問題描述：

       檢視view上有一個UIButton例項btn，綁定了一個點選事件的響應方法buttonClicked：，由於某種需要（如點選空白區域收起鍵盤），為view添加了UITapGestureRecognizer手勢，關鍵程式碼如下：

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(resignRespond)];
    [self.view addGestureRecognizer:tap];
    [tap release];
 

解決方法：

       設定UITapGestureRecognizer的代理，然後在協議方法中作判斷，主要程式碼如下：

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(resignRespond)];
    tap.delegate = self;
    [self.view addGestureRecognizer:tap];
    [tap release];
 

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isKindOfClass:[UIButton class]])
    {
        return NO;
    }
    return YES;
}