The projects page seems to be disappeared from Xcode 8. I used this page for deleting the derived data.
Any idea how can I delete derived data from within Xcode 8?
Many different solutions for this problem. Most of them work as well. Another shortcut seems to be added as well:
Shift + alt + command ⌘ + K
Will ask you to:
Are you sure you want to clean the build folder for “MyProject”?
This will delete all of the products and intermediate files in the build folder.
In most cases this would be enough to solve your problems.
UPDATE
As of Xcode 9 you'll be able to access the Derived Data folder by navigating to
File -> Project Settings
or if you use a Workspace:
File -> Workspace Settings