Custom Activity Indicator

//

//  ViewController.swift

//  MyFirstApp

//

//  Created by Divakar on 19/10/17.

//  Copyright © 2017 Divakar. All rights reserved.

//

import UIKit

class ViewController: UIViewController {

    

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        

        customActivityIndicatory(self.view, startAnimate: true)

        

        //hide activityIndicatorView

     //   customActivityIndicatory(self.view, startAnimate: false)

    }

    

    

    @discardableResult

    func customActivityIndicatory(_ viewContainer: UIView, startAnimate:Bool? = true) -> UIActivityIndicatorView {

        let mainContainer: UIView = UIView(frame: viewContainer.frame)

        mainContainer.center = viewContainer.center

        mainContainer.backgroundColor = hexStringToUIColor(hex: "#FFFFFF")

        mainContainer.alpha = 0.5

        mainContainer.tag = 789456123

        mainContainer.isUserInteractionEnabled = false

        

        let viewBackgroundLoading: UIView = UIView(frame: CGRect(x:0,y: 0,width: 80,height: 80))

        viewBackgroundLoading.center = viewContainer.center

        viewBackgroundLoading.backgroundColor = hexStringToUIColor(hex: "#444444")

        viewBackgroundLoading.alpha = 0.5

        viewBackgroundLoading.clipsToBounds = true

        viewBackgroundLoading.layer.cornerRadius = 15

        

        let activityIndicatorView: UIActivityIndicatorView = UIActivityIndicatorView()

        activityIndicatorView.frame = CGRect(x:0.0,y: 0.0,width: 40.0, height: 40.0)

        activityIndicatorView.activityIndicatorViewStyle =

            UIActivityIndicatorViewStyle.whiteLarge

        activityIndicatorView.center = CGPoint(x: viewBackgroundLoading.frame.size.width / 2, y: viewBackgroundLoading.frame.size.height / 2)

        if startAnimate!{

            viewBackgroundLoading.addSubview(activityIndicatorView)

            mainContainer.addSubview(viewBackgroundLoading)

            viewContainer.addSubview(mainContainer)

            activityIndicatorView.startAnimating()

        }else{

            for subview in viewContainer.subviews{

                if subview.tag == 789456123{

                    subview.removeFromSuperview()

                }

            }

        }

        return activityIndicatorView

    }

        func hexStringToUIColor (hex:String) -> UIColor {

            var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

    

            if (cString.hasPrefix("#")) {

                cString.remove(at: cString.startIndex)

            }

    

            if ((cString.characters.count) != 6) {

                return UIColor.gray

            }

    

            var rgbValue:UInt32 = 0

            Scanner(string: cString).scanHexInt32(&rgbValue)

    

            return UIColor(

                red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,

                green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,

                blue: CGFloat(rgbValue & 0x0000FF) / 255.0,

                alpha: CGFloat(1.0)

            )

        }

}