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?

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

Which one is an animatable property of a CALayer object?

Which one is a valid property name of the NSError class?

Which of the following is true?

Which one is a valid attribute for a property declared in protocol?

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

What is a design pattern?

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

How can you add a new method foo to an existing class Bar?

Which framework lets you determine the current location or heading associated with a device?