IOS开发笔记-TextField点击唤起手机输入法，点击空白处收回输入法

 
 class ViewController: UIViewController,UITextFieldDelegate { 
   override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)
     {
         TextField_namea.resignFirstResponder()
         TextField_nameb.resignFirstResponder()
         TextField_namec.resignFirstResponder()
         TextField_named.resignFirstResponder()
     } 
}