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 sizeWithFont:方法，就像UILabel一样. (请注意，文本指标会消耗CPU资源，就像在表单元格中使用它们一样)
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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