在旧金山使用fontWithSize API [英] Using the fontWithSize API with San Francisco

问题描述

通过调整跟踪并在SF Display和SF Text之间动态切换，iOS 9中新的San Francisco字体针对将要使用的大小进行了优化.在WWDC会话#804中指出，开发人员不应通过尝试使用fontWithName初始化UIFont来使用旧金山，例如:

The new San Francisco fonts in iOS 9 are optimized for the size it will be used at, by adjusting tracking and dynamically switching between SF Display and SF Text. It was noted in the WWDC session #804 developers should not use San Francisco by attempting to initialize a UIFont using fontWithName, for example:

UIFont *originalFont = [UIFont systemFontOfSize:11];
UIFont *newFont = [UIFont fontWithName:originalFont.fontName size:44];

这是因为使用fontWithName API时系统无法针对新大小优化字体.

This is because the system cannot optimize the font for the new size when using the fontWithName API.

相反，建议从原始字体中获取UIFontDescriptor并从中以新大小创建新字体，如下所示:

Instead it was recommended to get the UIFontDescriptor from the original font and create a new font from that at the new size, like so:

UIFont *originalFont = [UIFont systemFontOfSize:11];
UIFont *newFont = [UIFont fontWithDescriptor:originalFont.fontDescriptor size:44];

但是，他们没有提到以下内容是否允许优化:

However, they did not mention if the following allows for optimizations or not:

UIFont *originalFont = [UIFont systemFontOfSize:11];
UIFont *newFont = [originalFont fontWithSize:44];

我的问题是，fontWithSize API的行为是否像fontWithName API或fontWithDescriptor API一样-是否导致针对新大小的优化字体?

My question is, does the fontWithSize API behave like the fontWithName API or the fontWithDescriptor API - does it result in an optimized font for the new size or not?

推荐答案

我可以确认fontWithSize确实以新大小创建了优化的字体.

I can confirm fontWithSize does create an optimized font at the new size.

Printing description of originalFont:
<UICTFont: 0x7f8d9ba85340> font-family: ".SFUIText-Regular"; font-weight: normal; font-style: normal; font-size: 11.00pt

Printing description of newFont:
<UICTFont: 0x7f8d9ba7fe70> font-family: ".SFUIDisplay-Regular"; font-weight: normal; font-style: normal; font-size: 44.00pt

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