iphone - 如何向 UIWebView 子类添加手势识别器？

Question

如果我将手势识别器添加到名为 webView 的子类 UIWebView 实例，例如:

UILongPressGestureRecognizer *_longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(webViewGestureRecognized:)];
_longPressRecognizer.allowableMovement = 20;
_longPressRecognizer.minimumPressDuration = 1.0f;
[webView addGestureRecognizer:_longPressRecognizer];
[_longPressRecognizer release], _longPressRecognizer = nil; 

当我长按时，不会调用 -webViewGestureRecognized: 选择器。

我已经重写了委托(delegate)方法-gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:，但长按选择器仍然没有被调用。

- (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

我可以做些什么来在 WebView 上启用我自己的手势识别器吗？

Answer 1

据我所知，UIWebView 不应该像 Apple 文档中提到的那样进行子类化:

http://developer.apple.com/iphone/library/documentation/uikit/reference/UIWebView_Class/Reference/Reference.html