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Clicking the word UIApplicationDelegate in the editor will bring up a brief description of the protocol in the Quick Help inspector (the top half of the Utilities area). This technique lets us get a quick description of any classes, methods, or functions. Additionally, the Quick Help inspector contains hyperlinks to additional resources. Click the hyperlink version of the protocol’s name, and Xcode will open a full description from the developer’s documentation. Scroll down to the Tasks section to see a full list of methods.
You can use any valid C code in an Objective-C project. This gives us access to numerous third-party libraries, in addition to the Objective-C and C frameworks. Objective-C borrows much of its object syntax from Smalltalk. Smalltalk, one of the earliest object-oriented languages, was designed to be simple—both easy to implement and easy to learn. Despite its age, Smalltalk remains one of the most innovative program languages on the market. Many modern languages are just now rediscovering techniques originally developed in Smalltalk.
Our programs are basically a list of steps that define data and then manipulate it. C Data Types Objective-C is built upon the C programming language. As a result, the C data types are some of the most primitive building blocks available. All other data structures are just advanced techniques for combining C types in increasingly complex ways. All C data types are, at their root, fixed-length strings of 1s and 0s either 8, 16, 32, or 64 bits long. The different data types simply define how we interpret those bits.