Video Tutorial: Objective-C Runtime

Challenge

Your challenge is add some code to programmatically log out the methods of DateCalculator.

Hint: To do this, you will need to use class_copyMethodList and method_getName.

Download demo code

Download challenge solution

Helpful links

• Apple Documentation: Introspection
• Mike Ash: Objective-C Messaging
• Understanding the Objective-C Runtime
• More on Objc_msgSend
• Effective Objective-C by Matt Galloway

Errata

• At around 12:14 I say “and what this means is that you’re trying to call a method on an object that doesn’t exist.” That sentence is a little ambiguous – what I mean is you’re trying to call a method that doesn’t exist on an object.