获取当前View的控制器

extension UIView {
    /**
     *  获取当前View的控制器
     */
    func parentViewController() -> UIViewController? {
        
        var next:UIResponder?
        next = self.next
        while next != nil {
            //2.判断响应者对象是否是视图控制器类型
            if ((next as? UIViewController) != nil) {
                return (next as! UIViewController)
                
            }else {
                next = next?.next
            }
        }
        return UIViewController()
    }
}