[Sharable] a protocol to handle sharing via UIActivityViewController #swift #protocol

Sharable.swift

import UIKit

protocol Sharable {
    func share(_ str: String, source: UIView?, completionHandler: ((_ completed: Bool) -> Void)?)
}

extension Sharable where Self: UIViewController {
    func share(_ str: String, source: UIView? = nil, completionHandler: ((_ completed: Bool) -> Void)? = nil) {
        let activityController = UIActivityViewController.init(activityItems: [str], applicationActivities: nil)
        activityController.popoverPresentationController?.sourceView = source ?? self.view
        activityController.completionWithItemsHandler = {(activityType: UIActivityType?, completed: Bool, returnedItems: [Any]?, error: Error?) in
            completionHandler?(completed)
        }

        self.present(activityController, animated: true, completion: nil)
    }
}