如何查找從iOS Image Picker獲取的JPEG的實際大小？

Question

由於壓縮值未知，因此使用UIImageJPEGRepresentation轉換數據並查找字節數不起作用。有沒有其他方法可以做到這一點？

Answer 1

let assetPath = info[UIImagePickerControllerReferenceURL] as! NSURL 

let asset = PHAsset.fetchAssets(withALAssetURLs: [assetPath as URL], options: nil).lastObject 

PHImageManager().requestImageData(for: asset!, options: nil) { (data, value, orientation, info) in 
// data?.count will give total bytes 
print(data?.count) 
}