2

当我在 IOS8 的标准照片应用程序中使用过滤器时，我无法获得完整的元数据。我尝试了两种获取元数据的方法：

[manager requestImageDataForAsset:asset options:options resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
    CIImage *ciimage = [CIImage imageWithData:imageData];
    NSMutableDictionary *exif = [NSMutableDictionary dictionary];
    [exif addEntriesFromDictionary:ciimage.properties];
}];

[asset requestContentEditingInputWithOptions:editOptions completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
    CIImage *cimage = [CIImage imageWithContentsOfURL:contentEditingInput.fullSizeImageURL];
    NSMutableDictionary *exif = [NSMutableDictionary dictionary];
    [exif addEntriesFromDictionary:cimage.properties];
}];

我没有发现任何提及应用程序照片。我得到这样的结果总是：

{
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 1;
PixelHeight = 2592;
PixelWidth = 1936;
"{Exif}" =     {
    ColorSpace = 1;
    PixelXDimension = 1936;
    PixelYDimension = 2592;
};
"{JFIF}" =     {
    DensityUnit = 1;
    JFIFVersion =         (
        1,
        0,
        1
    );
    XDensity = 72;
    YDensity = 72;
};
"{TIFF}" =     {
    Orientation = 1;
};

有没有人找到解决方案如何获取已在照片中编辑的图像的元数据？

我想看到这样的元数据：

关联

4

4 回答 4

2

我发现如何获取原始元数据：

PHImageRequestOptions *options = [PHImageRequestOptions new];
options.networkAccessAllowed = YES;
options.synchronous = YES;
options.version = PHImageRequestOptionsVersionOriginal;

[manager requestImageDataForAsset:asset options:options resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
    CIImage *ciimage = [CIImage imageWithData:imageData];
    NSMutableDictionary *exif = [NSMutableDictionary dictionary];
    [exif addEntriesFromDictionary:ciimage.properties];
}];
于 2014-09-30T01:27:48.737 回答
0

您可以从 PHAsset 的属性中获取创建日期、修改日期。PHA 资产属性

于 2014-09-29T13:59:27.673 回答
0

我已经尝试了完全相同的代码以及所有其他替代机制来从 XCode IOS 8 模拟器中的照片应用程序中检索原始图像数据，并且对于我在模拟器下的照片应用程序中的任何图像返回的唯一内容是几乎空的 EXIF - 与原始问题中说明的内容几乎相同。

问题是：这是否仅与模拟器隔离？通过拖放将图像添加到模拟器中的照片应用程序是否存在问题？

PHImageManager.defaultManager().requestImageForAsset(assetImage as PHAsset, targetSize:PHImageManagerMaximumSize, contentMode: .AspectFill, options: nil, resultHandler: { (initialResult, _) in
        self.photoImageView.image = initialResult as UIImage
        println("WTF")
        println(initialResult)
    })

和这个

PHImageManager.defaultManager().requestImageDataForAsset(assetImage, options: imageRequestOptions, resultHandler: { (imageData: NSData!, dataUti: String!, orientation: UIImageOrientation, _) in
        println("requestImageDataForAsset")
        println(imageData)
        let imageTest = CIImage(data: imageData)
        println(imageTest)
        let imageMeta = imageTest.properties()
        println(imageMeta)
    })

和这个

        assetImage.requestContentEditingInputWithOptions(initialRequestOptions, completionHandler: { (input: PHContentEditingInput!, _)  -> Void in
        //Get full image
        let url = input.fullSizeImageURL
        let orientation = input.fullSizeImageOrientation
        var inputImage = CIImage(contentsOfURL: url)
        inputImage = inputImage.imageByApplyingOrientation(orientation)

        for (key, value) in inputImage.properties() {
            println("key: \(key)")
            println("value: \(value)")
        }
    })

所有在 8.0/8.1 的 XCode IOS 模拟器中产生相同的结果。

您的代码适用于模拟器吗？它似乎与我提供的第二个样本相同，但事实并非如此。

于 2014-10-27T23:35:59.247 回答
0

太奇怪了。

NSString *albumName = @"albumName"
PHFetchOptions *fetchOption = [[PHFetchOptions alloc]init];
fetchOption.predicate = [NSPredicate predicateWithFormat:@"title == %@",albumName];

PHFetchResult *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:fetchOption];

PHFetchOptions *fetchOption = [[PHFetchOptions alloc]init];
fetchOption.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
fetchOption.predicate = [NSPredicate predicateWithFormat:@"mediaType == 1"];
fetchOption.wantsIncrementalChangeDetails = YES;
PHFetchResult *result = [PHAsset fetchAssetsInAssetCollection:[result firstObject] options:nil];

//MetaData here is not complicated as you get
[result[0] requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
    CIImage *image = [CIImage imageWithContentsOfURL:contentEditingInput.fullSizeImageURL];
    NSDictionary *metaData = [[NSDictionary alloc]initWithDictionary:image.properties];
    NSLog(@"metadata: %@", image.properties.description);
}];

使用上面的代码，元数据并不复杂。接着..

NSString *type = [NSString stringWithFormat:@"mediaType == 1 && (pixelWidth != %f && pixelHeight != %f)",SCREEN_WIDTH*scale,SCREEN_HEIGHT*scale];

allPhotosfetchOption.predicate = [NSPredicate predicateWithFormat:type];
PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:allPhotosfetchOption];

[result[0] requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
    CIImage *image = [CIImage imageWithContentsOfURL:contentEditingInput.fullSizeImageURL];
    NSDictionary *metaData = [[NSDictionary alloc]initWithDictionary:image.properties];
    NSLog(@"metadata: %@", image.properties.description);
}];

在这里我可以获得完整的元数据......我认为这是 Photos.framework 的一个错误

于 2015-05-27T10:58:54.463 回答