If a class conforms to a protocol what must it do?

What is a design pattern?

True or False? For an object to use constraints, it must have at least 3 constraint values.

Using UIViewController containment, which one of the following statements is true:

What framework is KVO (key value observing) a part of?

Which of the following accesses a variable in structure b?

Which one is an animatable property of a CALayer object?

A proper implementation of 'dealloc' method in your custom class must include:

Which statement contains a valid code for adding a method, which is not necessary to implement within a class which will conform to the protocol?

Correct statement for declaring a new category for UIColor class?

When deleting a CoreData NSManagedObject, you can specify to also delete its properties from the database, by setting a rule called: