unarchiver(_:willReplace:with:)
Informs the delegate that one object is being substituted for another.
Declaration
optional func unarchiver(_ unarchiver: NSKeyedUnarchiver, willReplace object: Any, with newObject: Any)Parameters
- unarchiver:
An unarchiver for which the receiver is the delegate.
- object:
An object in the archive.
- newObject:
The object with which
unarchiverwill replaceobject.
Discussion
This method is called even when the delegate itself is doing, or has done, the substitution with unarchiver(_:didDecode:).
The delegate may use this method if it is keeping track of the encoded or decoded objects.