To increase font-size in Xcode is a pain.
When changing fonts in XCode from [Preferences] (after duplicating a template that matches colours close to what you want), you can select multiple entries and change the fonts all at once. Use [shift] to select a range or [cmd] to select multiple individual entries (e.g. you might select both 'comments' and 'strings' and change only their fonts).
Steve
You can use this plugin to change the font size using ⌘ +
or ⌘ -
(Control -
and Control +
in the latest versions of Xcode. The plugin developers changed the shortcut to avoid conflict with Interface Builder hotkeys):
https://github.com/zats/AdjustFontSize-Xcode-Plugin
Watch out because there's no undo!
Easisest solution:
Close any open projects.
Xcode > Preferences > Font & Colors
Make sure to press CMD+A to select all possible text types. Then change the font size from the picker.
You can use the following: