How to call an id sender function from another function?

Question

In the following code example, I want to be able to call backgroundTap from another function btnSubmitLoginPassword. What parameter should I pass?

-(IBAction) backgroundTap:(id)sender{

    [userName resignFirstResponder];
    [password resignFirstResponder];

}

-(IBAction) btnSubmitLoginPassword{

    [self backGroundTap:?????????]


    [self validate];


}

Answer 1

PengOne的答案很好，但你问题的确切答案是：传递参数传递nil ：

[self backgroundTap:nil];

Answer 2

You aren't using sender in the action, so why not just leave it out?

-(IBAction) backgroundTap{
    [userName resignFirstResponder];
    [password resignFirstResponder];
}

-(IBAction) btnSubmitLoginPassword{
    [self backGroundTap];
    [self validate];
}

Answer 3

you are not using id value in the method

    -(IBAction) backgroundTap:(id)sender
   {

     [userName resignFirstResponder];
     [password resignFirstResponder];

    }

instead use like

  -(IBAction) backgroundTap
   {

     [userName resignFirstResponder];
     [password resignFirstResponder];

    }

and then make it call as

  -(IBAction) btnSubmitLoginPassword{

  [self backGroundTap];

   [self validate];
   }

if you want to change/access sender property alone then you should use (id)sender

Answer 4

Usually the sender parameter is UIView or any other object that generates the event. In this case it would be consequent to use self as a sender.