UILabel并在自动调整后获取大小 [英] UILabel and getting the size after autofit

问题描述

我有一个UILabel实例，其默认字体大小为28，最小字体大小为16.我允许字体自动调整以适应此最小值，并且只能使用一行.

I have an instance of UILabel with a default font size of 28 and minimum font size of 16. I allow the font to auto-adjust to fit subject to this minimum and with one line only.

假设UILabel中有一些文本已自动调整为适合.如何获得新的字体大小，或更确切地说是如何应用应用于标签内容的比例因子?

Suppose I have some text in the UILabel that has been automatically adjusted to fit. How do I get the new font size, or to be more precise the scale factor applied to the label's content?

[NB.字体属性在自动调整下不会更改.]

[NB. The font property does not change under autofit.]

推荐答案

恐怕此计算是在绘制时完成的，并且无法访问(至少使用公共api)

I'm afraid that this calculation is done at draw time and not accessible (at least using public apis)

但是您应该能够使用UIKit

But you should be able to calculate it using one of UIKit sizeWithFont: methods, like UILabel does. (Beware that text metrics are CPU consuming... like when using them in a table cell)

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