Swift - Get file size from url

Question

i am using documentPicker to get url path of any document and then uploaded to the database. I am choosing file (pdf, txt ..) , the upload is working but i want to limit the size of the file .

 public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {

        self.file = url //url
        self.path = String(describing: self.file!) // url to string
        self.upload = true //set upload to true
        self.attachBtn.setImage(UIImage(named: "attachFilled"), for: .normal)//set image
        self.attachBtn.tintColor = UIColor.black //set color tint
        sendbtn.tintColor = UIColor.white //


        do
        {
            let fileDictionary = try FileManager.default.attributesOfItem(atPath: self.path!)
            let fileSize = fileDictionary[FileAttributeKey.size]
            print ("\(fileSize)")
        } 
        catch{
            print("Error: \(error)")
        }

    }

I get the error message , this file does not exist , where does the document picker save the file and how to get his attributes.

Answer 1

First of all, in the file system you get the path of a URL with the path property.

self.path = url.path

But you don't need that at all. You can retrieve the file size from the URL directly:

self.path = String(describing: self.file!) // url to string

do {
    let resources = try url.resourceValues(forKeys:[.fileSizeKey])
    let fileSize = resources.fileSize!
    print ("\(fileSize)")
} catch {
    print("Error: \(error)")
}