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Chapter 12 - Swift - Outlets not declared using "weak"

[Book: Beginning iPhone development with Swift - Chapter 12]

Hi,

I was wondering why the outlets that are declared for the "FirstViewController" are not declared using the "weak" keyword i.e.

@IBOutlet var officerLabel: UILabel!
etc...

as opposed to:

@IBOutlet weak var officerLabel: UILabel!
etc...

... which I assumed was always necessary to avoid a strong reference cycle?

Have I misunderstood something about IBOutlets?

Any help is much appreciated.  Thanks in advance

Matt
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