How to get file size of PHAsset?

Question

Suppose there is a PHAsset representing image. How to get file size of the image?

The only way I see is using valueForKey: with private ALAssetURL key, and retrieving size of ALAssetRepresentation , but apple can reject such app.

Answer 1

Swift 4/5 solution

Extension

extension PHAsset {
    var fileSize: Float {
        get {
            let resource = PHAssetResource.assetResources(for: self)
            let imageSizeByte = resource.first?.value(forKey: "fileSize") as! Float
            let imageSizeMB = imageSizeByte / (1024.0*1024.0)
            return imageSizeMB
        }
    }
}

Function

func getImageFileSize(from asset: PHAsset) -> Float{
    let resource = PHAssetResource.assetResources(for: asset)
    let imageSizeByte = resource.first?.value(forKey: "fileSize") as! Float
    let imageSizeMB = imageSizeByte / (1024.0*1024.0)
    return imageSizeMB
}

Answer 2

You can create an ALAsset from a PHAsset without using any private functions as described here: How to get an ALAsset URL from a PHAsset?

However getting file sizes is problematic in the context of iCloud Photo Library. For photos not on the device you might get a value of "0" or the size of the version on the device, which is not the original in very case.