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iOS + Swift: Display activity indicator overlay - UIViewController extension
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| // | |
| // UIViewController+ActivityIndicator.swift | |
| // | |
| // Created by Eduard Moya on 5/11/18. | |
| // Copyright © 2018 Eduard Moya. All rights reserved. | |
| // | |
| import UIKit | |
| fileprivate let overlayViewTag = 999 | |
| fileprivate let activityIndicatorTag = 1000 | |
| extension UIViewController { | |
| public func displayActivityIndicator(shouldDisplay: Bool) -> Void { | |
| if shouldDisplay { | |
| setActivityIndicator() | |
| } else { | |
| removeActivityIndicator() | |
| } | |
| } | |
| private func setActivityIndicator() -> Void { | |
| guard !isDisplayingActivityIndicatorOverlay() else { return } | |
| guard let parentViewForOverlay = navigationController?.view ?? view else { return } | |
| //configure overlay | |
| let overlay = UIView() | |
| overlay.translatesAutoresizingMaskIntoConstraints = false | |
| overlay.backgroundColor = UIColor.black | |
| overlay.alpha = 0.5 | |
| overlay.tag = overlayViewTag | |
| //configure activity indicator | |
| let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge) | |
| activityIndicator.translatesAutoresizingMaskIntoConstraints = false | |
| activityIndicator.tag = activityIndicatorTag | |
| //add subviews | |
| overlay.addSubview(activityIndicator) | |
| parentViewForOverlay.addSubview(overlay) | |
| //add overlay constraints | |
| overlay.heightAnchor.constraint(equalTo: parentViewForOverlay.heightAnchor).isActive = true | |
| overlay.widthAnchor.constraint(equalTo: parentViewForOverlay.widthAnchor).isActive = true | |
| //add indicator constraints | |
| activityIndicator.centerXAnchor.constraint(equalTo: overlay.centerXAnchor).isActive = true | |
| activityIndicator.centerYAnchor.constraint(equalTo: overlay.centerYAnchor).isActive = true | |
| //animate indicator | |
| activityIndicator.startAnimating() | |
| } | |
| private func removeActivityIndicator() -> Void { | |
| let activityIndicator = getActivityIndicator() | |
| if let overlayView = getOverlayView() { | |
| UIView.animate(withDuration: 0.2, animations: { | |
| overlayView.alpha = 0.0 | |
| activityIndicator?.stopAnimating() | |
| }) { (finished) in | |
| activityIndicator?.removeFromSuperview() | |
| overlayView.removeFromSuperview() | |
| } | |
| } | |
| } | |
| private func isDisplayingActivityIndicatorOverlay() -> Bool { | |
| if let _ = getActivityIndicator(), let _ = getOverlayView() { | |
| return true | |
| } | |
| return false | |
| } | |
| private func getActivityIndicator() -> UIActivityIndicatorView? { | |
| return (navigationController?.view.viewWithTag(activityIndicatorTag) ?? view.viewWithTag(activityIndicatorTag)) as? UIActivityIndicatorView | |
| } | |
| private func getOverlayView() -> UIView? { | |
| return navigationController?.view.viewWithTag(overlayViewTag) ?? view.viewWithTag(overlayViewTag) | |
| } | |
| } |
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