当在XCode中从[Preferences]更改字体时(在复制一个与你想要的颜色匹配的模板后)，你可以选择多个条目并一次更改字体。使用[shift]选择一个范围或[cmd]选择多个单独的条目(例如，您可以同时选择'comments'和'strings'，只更改它们的字体)。

史蒂夫

Easisest解决方案:

关闭所有打开的项目。 Xcode >首选项>字体和颜色 确保按CMD+A选择所有可能的文本类型。然后从选择器中更改字体大小。

更新!看Xcode 9来拯救你! 现在你可以使用cmd +来增加Xcode 9的字体。 你花了5个主要版本才得到它，苹果!但迟到总比不到好。

我算出来了，不过不是很直观。

首先是一些痛点

When You try to change the font size directly using edit -> format -> font, nothing happens! - Not a good UX ... moreover why play dumb when you can tell user that they are using default or "System-owned" theme and they cannot change it? - Bad Design and more bad UX ... Why keep this option (Cmd t) alive, which by the way is most standard way to increase font size across most well behaved mac apps, if you do not want user to change the font this way? In Xcode preferences, when you try to change the font size by clicking on "fonts and colors", thats when XCode gives a pop-up saying what needs to be done. Also making a duplicate and then changing the fonts and colors is a lot of work rather than giving a button that says "Restore to Defaults" if Apple is so worried about the user messing up the default settings!

解决方案是-你需要复制主题，然后修改你刚刚制作的副本，并应用该副本-唷!

对于Xcode版本12.3及以上(不确定它是否适用于一些旧版本，但你可以尝试一下)

Xcode

-> Preferences -> Themes 
-> Select your favourite theme on left panel 
-> SourceEditor 
-> Select All (`cmd + A`) 
-> Click on T option 
-> Select size

以下步骤:

去xcode_preferences->然后选择字体和颜色->选择所有的文本选项->点击字体部分，改变你想要的字体

我使用cmd+，它很好地增加.. cmq-也一样