uiwebview 获取图片URL

file.m

UILongPressGestureRecognizer *gs = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(p_gestureRecognizerAction:)];  
    gs.numberOfTouchesRequired = 1;  
    [self.view addGestureRecognizer:gs];  
    
- (void)p_gestureRecognizerAction:(UIGestureRecognizer *)gestureRecognizer {  
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {  
        CGPoint touchPoint = [gestureRecognizer locationInView:gestureRecognizer.view];  
        if(self.interfaceOrientation == UIInterfaceOrientationPortrait || self.interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {  
            NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];  
            _urlToSave = [self.webview stringByEvaluatingJavaScriptFromString:imgURL];  
           NSLog(@"urlToSave :%@",_urlToSave);  
        }  
    }  
}