NSAttributedString的boundingRectWithSize返回错误的大小

本文介绍了NSAttributedString的boundingRectWithSize返回错误的大小的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试获取属性字符串的rect，但是boundingRectWithSize调用不考虑我传入的大小，而是返回具有单行高度而不是大高度的rect(这是一个长字符串) .我通过传递一个很大的高度值和0来进行实验，如下面的代码所示，但是返回的rect始终是相同的.

I am trying to get the rect for an attributed string, but the boundingRectWithSize call is not respecting the size I pass in and is returning a rect with a single line height as opposed to a large height (it is a long string). I have experimented by passing in a very large value for the height and also 0 as in the code below, but the rect returned is always the same.

CGRect paragraphRect = [attributedText boundingRectWithSize:CGSizeMake(300,0.0)
  options:NSStringDrawingUsesDeviceMetrics
  context:nil];

这是损坏的吗，还是我需要做其他事情才能使它返回一个用于包装文本的矩形?

Is this broken, or do I need to do something else to have it returned a rect for wrapped text?

推荐答案

好像没有提供正确的选项.对于包装标签，请至少提供:

Looks like you weren't providing the correct options. For wrapping labels, provide at least:

CGRect paragraphRect =
  [attributedText boundingRectWithSize:CGSizeMake(300.f, CGFLOAT_MAX)
  options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
  context:nil];

注意:如果原始文本宽度小于300.f，则不会出现换行符，因此请确保装订大小正确，否则仍然会得到错误的结果.

Note: if the original text width is under 300.f there won't be line wrapping, so make sure the bound size is correct, otherwise you will still get wrong results.

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boundingRectWithSize