- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(done:)];
    tapGestureRecognizer.numberOfTapsRequired = 1;
    [self.view addGestureRecognizer: tapGestureRecognizer];   //只需要点击非文字输入区域就会响应hideKeyBoard
    [tapGestureRecognizer release];
    return YES;
}

-(void)done:(id)sender
{
    for (UIView *view in self.view.subviews) {
        if ([view isKindOfClass:[UITextField class]]) {
            [view resignFirstResponder];
        }
    }
}