Get size of a UIImage (bytes length) not height and width

Swift 3:

let image = UIImage(named: "example.jpg")
if let data = UIImageJPEGRepresentation(image, 1.0) {
    print("Size: \(data.count) bytes")
}

SWIFT 4+

let imgData = image?.jpegData(compressionQuality: 1.0)
debugPrint("Size of Image: \(imgData!.count) bytes")

you can use this trick to find out image size.

Swift 4 & 5:

extension UIImage {
    var sizeInBytes: Int {
        guard let cgImage = self.cgImage else {
            // This won't work for CIImage-based UIImages
            assertionFailure()
            return 0
        }
        return cgImage.bytesPerRow * cgImage.height
    }
}

I tried to get image size using

let imgData = image.jpegData(compressionQuality: 1.0)

but it gives less than the actual size of image. Then i tried to get size using PNG representation.

let imageData = image.pngData()

but it gives more byte counts than the actual image size.

The only thing that worked perfectly for me.

public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    var asset: PHAsset!
    if #available(iOS 11.0, *) {
      asset = info[UIImagePickerControllerPHAsset] as? PHAsset
    } else {
      if let url = info[UIImagePickerControllerReferenceURL] as? URL {
        asset = PHAsset.fetchAssets(withALAssetURLs: [url], options: .none).firstObject!
      }
    }

    if #available(iOS 13, *) {
      PHImageManager.default().requestImageDataAndOrientation(for: asset, options: .none) { data, string, orien, info in
        let imgData = NSData(data:data!)
        var imageSize: Int = imgData.count
        print("actual size of image in KB: %f ", Double(imageSize) / 1024.0)
      }
    } else {
      PHImageManager.default().requestImageData(for: asset, options: .none) { data, string, orientation, info in
        let imgData = NSData(data:data!)
        var imageSize: Int = imgData.count
        print("actual size of image in KB: %f ", Double(imageSize) / 1024.0)
      }
    }
  }