How to Upload an XML using Document Picker and parse it

1. Support opening documents in place = YES

2. Application supports iTunes file sharing = YES

3. Then Created a button to upload the xml file

Code Block 
@IBAction func didTapUploadFile(_ sender: Any) {
	let documentPicker = 	UIDocumentPickerViewController(documentTypes: [kUTTypeItem as String], in: .import)
        documentPicker.delegate = self
        documentPicker.allowsMultipleSelection = false
        present(documentPicker, animated: true, completion: nil)
    }

Code Block 
extension ViewController: UIDocumentPickerDelegate {
	func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) { 
		
	guard let selectedFileUrl = urls.first else { return }
	let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
        let sandboxFile = dir.appendingPathComponent(selectedFileUrl.lastPathComponent)
	
if FileManager.default.fileExists(atPath: sandboxFile.path) {
            print("File Already\(config)")
        } else {
            do {                
                let contentFile = try NSString(contentsOf: selectedFileUrl, encoding: String.Encoding.utf8.rawValue)
                config = contentFile as String
                print("File Upload\(config)")
            } catch {
                print("Error \(error)")
            }
        }	
	}
}