如何与使用 UIStringDrawing/CoreText 绘制的字符串进行交互
我正在尝试开发一个突出显示某些关键词的应用程序。因此，我正在考虑使用 CoreText 或 UIStringDrawing 来突出显示这些单词（如粗体/下划线/斜体/颜色），因为 UITextView 似乎没有这些设施（而且我对 CATextLayer 没有任何运气） 。
在任何一种情况下，我都能够成功地操纵和绘制字符串。 （IE-我可以在字符串中找到重要的单词并应用适当的特征）。
我遇到的问题是，当以这种方式绘制文本时，它无法直接交互。鉴于用户将能够删除/添加文本到相关文本视图，这是一件很重要的事情。
目前，我已将绘图例程插入 UITextView 子类的 drawRect: 方法中（主要是为了看看我可以做我想做的事情）。 UITextView 是否有可以重写的不同方法，以便它使用我的代码来呈现其字符串？如果没有，我该如何去做我所描述的事情呢？
有关我正在谈论的内容的示例，请查看 Notes 应用程序如何查找并突出显示电话号码和地址。我不是在寻找电话号码或地址，但它表达了要点。
I am attempting to work on an app that highlights certain key words. For this reason, I am looking at using either CoreText or UIStringDrawing to highlight these words (As in bold/underline/italicize/color) since UITextView doesn't seem to have these facilities (And I haven't had any luck with CATextLayer).
In either case I am able to successfully manipulate and draw the string. (I.E- I can find my important words in a string and apply the appropriate traits).
The problem I am having is that when text is drawn this way, it cannot be interacted with directly. Seeing as the user will be able to delete/add text to the text view in question, this is an important thing to have.
At the moment I have stuck my drawing routines into the drawRect: method of a UITextView subclass (Mostly just to see that I can do what I want). Does UITextView have a different method that can be overridden so that it uses my code to render its string? If not, how might I go about doing what I've described?
For an example of what I am talking about, look at how the Notes app finds and highlights phone numbers and addresses. I'm not looking for phone numbers or addresses, but it gets the point across.
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经过一些额外的阅读后，您似乎需要子类化/重写很多方法才能创建您自己的可以绘制文本的文本视图。 Apple 的文档对此有所涉及，但没有详细介绍。
After a bit of additional reading, it seems that you need to subclass/override a LOT of methods in order to create your own text view whose text you can draw. Apple's docs touch on it, but they don't go much into detail.