突出阅读文本（在iPhone的故事书类型应用程序中） [英] Highlight Read-Along Text (in a storybook type app for iPhone)

问题描述

我喜欢这个功能（好吧，我的儿子喜欢它），我想实现它在一个孩子的书应用程序，我为iPhone做，但我无能为力的开始。我对所有的动画精灵/过渡的东西使用Cocos2d，但我不知道如何处理高亮文本，因为它是叙述。

I love this feature (well, my son loves it), and I would like to implement it in a kid's book app I am doing for iPhone, but I'm clueless where to begin. I'm using Cocos2d for all the animated sprite/transition stuff, but I'm not sure how to approach highlighting text as it is narrated.

示例：Jack和吉尔，喝了他们的馅料，太醉了去喝水。当文本被叙述时（.mp3在每个页面上播放），文本将被突出显示。我考虑调查Core动画，但我更熟悉Cocs2d在这一点（最脆弱的）。

Example: "Jack and Jill, drank their fill, and were too drunk to go for water." As the text is narrated (.mp3 plays on each page), the text would be highlighted. I considered investigating Core animation, but I"m more familiar with Cocs2d at this point (tenuously at best).

如果有人有一个线索，我真的很感激。

If someone has a clue, I'd really appreciate it.

Brendang

推荐答案

使用 UIStringDrawing 方法确定突出显示所需的rect，然后在文本视图下放置一个半透明 UIView （或任何cocos2d使用）。通过 NSTimer

Use the UIStringDrawing methods to determine the rect needed for the highlight, and then position a semitransparent UIView (or whatever cocos2d uses) under your text view. Synchronize with your audio via NSTimer

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