UIViewAdditions.swift

//
//  UIViewAdditions.swift
//
//  Created by Daniel Tartaglia on 04/15/15.
//  Copyright © 2016. MIT License.
//

import UIKit


extension UIView {

    func findDeepChildSatisfying(criteria: (_ view: UIView) -> Bool) -> UIView? {
        var queue: [UIView] = []
        queue.append(self)
        while !queue.isEmpty {
            let view = queue[0]
            queue = Array(queue.dropFirst())
            if criteria(view) {
                return view
            }
            else {
                for subview in view.subviews {
                    queue.append(subview)
                }
            }
        }
        return nil
    }
}