Extension for a UIView to find the first superview matching a certain class (or nil)

UIView+FindSuperviewWithClass.swift

import UIKit

extension UIView {
    func findSuperviewWithClass<T>(superViewClass : T.Type) -> UIView? {
        var xsuperView : UIView!  = self.superview!
        var foundSuperView : UIView!
        
        while (xsuperView != nil && foundSuperView == nil) {
            if xsuperView.self is T {
                foundSuperView = xsuperView
            } else {
                xsuperView = xsuperView.superview
            }
        }
        
        return foundSuperView
    }
}