Get file size of PHAsset without loading in the resource?

Question

Is there a way to get the file size on disk of a PHAsset without doing requestImageDataForAsset or converting it to ALAsset? I am loading in previews of a user's photo library - potentially many thousands of them - and it's imperative to my app that they know the size before import.

score 25 · Accepted Answer · answered Jul 14 '17 at 19:58

25

You can grab the fileSize of a PHAsset and convert it to human readable form like this:

      let resources = PHAssetResource.assetResources(for: yourAsset) // your PHAsset

      var sizeOnDisk: Int64? = 0

      if let resource = resources.first {
        let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong
        sizeOnDisk = Int64(bitPattern: UInt64(unsignedInt64!))
      }

Then use your sizeOnDisk variable and pass it into a method like this...

func converByteToHumanReadable(_ bytes:Int64) -> String {
     let formatter:ByteCountFormatter = ByteCountFormatter()
     formatter.countStyle = .binary

     return formatter.string(fromByteCount: Int64(bytes))
 }

answered Jul 14 '17 at 19:58

Ryan Daulton

849
10
21

This is really an awesome solution! But didn't find this in any document. Will Apple approve this?!? – Erfan Sep 14 '17 at 20:45
4

It's not in any documentation because it's accessing the header files. Technically this is a small piece of Apple's private APIs. However, we have submitted a build and received full approval without issue. – Ryan Daulton Sep 14 '17 at 22:24
@daulSwift How can we do this in Objective - C ? – Omkar Jadhav Nov 01 '17 at 15:49
will this private key filesize crash in iOS versions? – Chandra Lakkimsetty Feb 02 '18 at 05:49
@ChandraLakkimsetty not that I know of, that's what we used it for – Ryan Daulton Feb 02 '18 at 18:46
1

Is it safety to take only first item? As apple said: " An asset can contain multiple resources - for example, an edited photo asset contains resources for both the original and edited images". – Gringo Russo Nov 21 '19 at 14:18
We'll probably need to check the `resources` for the image resources: `kUTTypeJPEG, AVFileType.heic.rawValue, kUTTypePNG, kUTTypeTIFF, kUTTypeRawImage` – SoftDesigner Jul 07 '20 at 09:02
UPD. But I noticed that the `resources.last` is always the most recent resource (iOS 13). – SoftDesigner Jul 07 '20 at 09:55

Anna K. · Answer 2 · 2020-08-29T01:07:18.033

2

Please try this.

let resources = PHAssetResource.assetResources(for: YourAsset)
var sizeOnDisk: Int64 = 0

if let resource = resources.first {
   let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong
   sizeOnDisk = Int64(bitPattern: UInt64(unsignedInt64!))

   totalSize.text = String(format: "%.2f", Double(sizeOnDisk) / (1024.0*1024.0))+" MB"
}

edited Aug 29 '20 at 01:07

answered Aug 29 '20 at 01:01

Anna K.

41
4

qiz · Answer 3 · 2018-10-12T02:14:36.097

A safer solution:

[asset requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {
    NSNumber *fileSize = nil;
    NSError *error = nil;
    [contentEditingInput.fullSizeImageURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:&error];
    NSLog(@"file size: %@\nerror: %@", fileSize, error);
}];

Swift version:

asset.requestContentEditingInput(with: nil) { (contentEditingInput, _) in
    do {
        let fileSize = try contentEditingInput?.fullSizeImageURL?.resourceValues(forKeys: [URLResourceKey.fileSizeKey]).fileSize
        print("file size: \(String(describing: fileSize))")
    } catch let error {
        fatalError("error: \(error)")
    }
}

Inspired by How to get an ALAsset URL from a PHAsset?

This method is so heavy. Won't work for the thousands of assets. — SoftDesigner, Jul 07 '20 at 09:00
Yes, so it is better to execute in a background thread and cache the result. — qiz, Jul 15 '20 at 07:17

Get file size of PHAsset without loading in the resource?

3 Answers3