By Nick Harris

IOS 7 replaced everything—get as much as speed!
iOS 7 is a tremendous shift within the appear and feel of apps—the first significant sea swap because the iPhone used to be first brought. For apps to mix in with the hot UI, each one wishes a whole redecorate. starting iOS Programming: development and Deploying iOS purposes starts off on the beginning—including an advent to aim C—and can provide the talents you want to get your apps up and working. writer Nick Harris has vast adventure constructing for iOS and gives an exceptional heritage for educating the construction blocks of app development.
- research Objective-C and the way it differs from different programming languages
- flip your app suggestion into an actionable plan
- construct each one function with the aid of standalone chapters
- gather your undertaking right into a real-world iOS app
Throughout the publication, youll be capable to scan with dozens of recipes from real-life situations, developing an app as you study. The books web site gains obtain pattern apps to persist with in addition to the guideline, and pattern code to demonstrate rules.

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Extra resources for Beginning iOS Programming Building and Deploying iOS Applications

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It acts the same in Objective-C by dereferencing the pointer and getting or setting the object in memory. Pointers are part of C. The memory of a computer can be thought of as a bunch of little boxes that hold values. Each of these boxes has an address. In this example the variable simpleClassInstance is a pointer. The value it holds in memory is not the object but instead the address of where the object exists in memory. It “points” to the object in another part of the memory. Figure 2-1 illustrates how this works.

Instead of explicitly releasing the object when you are done with it, you can call autorelease on it. This puts the object into the autorelease pool, that keeps track of objects within a particular scope of the program. When the program has exited that scope, all the objects in the autorelease pool are released. This is referred to as draining the pool. Listing 2-19 shows how you would implement this. LISTING 2-19: Using Autorelease in Objective-C - (void)simpleMethod { SimpleClass *simpleClassInstance = [[SimpleClass alloc] init]; [simpleClassInstance autorelease]; simpleClassInstance->firstInt = 5; simpleClassInstance->secondInt = 5; [simpleClass sum]; } Using alloc generally means that the code creating the object is its owner, which is why it gets a retain count of one.

LISTING 2-3: Declaring Enumerations // Objective C typedef enum { CardinalDirectionNorth, CardinalDirectionSouth, CardinalDirectionEast, CardinalDirectionWest } CardinalDirection; CardinalDirection windDirection = CardinalDirectionNorth; if(windDirection == CardinalDirectionNorth) // the wind is blowing north // Java and C# public enum CardinalDirection { NORTH, continues 12 ❘ CHAPTER 2 INTRODUCTION TO OBJECTIVE-C LISTING 2-3 (continued) SOUTH, EAST, WEST } CardinalDirection windDirection = CardinalDirectionNorth; if(windDirection == NORTH) // the wind is blowing north In C, C++, C#, and Objective-C, you can also create a struct.

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