Hour 12. Routing Messages with Selectors
What You’ll Learn in This Hour
• Understanding the Target-Action Pattern
• Using SEL and @selector
• Invoking Selectors with NSInvocation
• Managing Messages with Runtime Tools
Getting Inside Objective-C Messages
By now, you should be familiar with Objective-C being described as being a dynamic messaging environment, and you have seen examples of messages in Hour 3, “Using Object-Oriented Features in Objective-C,” and in Hour 6, “Exploring Messages.” This hour looks inside the messages to see how they work. Because this is the heart of Objective-C and also because this is a significant way in which it differs from many other object-oriented programming languages, it is worthwhile to spend some time on ...
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