如何获取 UIWebView 中选定文本的坐标(CGRect)?

问题描述

我有简单的 UIWebView 和加载的 html.我想显示指向所选文本的 PopoverView.我可以获取 UIMenuController 的 menuFrame 并使用它的 rect，但结果在屏幕的角落并不像我需要的那样准确.我可以计算屏幕大小并获取 menuFrame rect，然后我可以假设可以在哪里找到选择，但我想确切地知道所选文本在哪里.一般可以吗?

I have simple UIWebView with loaded html. I want to show the PopoverView pointed to the selected text. I can get the menuFrame of the UIMenuController and use its rect, but the result isn't as accurate at the corners of the screen as I need. I can calculate the screen size and get menuFrame rect and then I can suppose where the selection may be found, but I want exactly know where is the selected text. Is it generally possible?

推荐答案

您可以在所选文本的范围对象上使用 javascript 函数 getBoundingClientRect().我就是这样做的:

You can use the javascript function getBoundingClientRect() on the range object of the selected text. This is how I do it:

function getRectForSelectedText() {
    var selection = window.getSelection(); 
    var range = selection.getRangeAt(0); 
    var rect = range.getBoundingClientRect(); 
    return "{{" + rect.left + "," + rect.top + "}, {" + rect.width + "," + rect.height + "}}";
}

在 UIWebView 的一个类别中，你可以这样使用它:

and in a category on UIWebView, you could use it like such:

- (CGRect)rectForSelectedText{
    CGRect selectedTextFrame = CGRectFromString([self stringByEvaluatingJavaScriptFromString:@"getRectForSelectedText()"]);
    return selectedTextFrame;
}

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