Swift version: 5.1
These two forms of access control are similar, but there are two differences.
If you mark something
fileprivate it can be read anywhere in the same file it was declared – even outside the type. On the other hand, a
private property can only be read inside the type that declared it, or inside extensions to that type that were created in the same file.
In practice you’re likely to see
private used significantly more than
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Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.