iOS Loading Overlay View - SWIFT

gistfile1.txt

//
//  LoadingOverlay.swift
//  app
//
//  Created by Igor de Oliveira Sa on 25/03/15.
//  Copyright (c) 2015 Igor de Oliveira Sa. All rights reserved.
//
//  Usage:
// 
//  # Show Overlay
//  LoadingOverlay.shared.showOverlay(self.navigationController?.view)
// 
//  # Hide Overlay
//  LoadingOverlay.shared.hideOverlayView()

import UIKit
import Foundation


public class LoadingOverlay{
    
    var overlayView = UIView()
    var activityIndicator = UIActivityIndicatorView()
    
    class var shared: LoadingOverlay {
        struct Static {
            static let instance: LoadingOverlay = LoadingOverlay()
        }
        return Static.instance
    }
    
    public func showOverlay(view: UIView!) {
        overlayView = UIView(frame: UIScreen.mainScreen().bounds)
        overlayView.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.5)
        activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.WhiteLarge)
        activityIndicator.center = overlayView.center
        overlayView.addSubview(activityIndicator)
        activityIndicator.startAnimating()
        view.addSubview(overlayView)
    }
    
    public func hideOverlayView() {
        activityIndicator.stopAnimating()
        overlayView.removeFromSuperview()
    }
}

This is generating an error for me "unexpectedly found nil . . ." at line 39

I'm getting an error on line#39 as well.
Error: "Unexpectedly found nil while unwrapping an Optional value."

Changing:
"LoadingOverlay.shared.showOverlay(self.navigationController?.view)"
to
"LoadingOverlay.shared.showOverlay(self.view)"

Seems worked for me.

Nice solution. I would suggest making your vars private so they're hidden from invoking objects. Only allow access to your functions. I also added a class level boolean called visible that will track whether the overlay is visible or not. This way a call into stopAnimating and removeFromSuperview only occur if the overlay is visible.

@prwiley and @ctouchstone, you probably do not have a navigation controller initialized. You can get one easily by adding it to the storyboard or you can create a main navigation controller, see http://stackoverflow.com/questions/26753925/set-initial-viewcontroller-in-appdelegate-swift

Exactly what I needed. Thanks for saving me some time 👍

Works great :-) Thanks

Thanks a lot 👍

What about user interactions?

This won't work for view gestures

if there is UIKit, then Foundation is unnecessary to import