Find UIView by AccessibilityIdentifier

UIView+Util.swift

extension UIView {
    public class func findByAccessibilityIdentifier(identifier: String) -> UIView? {
        
        guard let window = UIApplication.sharedApplication().keyWindow else {
            return nil
        }
        
        func findByID(view: UIView, _ id: String) -> UIView? {
            if view.accessibilityIdentifier == id { return view }
            for v in view.subviews {
                if let a = findByID(v, id) { return a }
            }
            return nil
        }
        
        return findByID(window, identifier)
    }
}