How do you change the UIControl with focus on iPhone?

Question

I am trying to do something I thought would be simple.

I have a form with two UITextFields on it. I am using the UIReturnKeyNext style on the first. The idea is that when the user fills in the first field, they click Next and I transition them to the next UITextField. I've seen other apps that do this and it works really well. But I cannot figure out how to set the focus to the next field.

Answer 1

Simple. send a becomeFirstResponder message to your other textfield. When the other textfield accepts first responder status, it will receive the information from the keyboard.

For Example:

//called when the next button is pressed
//Assume textField1, 2, and 3 are instances of UITextField
-(IBAction) nextPressed: (id) sender {
      if ([textField1 isFirstResponder]) {
         [textField2 becomeFirstResponder];
      }
      if ([textField2 isFirstResponder]) {
         [textField3 becomeFirstResponder];
      }

}

Answer 2

The Answer above works great with the exception that you would want to resignFirstResponder from the original text field.

If you do not resign first responder, the IOS automatic scroll adjustment wont work when the next field becomes the first responder. (The keyboard might be covering the next text field.)

-(IBAction) nextPressed: (id) sender {

    //Resign first so that when the next field becomes firstResponder 
    //the text field will scroll into place if covered by the keyboard
    [sender resignFirstResponder];      

    if ([textField1 isFirstResponder]) {
       [textField2 becomeFirstResponder];
    }
    if ([textField2 isFirstResponder]) {
       [textField3 becomeFirstResponder];
    }
}