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override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    
    for touch:AnyObject in touches {
        let t:UITouch = touch as! UITouch
        //检测当前触摸的view是否是textField
        if t.view == pwdField || t.view == pwdField || t.view == phoneField{
            t.view?.becomeFirstResponder()
        }else{
            phoneField.resignFirstResponder()
            pwdField.resignFirstResponder()
            verificationField.resignFirstResponder()
            self.resignFirstResponder()
        }
    }
    
}

通过响应者链获取对应的第一个符合条件的Responsder

传入响应检测的起点Responsder，一般用于UIView中查找响应者链中的控制器

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func nextResponder(currentView:UIView)->UIViewController{
var vc:UIResponder = currentView
while vc.isKind(of: UIViewController.self) != true {
vc = vc.next!
}
return vc as! UIViewController
}