Programming iOS 4: Fundamentals of iPhone, iPad, and iPod by Matt Neuburg

By Matt Neuburg

Get an effective grounding in all of the basics of Cocoa contact, and keep away from difficulties in the course of iPhone and iPad app improvement. With Programming iOS four, you are going to dig into Cocoa and how to paintings successfully with Objective-C and Xcode. This publication covers iOS four in a rigorous, orderly fashion—ideal no matter if you’re imminent iOS for the 1st time or want a connection with bolster latest skills.Learn Objective-C language information and object-oriented programming techniques comprehend the anatomy of an Xcode venture and the entire levels of its lifecycle seize key Cocoa suggestions reminiscent of relationships among sessions, receiving occasions, and model-view-controller structure understand how perspectives are controlled, drawn, composited, and lively Delve into Cocoa frameworks for sound, video, sensors, maps, and extra contact on complicated themes akin to threading and networking receive a radical grounding for exploring complicated iOS positive factors by yourself

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Pointers are very important in Objective-C, because Objective-C is all about objects (Chapter 2), and every variable referring to an object is itself a pointer. For example, I’ve already mentioned that the Objective-C string type is called NSString. "; In pure C, having declared a pointer-to-integer called intPtr, you are liable to speak later in your code of *intPtr. ” You speak of *intPtr because you wish to access the integer at the far end of the pointer. But in Objective-C, this is generally not the case.

In K&R C, declarations must precede all other statements, but in modern versions of C, this rule is relaxed so that you don’t have to declare a variable until just before you start using it. The usual convention is thus to declare a variable and assign it a value as it makes its first appearance on the scene: int height = 2; int width = height * 2; height = height + 1; int area = height * width; The basic built-in C data types are all numeric: char (one byte), int (four bytes), float and double (floating-point numbers), and varieties such as short (short integer), long (long integer), unsigned short, and so on.

Statements ... } The need for a counter intended to exist solely within the for loop is so common that C99 permits the declaration of the counter as part of the before-all statement; the declared variable’s scope is then inside the curly braces: for (int i = 1; i < 6; i++) { // ... statements ... } The for loop is one of the few areas in which Objective-C extends C’s flow-control syntax. Certain Objective-C objects represent enumerable collections of other objects; “enumerable” basically means that you can cycle through the collection, and cycling through a collection is called enumerating the collection.

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