Question

我在http://zbar.sourceforge.net/download.html下载ZBarSDK 1.2 当我将ZBarReaderViewController的sourceType设置为UIImagePickerControllerSourceTypeCamera时，它运行良好。但是当我将sourceType设置为UIImagePickerControllerSourceTypePhotoLibrary或UIImagePickerControllerSourceTypeSavedPhotosAlbum时，应用程序崩溃了，我得到了如下错误：

2012-05-28 17：23：03.476哇[4137：10703] *断言失败 - [ZBarReaderViewController setSourceType：]，/ Users / spadix / zbar / hg / sdk /iphone / ZBarReaderViewController.m：650 2012-05-28 17：23：03.626哇[4137：10703] * 终止应用程序未被捕获的异常＆＃39; NSInternalInconsistencyException＆＃39;，原因：＆＃39;尝试为sourceType属性＆＃39;
设置不受支持的值（1）

我已经谷歌这个问题但无法找到解决方案。任何人都可以告诉我如何解决这个问题？剂量版本1.2只支持UIImagePickerControllerSourceTypeCamera？我下载的源代码是不是很糟糕？

感谢。

Answer 1

如果要选择已保存的图像，基本上会显示标准的iOS媒体视图控制器。用户从标准iOS媒体控制器中选择图像后，您实例化ZBarImageScanner的副本以扫描图像。如果这有意义，请跳到步骤5以查看我如何使用ZBarImageScanner扫描UIImage。否则，请尝试按照以下步骤操作。希望这会有所帮助。

首先向用户显示带选项的提醒。

UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"" delegate:self  
                                          cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera", @"Camera   Roll", @"Photo Library", nil];
[sheet showInView:self.view];

选择时，

- (void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex {
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    switch (buttonIndex) {
        case 0: sourceType = UIImagePickerControllerSourceTypeCamera; break;
        case 1: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; break;
        case 2: sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break;
        default: break;
    }
    if ( buttonIndex <= 2 ) {
        [self presentBarcodeReader:sourceType];
    }
}

当且仅当sourceType == UIImagePickerControllerSourceTypeCamera使用ZBar呈现图像捕获界面时。

- (void)presentBarcodeReader:(UIImagePickerControllerSourceType)sourceType {
    if ( sourceType == UIImagePickerControllerSourceTypeCamera ) {
        ZBarReaderViewController *reader = [ZBarReaderViewController new];
        reader.readerDelegate = self;
        reader.showsZBarControls = YES;
        reader.supportedOrientationsMask = ZBarOrientationMaskAll;

        ZBarImageScanner *scanner = reader.scanner;
        [scanner setSymbology: ZBAR_I25
                       config: ZBAR_CFG_ENABLE
                           to: 0];
        [self presentModalViewController:reader animated:YES];
    } else {
        UIImagePickerController *mediaUI = [[UIImagePickerController alloc] init];
        mediaUI.sourceType = sourceType;
        mediaUI.mediaTypes = [UIImagePickerController         availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
        mediaUI.allowsEditing = NO;
        mediaUI.delegate = self;
        [self presentModalViewController:mediaUI animated:YES];
    }
}

我们可以通过两种方式检测使用了哪种媒体选择器

- (void)imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo:(NSDictionary*)info {
    id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
    if ( results ) {
        ZBarSymbol *symbol = nil;
        for (symbol in results) break;

        [reader dismissViewControllerAnimated:YES completion:^{
            [self partLookup:symbol.data];
        }];
    } else {
        UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage] ?         [info objectForKey:UIImagePickerControllerEditedImage] : [info         objectForKey:UIImagePickerControllerOriginalImage];
        [self scanImage:image];
    }
}

和多汁的部分

- (void)scanImage:(UIImage*)image {
    ZBarImage *zImage = [[ZBarImage alloc] initWithCGImage:image.CGImage];
    ZBarImageScanner *scanner = [[ZBarImageScanner alloc] init];
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    [scanner scanImage:zImage];
    ZBarSymbolSet *set = [scanner results];

    for (ZBarSymbol *symbol in set) {
        NSLog(@"%@", symbol.data);
        // process symbol.data however you please.
    }
}

我不能在ZBarSDK中使用sourceType作为UIImagePickerControllerSourceTypePhotoLibrary

1 个答案: