加手势

-(void)handleSingleTap:(UITapGestureRecognizer *)sender{    CGPoint pt = [sender locationInView:_contentWebView];    NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];    NSString *urlToSave = [_contentWebView stringByEvaluatingJavaScriptFromString:imgURL];    if (urlToSave.length > 0) {        //发送图片请求        NSLog(@"urlToSave :图片请求%@",urlToSave);        self.imageStr = [NSString stringWithFormat:@"%@",urlToSave];        [self getImageNum];    }}