Creating iOS 5 apps : develop and design by Rich Warren

By Rich Warren

Exhibits easy methods to improve and layout iOS five applications.

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Like pointers, arrays can become quite complex—particularly when passing them into or returning them from functions, and we haven’t even begun talking about advanced topics like multidimensional arrays and dynamic arrays. Fortunately, unless you are calling a C library, we will almost never use arrays in Objective-C. Instead, we will use one of Objective-C’s collection classes (NSArray, NSSet, or NSDictionary). For strings, we will use NSString. Structs Structs are the most flexible C data type.

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. 1). Integer values are used for storing discrete information. , BOOLs are used to represent YES and NO values, while chars are used 46 Chapter 2 Objective-C to represent ASCII characters).

26 Configuring the outlet note: Although Xcode generally does a great job auto-selecting the correct companion file, there may be times when it does not work properly or when you want to select a different file instead. You can do this in the jump bar. Selecting the leaf item will let you choose an alternate file based on the same general selection rules. Selecting the root item will allow you to choose different selection rules. Xcode provides a number of different, context-specific selection rules.

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