What is an iPhone app?

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 An iPhone app is a program that runs on our iPhone/iPod Touch. It enables us to accomplish a certain task. They could be utility apps, games, enterprise apps, entertainment apps, apps to access our bank account etc.

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How to use nsxmlparser in Iphone SDk?

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NSXMLParser is a forward only reader or an event driven parser. What it means is, an event is raised whenever the parser comes across a start of an element, value, CDATA and so on. The delegate of NSXMLParser can then implement these events to capture XML data. Some of the events are raised multiple times like the start of an element, value of an element and so on. Since NSXMLParser is known as an event driven parser, we can only read data at the present node and cannot go back. The iPhone only supports  NSXMLParser  and not  NSXMLDocument , which loads the whole XML tree in memory. Books Application To understand how to use an instance of NSXMLParser, let’s create a simple navigation based application where we will list the title of the book in the table view and upon selecting a title, display the detail information in a detail view. Click  here  to see the sample XML file, used in this application. Create a new application in XCode by selecting Navig...
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Setup React Native Environment in Mac for iOS and Androd

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Step 0 — Install  npm and node.js Go to the node.js website ( https://nodejs.org/en/ )and install  node.js . npm is distributed with Node.js which means that when you download Node.js, you automatically get npm installed on your computer. npm is a package manger for JavaScript programming language, and the default package manager for Node.js Javascript runtime environment. Step 1 — Install Homebrew Open your terminal and run the following code to install  Homebrew  − /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" If for some reason copying and pasting the above didn’t work, please go directly to the  website  and copy and paste the command/code from there. Step 2 — Install Watchman Run the following code to install Watchman. brew install watchman Step 3 — Install React Native Now, run the following code to install React Native. sudo npm install -g react-native-cli Step 4 Android ...
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About Xcode 4 features

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Xcode 4 is the latest iteration of Apple’s integrated development environment (IDE), a complete tool set for building Mac OS X and iOS applications. The Xcode IDE includes a powerful source editor, a sophisticated graphical UI editor , and many other features fromhighly customization builds to support for source code repository management. Xcode can help you identify mistakes in both syntax and logic, and will even suggest fixes. Xcode 4 features a single window, called the  work space window , that holds most of the data you need. A second window, called the  Organizer window , is used for organizing your projects and reading documentation. For iOS projects, the Organizer window is also used to manage  devices. Xcode 4 has many features to make your job easier.          Xcode 4 has a single-window interface for all major workflows (you can have multiple workspace windows and multiple tabs per window)....
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