By Matt Neuburg
Get a superior grounding in the entire basics of Cocoa Touch—and stay away from difficulties in the course of iPhone and iPad app improvement. With this revised and up-to-date variation, you’ll tips on how to paintings successfully with Objective-C and Xcode, utilizing iOS five and Xcode 4.2 good points, comparable to ARC reminiscence administration, storyboards, middle photo filters, and Emitter layers. This e-book covers iOS five in a rigorous, orderly fashion—ideal even if you’re coming near near iOS for the 1st time or want a connection with bolster current skills.Learn Objective-C language information and object-oriented programming ideas comprehend the anatomy of an Xcode undertaking and all of the phases of its lifecycle take hold of key Cocoa innovations corresponding to relationships among periods, receiving occasions, and model-view-controller structure know the way perspectives are controlled, drawn, composited, and lively Delve into Cocoa frameworks for sound, video, sensors, maps, and extra contact on complicated issues reminiscent of threading and networking receive an intensive grounding for exploring complicated iOS gains by yourself
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Additional info for Programming iOS 5, 2nd Edition
All the Objective-C stuff you’ll want to do with an object will expect the pointer, not the object at the far end of the pointer; behind the scenes, Objective-C itself will take care of the messy business of following the pointer to its block of memory and doing whatever needs to be done in that block of memory. This fact is extremely convenient for you as a programmer, but it does cause Objective-C users to speak a little loosely; we tend to say that “s is an NSString,” when of course it is actually a pointer to an NSString.
If you have a dictionary containing a key @"mykey" and you mistype this elsewhere in your code as @"myKey" or @"mikey", the compiler won’t complain, but your program will misbehave. The solution is to define a name for this literal string: #define MYKEY @"mykey" Now use MYKEY throughout your code instead of @"mykey", and if you mistype MYKEY the preprocess substitution won’t be performed and the compiler will complain, catching the mistake for you. 2), a more elaborate form of text substitution.
This fact is the basis of some highly sophisticated C idioms that you almost certainly won’t need to know about (which is why I don’t recommend that you read any of K&R Chapter 5 beyond section 3). C arrays rarely arise in practice when programming iOS, because you’ll work mostly with the NSArray object type instead. But here’s a case where they do. The function CGContextStrokeLineSegments is declared like this: void CGContextStrokeLineSegments ( CGContextRef c, const CGPoint points, size_t count ); The second parameter is an array (meaning a C array) of CGPoints.