我如何知道文本是否超出文本视图的范围？ [英] How do I know if text exceeds the bounds of a text view?

问题描述

我想知道文本何时超出UITextView的界限并要求用户滚动。知道某个字体占用多少行是没用的 - 我怎么知道一定数量的文本会占用多少行？

I would like to know when text exceeds the bounds of a UITextView and requires the user to scroll. Knowing how many lines a certain font will occupy is useless - how do I know how many lines a certain amount of text will take up?

在上图中，我会添加淡入淡出效果，我可以优雅地切断文本视图。但是，如果没有要滚动的文本，则显示淡入淡出效果看起来不正确。

In the image above, I would add a fade effect so that I can cut off the text view gracefully. However, it does not look correct to display the fade if there is not enought text to scroll.

推荐答案

获取<$ c $设置文本后c> contentSize 。这是一个CGSize， height 将是UITextView在不滚动的情况下显示文本所需的高度。

Get contentSize after setting the text. It's a CGSize and the height will be the height required for the UITextView to display the text without scrolling.

myTextView.text = someText;
CGSize textSize = myTextView.contentSize;
float verticalSpaceNeededByText = textSize.height;

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