Swift version: 5.1
All view controllers must be accessible somehow, and any that aren’t will cause Xcode to throw up a warning: “View Controller is unreachable because it has no entry points, and no identifier for runtime access.” There are three ways you can fix this:
Once all view controllers have a way of accessing them the warning should disappear.
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This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.