On the topic of Dynamic Method Resolution, the books says:
Using this approach requires the implementation of the method to already be available, ready to plug in to the class dynamically. This method is often used to implement @dynamic properties (see Item 6), such as occurs in CoreData for accessing properties of NSManagedObjects, since the methods required to implement such properties can be known at compile time.
(emphasis mine)
I think it should read: "since the methods required to implement such properties can't be known at compile time."
On the topic of Dynamic Method Resolution, the books says:
(emphasis mine)
I think it should read: "since the methods required to implement such properties can't be known at compile time."