction.numberOfLines=2;

     labIntroudction.textColor=[UIColor whiteColor];

     labIntroudction.text=@"将二维码图像置于矩形方框内，离手机摄像头10CM左右，系统会自动识别。";

     [upView addSubview:labIntroudction];

     [labIntroudction release];

     [upView release];

 //左侧的view

     UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 80, 20, 280)];

     leftView.alpha = 0.3;

     leftView.backgroundColor = [UIColor blackColor];

     [reader.view addSubview:leftView];

     [leftView release];

 //右侧的view

     UIView *rightView = [[UIView alloc] initWithFrame:CGRectMake(300, 80, 20, 280)];

     rightView.alpha = 0.3;

     rightView.backgroundColor = [UIColor blackColor];

     [reader.view addSubview:rightView];

     [rightView release];

     //底部view

     UIView * downView = [[UIView alloc] initWithFrame:CGRectMake(0, 360, 320, 120)];

     downView.alpha = 0.3;

     downView.backgroundColor = [UIColor blackColor];

     [reader.view addSubview:downView];

     [downView release];

     //用于取消操作的button

     UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

     cancelButton.alpha = 0.4;

     [cancelButton setFrame:CGRectMake(20, 390, 280, 40)];

     [cancelButton setTitle:@"取消" forState:UIControlStateNormal];

     [cancelButton.titleLabel setFont:[UIFont boldSystemFontOfSize:20]];

     [cancelButton addTarget:self action:@selector(dismissOverlayView:)forControlEvents:UIControlEventTouchUpInside];

     [reader.view addSubview:cancelButton];

 }

 //取消button方法

 - (void)dismissOverlayView:(id)sender{

     [self dismissModalViewControllerAnimated: YES];

 }

reader.scancrop 设置；

Try this. If CGRect = CGRectMake(x, y, width, height);, then do:

float A = y / readerView.bounds.size.height; float B = 1 - (x + width) / readerView.bounds.size.width; float C = (y + height) / readerView.bounds.size.height; float D = 1 - x / readerView.bounds.size.width;; CGRectMake( A, B, C, D );