IOS webview的一些手势

• 在weview上添加tap不好使
  解决：
  设置tap的代理，并实现
  - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
  返回yes，表示可以支持多个tap
• 使webview的长按复制等操作失效
  解决一：
  for (UIGestureRecognizer *gesture in [[[webView subviews][0] subviews][0] gestureRecognizers]) {
  if ([gesture isKindOfClass:[UILongPressGestureRecognizer class]]) {
  [gesture removeTarget:nil action:nil];
  }
  }

解决二：
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
for (UIGestureRecognizer *gesture in [[[webView subviews][0] subviews][0] gestureRecognizers]) {
if ([gesture isKindOfClass:[UILongPressGestureRecognizer class]]) {
[[[webView subviews][0] subviews][0] removeGestureRecognizer:gesture];
}
}
}
在didfinishload方法中添加 remove，因为：经测试webview load 数据后，会自动给webview的后台view上添加longpress手势。