指示元素文本的方向性。该值将传播到元素的子元素。
将 languageDirection 设置为 RTL 通过反转文本并适当地处理换行和断字来为从右到左 (RTL) 提供基本支持。但是，它不提供全面的 RTL 支持，因为这需要文本整形，包括字符的重新排序和 OpenType 字体功能支持。全面的 RTL 支持计划在未来的更新中提供，这将涉及用于处理语言、脚本和字体功能规范的其他 API。
为了增强此属性的 RTL 功能，用户可以探索 Unity Asset Store 中可用的第三方插件并使用 ITextElementExperimentalFeatures.renderedText
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