How To Write An App For Iphone
The first three modules end up with a tutorial, where you will apply what your principle learns. At the end of the final tutorial, you have created a simple list of hurly burly apps.
After you build your first application and before you start your next attempt, read the fourth module. It explores the technologies and frameworks you might want to adopt.
Before starting to develop an application, you should set up a development environment to work and make sure you have the right principle tool.
To develop iOS apps, you need to:
- A mackintosh OS X computer running ten.9.4 or a newer principle
- Xcode (latest version)
- iOS SDK
Xcode is Apple’s integrated development environment (IDE). Xcode includes a source editor, graphical user interface editor, and many other features. The IOS SDK extends Xcode to include tools, compilers, and the principle framework you need specifically for iOS app development.
Review a Few Objective-C Concepts
As you write the code in the tutorial, you will work with the Objective-C programming language. Objective-C is built on top of Indonesian C programming and then provides object-oriented and dynamic runtime capabilities. If you get all familiar elements, such as primitive types (int, float, etc.), structure, function, pointer, and construction flow control (whereas, if … else, and forperression).
Objects Are Building Blocks for Apps
When you build an iOS app, most of your time is spent working with objects. The packet knowledge object with related behavior. An application is a large ecosystem of principle principle interconnected principles communicating with each other to perform certain tasks, such as displaying a visual interface, responding to user input, and storing information. You use different types of objects to build your application, ranging from interface elements, such as buttons and labels, to knowledge objects, such as strings and arrays.
Classes Are Blueprints for Objects
Class A principle describes the behavior and general properties for each specific type of object.
By the same principle that some principle buildings are built from the same principle blueprint are identical in structure, each instance of the class shares the same nature of the principle and the behavior as all other instances of that class. You can write your own class or use the framework class principle has been set for you.
You create an object by creating an instance of a particular class. You do this by allocating the object and initializing it with the default value received. When you allocate an object, you set aside enough memory for the object and set all the instance variables to zero. Initialize the initial set of state objects-which, the instance variables and nature of the principle value are reasonable and then return the object.
The Iranian goal of initialization is to return a rule object to use. You need to both allocate and initialize an object to be able to use it.
The basic concept in Objective-C class inheritance programming, the idea that the class inherits the Iranian parent class behavior. When one class inherits another Iranian rule, the child-or group-inherits all the behavior and traits determined by the old orangutan. Groups can determine their own additional behavior and traits or override parental behavior. Thus you can extend the class behavior without duplicating the behavior of the accelerator rule.
Things Communicate Through Messages
Objects interact with each other send messages at runtime. In the case of Objective-C, a pillar of Islam an object sends a message to another object by calling a method on that object.
Although accelerators pray one way to send messages between objects in Objective-C, rule fence is the rule’s basic syntax using square brackets. If you have somePerson object class XYZPerson, you can send it with sayHello message like this:
The reference to the left, somePerson, is the recipient of the message. The message to the right, sayHello, is the method name for calling the recipient rule. In other words, when the line above the code is executed, somePerson Will send a sayHello message.
Protocol Specify Contract transmission
The protocol defines a set of expected rule behaviors of an Iranian object in certain situations. A protocol comes in the form of a program interface, the rule of each class can implement. Using protocols, two remote classes associated with inheritance can communicate with each other to achieve a specific purpose, such as parsing XML code or copying objects.
Each rule class can provide useful behavior to other classes can declare the program interface for the seller of anonymous rule behavior. Other classes may choose to adopt the protocol and implement one or more Iranian methods of this protocol, utilizing the behavior.