iOS - how to sum of multiple text field value in iphone/ios

- (void) buttonClick:(id)sender{
   for (int a=0; a<10; a++) {
       UITextField *textField = (UITextField*)[self.view viewWithTag:a+1];
       NSString *fieldValue = textField.text;
       NSLog(@"Field %d has value: %@", a, fieldValue);
   }
}

for (int i=0; i<count_size; i++) {
      //UITextfield in UIview
    CGRect myTextField = CGRectMake(8, 5, 60, 30);
    UITextField *txtField = [[UITextField alloc] initWithFrame:myTextField];
    txtField.tag = i;
    ...
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
      int index = textField.tag;
      // Now save text using that index
      NSLog(@"Dic: %@",textField.text);
}