Download E-books iOS 6 Programming Cookbook PDF

By Vandad Nahavandipoor

Overcome the vexing matters you’ll necessarily confront while growing apps for the iPhone, iPad, or iPod contact. by way of utilizing new and revised recipes during this up to date cookbook, you’ll fast study the stairs essential to write entire iOS apps—including how one can shop and guard facts, increase and animate photos, deal with documents and folders, and reap the benefits of Passbook.

Thoroughly up to date for iOS 6 SDK, this cookbook indicates you the way to take advantage of hundreds of thousands of strategies to resolve difficulties that builders of all degrees quite often face. each one recipe contains pattern code you should use correct away.

  • Use cross package to convey digitally-signed passes corresponding to loyalty cards
  • Define the format of UI parts with Cocoa car Layout
  • Develop location-aware apps
  • Get operating examples for imposing gesture recognizers
  • Use new Objective-C Runtime features
  • Play audio and video documents and entry the iPod library
  • Retrieve contacts and teams from the deal with Book
  • Determine digital camera availability and entry the photograph Library
  • Create multitasking-aware apps
  • Use occasion equipment to control calendars, dates, and events
  • Apply the accelerometer and gyroscope
  • Enhance your app with the iCloud service

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18 Typecasting with automated Reference Counting | fifty nine coreFoundationString, unknownObjectType, anotherString and the objCString vari- ables all aspect to an analogous string with the keep count number of two. five. the following cease is environment our powerful neighborhood variable objCString to nil. it will unlock this variable and our string’s continue count number will return to at least one. these types of neighborhood variables are nonetheless legitimate and you may learn from them as the hold count number of the string that every one of them element to remains to be 1. 6. Then we're explicitly liberating the price within the anotherString variable. this may set the discharge count number of our item from 1 to zero and our string item gets deallocated. At this element, you shouldn't use any of those neighborhood variables simply because they're pointing to a deallocated object—except for the objCString robust neighborhood variable, whose worth was once set to nil by way of us. See additionally Recipe 1. 17 1. 19 Delegating initiatives with Protocols challenge you need to be sure a definite item implements a collection of equipment or houses. answer Use a protocol. dialogue A protocol is the statement (as against implementation) of a collection of tools and/ or houses in a header dossier (usually with the extension of . h). Any item that you simply claim to comply to such protocol is chargeable for writing the implementation of these tools and houses, reckoning on even if the protocol specifies them as required or not obligatory. examine protocols as units of ideas, with a few ideas being non-compulsory and others vital. Any item asserting that it conforms to that protocol needs to stick with these ideas. Let’s see an easy instance of this. we'll cross forward and outline a protocol known as individual Protocol. For this, you want to create a brand new protocol dossier, so keep on with those steps first: 1. In Xcode, whereas your undertaking is open, visit the dossier menu after which select New → New File... 2. Now be sure iOS is the most class at the left part of the hot dossier conversation after which opt for the Cocoa contact subcategory. as soon as that's performed, decide upon the Objective-C Protocol merchandise and press subsequent (see determine 1-26). 60 | bankruptcy 1: The fundamentals Figure 1-26. making a new protocol three. Now you may be requested to save lots of this dossier and specify a reputation for it. supply it the identify PersonProtocol and press retailer (see determine 1-27). we have now our header dossier. Let’s get on with the particular announcement of our protocol. Our goal with this new PersonProtocol protocol is to manipulate the foundations on any type that impersonates a “Person,” or in different phrases, says that it's a individual category. for example, on your program, you could have a category named boy or girl, mom, Father, Son, Daughter, Stranger, and so on. you could then make most of these sessions comply with the individual Protocol protocol, so as to outline the kinds of habit each one of those sessions needs to enforce. Let’s say that, for everyone, we'd like at the very least a primary identify, a final identify, and an age: #import @protocol PersonProtocol @property (nonatomic, robust) NSString *firstName; @property (nonatomic, robust) NSString *lastName; @property (nonatomic, unsafe_unretained) NSUInteger age; @end Now let’s create a category referred to as Father and ensure that this type conforms to our PersonProtocol protocol.

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