Navigate through textfields using Next/Done buttons.

In Objective-C

-(BOOL)textFieldShouldReturn:(UITextField*)textField   {
    NSInteger nextTag = textField.tag + 1;
    UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
    if (nextResponder) {
    [nextResponder becomeFirstResponder];
    } else {
  
    [textField resignFirstResponder];
    }
    return NO; 

 }

In Swift

func textFieldShouldReturn(textField: UITextField!) -> Bool {   
        
        let nextTage=textField.tag+1;
        let nextResponder=textField.superview?.viewWithTag(nextTage) as UIResponder!
        
        if (nextResponder != nil){
            nextResponder?.becomeFirstResponder()
        }
        else
        {
            textField.resignFirstResponder()
        }
        return false
    }
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        textField .resignFirstResponder()
   }