iOS - 在 UITextView 中突出显示一个或多个单词 [英] iOS - Highlight One Word Or Multiple Words In A UITextView

问题描述

在我的项目中，我正在制作一小部分功能，允许用户通过一次突出显示一个单词来更快地阅读文本正文(在 UITextView 中)，或者如果用户愿意，甚至可以有多个.UITextView 中的每个单词都应该按照用户设置的速度一个一个地突出显示.

In my project, I'm making a small piece of functionality that allows a user to read a body of text (in a UITextView) faster by having one word being highlighted at a time, or even multiple if a user wants. One by one, each word in the UITextView should be highlighted at the speed the user sets.

有什么办法可以在 UITextView 中突出显示单词的背景?我认为它与属性字符串有关，但我找不到任何突出显示 NSString 背景的内容.

Is there any way I could highlight the background of a word in a UITextView? I think it has something to do with attributed strings, but I can't find anything that highlights the background of an NSString.

任何帮助或建议将不胜感激.谢谢.

Any help or advice would be appreciated. Thanks.

推荐答案

它确实与属性字符串有关.它与 NSString 无关，因为属性字符串不是 NSString；它是一个 NSAttributedString，或者它的可变子类 NSMutableAttributedString.您要做的是将 NSBackgroundColorAttributeName 设置为所需单词范围的背景颜色.

It does have to do with attributed strings. It has nothing to do with NSString, because an attributed string is not an NSString; it is an NSAttributedString, or its mutable subclass NSMutableAttributedString. What you want to do is set the NSBackgroundColorAttributeName to a background color for the range of the desired word.

我还应该提到，您可以通过干预构建 UITextView 绘图系统的 Text Kit 堆栈来获得更时髦的效果，如下图所示，我在一个单词周围绘制了一个矩形:

I should mention also that you can obtain snazzier effects by intervening in the Text Kit stack that constructs the UITextView's drawing system, as in this image where I'm drawing a rectangle around a word:

但是，背景颜色应该足以让您入门.

However, the background color should be enough to get you started.

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