Loading an “overlay” when running long tasks in iOS

Question

What is example for loading overlay in Swift IOS application when do a long tasks. Example for loading data from remote server. I googled but not found any answer.

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Answer 1

@Ajinkya Patil answer as a reference. Swift 4.0 and newer

This is an Extension Solution to use on all viewController without clashing.

Create a LoadingDialog+ViewContoller.swift

import UIKit

struct ProgressDialog {
    static var alert = UIAlertController()
    static var progressView = UIProgressView()
    static var progressPoint : Float = 0{
        didSet{
            if(progressPoint == 1){
                ProgressDialog.alert.dismiss(animated: true, completion: nil)
            }
        }
    }
}
extension UIViewController{
   func LoadingStart(){
        ProgressDialog.alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)
    
    let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50))
    loadingIndicator.hidesWhenStopped = true
    loadingIndicator.style = UIActivityIndicatorView.Style.gray
    loadingIndicator.startAnimating();

    ProgressDialog.alert.view.addSubview(loadingIndicator)
    present(ProgressDialog.alert, animated: true, completion: nil)
  }

  func LoadingStop(){
    ProgressDialog.alert.dismiss(animated: true, completion: nil)
  }
}

call the function inside ViewController anywhere you like. like so:

self.LoadingStart()

and here's how to stop the loading dialog.

self.LoadingStop()