Question

I have a UIWebView in which it has a UITapGestureRecognizer and basically in my tap gesture recognizer I have:

- (CGPoint) pointsForImage:(UIGestureRecognizer *)sender
{
    CGPoint pt = [sender locationInView:self];

    NSString * offsetTop = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).offsetTop", pt.x, pt.y
                          ];

    NSString * offsetLeft = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).offsetLeft", pt.x, pt.y
                      ];

    NSString * scrollTop = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).parentNode.scrollTop", pt.x, pt.y
                              ];

    NSString * scrollLeft = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).parentNode.scrollLeft", pt.x, pt.y
                             ];


    float x = [[self stringByEvaluatingJavaScriptFromString:offsetTop] floatValue] - [[self stringByEvaluatingJavaScriptFromString:scrollTop] floatValue];
    float y = [[self stringByEvaluatingJavaScriptFromString:offsetLeft] floatValue] - [[self stringByEvaluatingJavaScriptFromString:scrollLeft] floatValue];

    CGPoint point = CGPointMake(x, y);
    return point;
}

基本上,我正试图做的是找到图像的顶端左侧X和头寸。并非与IDWebView有关,而是与内容观点有关。因此,我说,图像的位置是1 000个缩影子,但我现在将“IDWeb”电文减半,因此我想看到的数字是200个。我希望,这是有意义的。

Answer 1

Actually UIWebView has a UIScrollView. You can access the UIScrollView in UIWebView using scrollView property. Then get the contentOffset of the scrollView. Finally, you got the contentOffset of the scrollView and the image position relative to the UIWebView, you can calculate the point you want.

Try this piece of Javascript:

ThestringByEvaluatingJavaFromString below:

function getPosition(element){
    var el = element;
    var pos = [el.offsetLeft, el.offsetTop];
    var parent = el.offsetParent;
    if (parent != el) { 
      while (parent) {  
        pos[0] += parent.offsetLeft; 
        pos[1] += parent.offsetTop; 
        parent = parent.offsetParent;
      }
    }
    return pos;
}
getPosition(YourImageElement);

你们回去了图像位置。

友情链接