iOS8 Photos Framework：如何获取PHAsset的名称（或文件名）？

Question

我试图使用PHAssets获取图片名称。但我无法找到文件名元数据或获取图像名称的任何方法。有没有不同的方法来获取文件名？

Answer 1

我知道问题已经得到解答，但我想我会提供另一种选择：

extension PHAsset {

    var originalFilename: String? {

        var fname:String?

        if #available(iOS 9.0, *) {
            let resources = PHAssetResource.assetResources(for: self)
            if let resource = resources.first {
                fname = resource.originalFilename
            }
        }

        if fname == nil {
            // this is an undocumented workaround that works as of iOS 9.1
            fname = self.value(forKey: "filename") as? String
        }

        return fname
    }
}

Answer 2

如果您想获取图像名称（例如照片中最后一张照片的名称），例如IMG_XXX.JPG，您可以试试这个：

PHAsset *asset = nil;
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];
if (fetchResult != nil && fetchResult.count > 0) {
    // get last photo from Photos
    asset = [fetchResult lastObject];
}

if (asset) {
    // get photo info from this asset
    PHImageRequestOptions * imageRequestOptions = [[PHImageRequestOptions alloc] init];
    imageRequestOptions.synchronous = YES;
    [[PHImageManager defaultManager]
             requestImageDataForAsset:asset
                            options:imageRequestOptions
                      resultHandler:^(NSData *imageData, NSString *dataUTI,
                                      UIImageOrientation orientation, 
                                      NSDictionary *info) 
     {
          NSLog(@"info = %@", info);
          if ([info objectForKey:@"PHImageFileURLKey"]) {
               // path looks like this - 
               // file:///var/mobile/Media/DCIM/###APPLE/IMG_####.JPG
               NSURL *path = [info objectForKey:@"PHImageFileURLKey"];
     }                                            
    }];
}

希望它有所帮助。

在Swift中代码看起来像这样

PHImageManager.defaultManager().requestImageDataForAsset(asset, options: PHImageRequestOptions(), resultHandler:
{
    (imagedata, dataUTI, orientation, info) in
    if info!.keys.contains(NSString(string: "PHImageFileURLKey"))
    {
        let path = info![NSString(string: "PHImageFileURLKey")] as! NSURL
    }
})

Swift 4 ：

    let fetchResult = PHAsset.fetchAssets(with: .image, options: nil)
    if fetchResult.count > 0 {
        if let asset = fetchResult.firstObject {
            let date = asset.creationDate ?? Date()
            print("Creation date: \(date)")
            PHImageManager.default().requestImageData(for: asset, options: PHImageRequestOptions(),
                resultHandler: { (imagedata, dataUTI, orientation, info) in
                    if let info = info {
                        if info.keys.contains(NSString(string: "PHImageFileURLKey")) {
                            if let path = info[NSString(string: "PHImageFileURLKey")] as? NSURL {
                                print(path)
                            }
                        }
                    }
            })
        }
    }

Answer 3

还有一个选择：

[asset valueForKey:@"filename"]

这取决于你的“合法性”。

Answer 4

Swift 4中最简单的iOS 9+解决方案（基于skims的答案）：

extension PHAsset {
    var originalFilename: String? {
        return PHAssetResource.assetResources(for: self).first?.originalFilename
    }
}

Answer 5

当你有资产参考网址时，最简单的回答：

if let asset = PHAsset.fetchAssetsWithALAssetURLs([referenceUrl], options: nil).firstObject as? PHAsset {

    PHImageManager.defaultManager().requestImageDataForAsset(asset, options: nil, resultHandler: { _, _, _, info in

        if let fileName = (info?["PHImageFileURLKey"] as? NSURL)?.lastPathComponent {      
            //do sth with file name
        }
    })
}

Answer 6

您真正需要的是 localIdentifier ，它是一个唯一的字符串，可以持久识别该对象。

使用此字符串通过使用：

查找对象

fetchAssetsWithLocalIdentifiers:options:, fetchAssetCollectionsWithLocalIdentifiers:options:, or fetchCollectionListsWithLocalIdentifiers:options: method.

有更多信息，请here

Answer 7

<强> SWIFT4： 第一个import Photos

if let asset = PHAsset.fetchAssets(withALAssetURLs: [info[UIImagePickerControllerReferenceURL] as! URL],
                                           options: nil).firstObject {


            PHImageManager.default().requestImageData(for: asset, options: nil, resultHandler: { _, _, _, info in

                if let fileName = (info?["PHImageFileURLKey"] as? NSURL)?.lastPathComponent {
                    print("///////" + fileName + "////////")
                    //do sth with file name
                }
            })
        }