Assuming that you provide default values for any new properties you introduce in a subclass, the following two rules apply:
Rule 1 If your subclass doesn’t define any designated initializers, it automatically inherits all of its superclass designated initializers.
Rule 2 If your subclass provides an implementation of all of its superclass designated initializers—either by inheriting them as per rule 1, or by providing a custom implementation as part of its definition—then it automatically inherits all of the superclass convenience initializers.
It appears that when a class adheres to the NSCoding protocol, it also must have an init method even when it is, say, inheriting from NSObject
Why is that the case?
Providing boilerplate code will make the compiler happy:
override init () {
super.init()
}This looks like syntactic sugar to me, and I don't expect this in Swift: An init method exists, apparent by the override keyword, and my method does nothing but call super. Yet, it is necessary.
What am I missing? Or is this a bug?
Oh, yes both Swift 3 and 4