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Xcode 12 introduced a new tab system call Document Tabs. The old system is Window Tabs.

The new system screwed up many of the keyboard shortcuts I am used to.

One of the most troubling is that I can’t create a tab with ⌘ T anymore.

NOTE: This is written as of Xcode 12 beta 5, so things might change. It also depends on Xcode Preferences > Navigation. I use the Open in Place and Uses Tab.

Opening a file in document tabs

When you open a file, there is a new concept between 1) opening temporarily and 2) keeping in place.

Click a file to show in current editor. But this is only temporarily. If you click another file, it will replace the temporary file.

Double click or ⌘ ⌥ O a file to keep in the editor.

Hence, my most common workflow now consists of 2 steps.

1. ⌘ ⇧ O to quick search for a file
2. ⌘ ⌥ O to keep it in place

Other usual shortcuts:

⌘ ⇧ [ or ] to navigate left and right of the tabs.

⌘ W to close a document tab.

Window tabs

This seems like deprecated. Or we should try to minimize the use.

You cannot create a window tab using ⌘ T anymore. If you want to, make sure View > Show Window Tab Bar, then click on the + on the right of the bar.

⌘ ⇧ W to close window tab.

⌘ ⌥ ⇧ T to rename a window tab.

Make use of Editors

⌥ Click to open a file in the split editor.

⌘ CTRL T to open new editor.

⌘ ⇧ CTRL W to close split editor

Drag the tab to split editor, or to another window tab.

⌥ Click on a file to open in next editor.

⇧ ⌥ Click on a file, and move with mouse to an editor

Other shortcuts

⌘ ⇧ J to locate the file in the project navigator

CTRL 6 to dropdown the classes, methods and properties of a file. Following that, type to search further.

⌘ ⇧ A on a code under caret to show ⌥ions such as Callers, Rename, etc

Also Xcode tips in 2012.