Objective-C Beginner's Guide

Cocoa Dev Central: Learn Objective-C Objective-C Objective-C is the primary language used to write Mac software. If you're comfortable with basic object-oriented concepts and the C language, Objective-C will make a lot of sense. If you don't know C, you should read the C Tutorial first. This tutorial is written and illustrated by Scott Stevenson Copyright © 2008 Scott Stevenson Calling Methods To get started as quickly as possible, let's look at some simple examples. [object method]; [object methodWithInput:input]; Methods can return a value: output = [object methodWithOutput]; output = [object methodWithInputAndOutput:input]; You can call methods on classes too, which is how you create objects. id myObject = [NSString string]; The id type means that the myObject variable can refer to any kind of object, so the actual class and the methods it implements aren't known when you compile the app. In this example, it's obvious the object type will be an NSString, so we can change the type: NSString* myString = [NSString string]; Accessors

Multithreading and Grand Central Dispatch on iOS for Beginners Tutorial Convert a slow, unresponsive app to a speedy cheetah with Grand Central Dispatch! Have you ever written an app where you tried to do something, and there was a long pause while the UI was unresponsive? This is usually a sign that your app needs multithreading! In this tutorial, you’ll get hands on experience with the core multithreading API available on iOS: Grand Central Dispatch. You’ll take an app that doesn’t use multithreading at all (and hence is very unresponsive), and convert it to use multithreading. You’ll be shocked by the difference! This tutorial assumes you are familiar with the basics of iOS development. Without further ado, take a swig of soda or chew some bubble gum and begin this tutorial at the same time – and you’re already on your way to multithreading! Why Should I Care? “Ahem, so why are you telling me this? If you’re like a certain puppet, you might still be skeptical why you should care about all this multithreading business. Go ahead and tap the “Grab!” …waiting…

Learning Objective-C: A Primer Objective-C is the primary programming language you use when writing software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods. At a Glance This document introduces the Objective-C language and offers extensive examples of its use. An App Is Built from a Network of Objects When building apps for OS X or iOS, you’ll spend most of your time working with objects. If you’re writing your own class, start by providing a description of the class that details the intended public interface to instances of the class. Categories Extend Existing Classes Rather than creating an entirely new class to provide minor additional capabilities over an existing class, it’s possible to define a category to add custom behavior to an existing class. Protocols Define Messaging Contracts Prerequisites

Objective-C стал третим по популярности языком программирования 7 июля 2012 в 14:16 Прежде, чем вы продолжите чтение:Да, я знаю, что некоторые ставят под сомнение практическую ценность индекса TIOBEДа, я знаю, что некоторые ставят под сомнение методологию расчета индекса TIOBEтем не менее Язык программирования Objective-C продемонстрировал взрывной рост популярности и закрепился на третьей позиции индекса TIOBIE. Только зарегистрированные пользователи могут оставлять комментарии. Войдите, пожалуйста. The Objective-C Programming Language: Introduction Objective-C is the primary programming language you use when writing software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime. Objective-C inherits the syntax, primitive types, and flow control statements of C and adds syntax for defining classes and methods. At a Glance This document introduces the Objective-C language and offers extensive examples of its use. An App Is Built from a Network of Objects When building apps for OS X or iOS, you’ll spend most of your time working with objects. If you’re writing your own class, start by providing a description of the class that details the intended public interface to instances of the class. Categories Extend Existing Classes Rather than creating an entirely new class to provide minor additional capabilities over an existing class, it’s possible to define a category to add custom behavior to an existing class. Protocols Define Messaging Contracts Prerequisites

Using the Stepper Control in iPhone | iPhone Tutorial | iPhone iOS4 iPad SDK Development In Xcode 4 and iOS version 5, we have a new control available for use: the UIStepper control. The stepper control allows the user to increment or decrement a value. In this blog, we will see how to use stepper controls to implement a simple four – digit combination lock. So, let’s get started! First, open Xcode and select “Create a new Xcode project.” Click Next, choose a location to save the file, and click Create. Once the application has been created, open the MainStoryboard.storyboard file by selecting it in the Project Navigator. Select all four of the stepper controls by dragging a selection box around them. This will change the value for all four of the stepper controls. Open the ViewController.h file, and add the properties and methods shown in bold below. #import <UIKit/UIKit.h> @interface ViewController : UIViewController - (IBAction)stepperValueChanged:(UIStepper *)sender;- (IBAction)checkCombination:(UIButton *)sender; @end #import "ViewController.h" @interface ViewController ()

Objective-C Objective-C source code program files usually have .m filename extensions, while Objective-C header files have .h extensions, the same as for C header files. History[edit] Objective-C was created primarily by Brad Cox and Tom Love in the early 1980s at their company Stepstone.[2] Both had been introduced to Smalltalk while at ITT Corporation's Programming Technology Center in 1981. The earliest work on Objective-C traces back to around that time.[3] Cox was intrigued by problems of true reusability in software design and programming. He realized that a language like Smalltalk would be invaluable in building development environments for system developers at ITT. Cox began writing a pre-processor for C to add some of the capabilities of Smalltalk. In order to demonstrate that real progress could be made, Cox showed that making interchangeable software components really needed only a few practical changes to existing tools. Popularization through NeXT[edit] Syntax[edit] Messages[edit]

UnittWebSocketClient - unitt - How to use the UnittWebSocketClient project - Various projects used to provide all kinds of functionality from basic framework logic to build tools to web sockets and more UnittWebSocketClient is an API that allows you to use web sockets in your iOS Objective-C projects. It conforms to the initial & latest versions of web sockets. Simply import WebSocket.h. There are many different web socket servers out there and many to do not conform to the more recent versions of the specification. The client API tries to follow the client specification from javascript using Objective-C constructs. Include the CFNetwork and Security frameworks Add the "-all_load" flag to your "Other Linker Flags" in the "Build Settings" of your project Include the UnittWebSocketClient library in your project. 1. MyWebSocket.h #import "WebSocket.h" @interface MyWebSocket : NSObject <WebSocketDelegate>{} @end MyWebSocket.m #import "MyWebSocket.h" @implementation MyWebSocket #pragma mark Web Socket/** * Called when the web socket connects and is ready for reading and writing. **/- (void) didOpen{ NSLog(@"Socket is open for business.");} /** * Called when the web socket receives an error. 2. 3.

Google Objective-C Style Guide Unlike C++, Objective-C doesn't have a way to differentiate between public and private methods—everything is public. As a result, avoid placing methods in the public API unless they are actually expected to be used by a consumer of the class. This helps reduce the likelihood they'll be called when you're not expecting it. This includes methods that are being overridden from the parent class. For internal implementation methods, use a category defined in the implementation file as opposed to adding them to the public header. #import "GTMFoo.h" @interface GTMFoo (PrivateDelegateHandling) - (NSString *)doSomethingWithDelegate; // Declare private method @end @implementation GTMFoo (PrivateDelegateHandling) ... - (NSString *)doSomethingWithDelegate { // Implement this method } ... If you are using Objective-C 2.0, you should instead declare your private category using a class extension, for example: @interface GMFoo () { ... } Again, "private" methods are not really private.

Developing for a Jailbroken iPhone A to Z (iOS 4.0.1) | alexwhittemore.com Jailbreak Development for iOS4! Vital Stats: iOS 4.0.1 Xcode 3.2.3 Mac OSX 10.6.4 Snow Leopard iPhones 3G, 3GS, 4 (I finally have the whole lineup!) PROBLEM: I still can’t get iPhone 4 working. If you have one, please try it and help me out! The Goal: As usual, we want to be able to click “build and go” in Xcode and get the app we’re working on to load to the phone and start up. Abstract: The plan remains unchanged from the 3.x method. The Process: With Xcode closed and your device unplugged from the computer, If you’ve done this step before for previous guides, you may ignore it. At this point, you’re done telling Xcode it doesn’t need to codesign. With a new project open and ready to go (presumably you want to debug this one, though once you change these settings once, they’ll persist from project to project) open Project>Edit Project Settings (from the menu). Just hit cancel.And finally, to link the device and computer. Now you’re good to go! Debugger stopped. What gives?!

C and Objective C Compared Volume Number: 13 (1997) Issue Number: 3 Column Tag: Rhapsody By Michael Rutman, independent consultant What will programming in Objective-C mean to the C++ programmer Different Object Oriented Languages Almost all of us have heard the term object oriented programming, and most of us have used C++. How will Apple's purchase of NeXT, and NeXT's framework using Objective-C affect us as we develop software? C++ has a very diverse syntax, many language extensions, and hundreds of quirks. On the other hand, Objective-C is a blend of C and Smalltalk. How Do I Declare an Objective-C Object? C code is the same in Objective-C and C. Classes are different between C++ and Objective C, especially in the declaration of the classes. Some things to note The Objective-C class allows a method and a variable with the exact same name. Objective-C does not respect public and private as does C++. Objective-C does not have a constructor or destructor. How Does an Objective-C Method Look?

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