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. It also adds language-level support for object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime. 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 Protocols Define Messaging Contracts Blocks Simplify Common Tasks
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. 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. Download the starter project, open it up with Xcode, and compile and run.
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. It also adds language-level support for object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime. 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 Protocols Define Messaging Contracts Blocks Simplify Common Tasks
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. 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. 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. Love and Cox eventually formed a new venture, Productivity Products International (PPI), to commercialize their product, which coupled an Objective-C compiler with class libraries. Syntax[edit]
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 ()
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.
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. Please make sure you are using the correct client version for your server version. If you need a version prior to the hybi drafts, import WebSocket00.h. 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 /** * Called when the web socket receives an error. 2. @synthesize ws;
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++. 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. Objective-C uses + and - to differentiate between factory and instance methods, C++ uses static to specify a factory method. How Does an Objective-C Method Look?
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. 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! The problem that I run into is this: [Session started at 2010-08-04 20:35:02 -0400.]