手势-webview与scrollView重复手势处理

// called when the recognition of one of gestureRecognizer or otherGestureRecognizer would be blocked by the other

// return YES to allow both to recognize simultaneously. the default implementation returns NO (by default no two gestures can be recognized simultaneously)

意思是说，返回yes的话，允许二者同时处理手势交互，（假如是webview的话，可以用添加个单击手势，但不会影响，webview的滚动手势），返回NO,不接受外部手势

//

// note: returning YES is guaranteed to allow simultaneous recognition. returning NO is not guaranteed to prevent simultaneous recognition, as the other gesture's delegate may return YES

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

//**例子

  NSURL *url = [NSURL URLWithString:urlArray[idx]];
                NSURLRequest *request = [NSURLRequest requestWithURL:url];
                [webView loadRequest:request];
                webView.userInteractionEnabled = YES;

                UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleWebView:)];

                singleTap.delegate= self;

                singleTap.cancelsTouchesInView =NO;

                [webView addGestureRecognizer:singleTap]; 

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return  Yes; //返回yes,webView上的手势起作用。
return No ;返回No,或不调用这个方法webview上的手势不起作用。
}