如何计算特定字体和字体大小的文本字符串的宽度？ [英] How to calculate the width of a text string of a specific font and font-size?

问题描述

我有一个UILabel显示一些字符。像x，y或rpm。如何计算标签中的文本宽度（它不会占用整个可用空间）？这是为了自动布局，如果UILabel里面有一个较小的文本，另一个视图将有一个更大的框架矩形。当指定UIFont和字体大小时，是否有方法来计算文本的宽度？

I have a UILabel that displays some chars. Like "x", "y" or "rpm". How can I calculate the width of the text in the label (it does not ues the whole available space)? This is for automatic layouting, where another view will have a bigger frame rectangle if that UILabel has a smaller text inside. Are there methods to calculate that width of the text when a UIFont and font size is specified? There's also no line-break and just one single line.

推荐答案

你可以通过各种 sizeWithFont：中的方法 NSString UIKit添加。在你的情况下，最简单的变体应该足够了（因为你没有多行标签）：

You can do exactly that via the various sizeWithFont: methods in NSString UIKit Additions. In your case the simplest variant should suffice (since you don't have multi-line labels):

NSString *someString = @"Hello World";
UIFont *yourFont = // [UIFont ...]
CGSize stringBoundingBox = [someString sizeWithFont:yourFont];

此方法有多种变体，例如。有些考虑换行模式或最大尺寸。

There are several variations of this method, eg. some consider line break modes or maximum sizes.

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