Esconder teclado cuando se pulsa Enter y ejecutar algo

gistfile1.m

- (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if([string isEqualToString:@"\n"]) {
        [textField resignFirstResponder];
        return NO;
    }
    
    return YES;
}


- (BOOL) textFieldShouldEndEditing:(UITextField *)textField
{
    return YES;
}


- (void) textFieldDidEndEditing:(UITextField *)textField
{
    NSString *address = textField.text;
    if([self.delegate respondsToSelector:@selector(DO_SOMETHING_WITH_TEXT:)])
    {
        [self.delegate DO_SOMETHING_WITH_TEXT:address];
    }
}