iOS Operating System

iOS is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.

1. Mobile Programming Date: 29 April 2020 University of Duhok, Computer Science Dept . By Jawaher A.Fadhil B.SC in Electronics Engineering M.Tech in Computer Engineering 2019-2020 iOS Operating System 1

2. What is iOS ? iOS is a mobile operating system developed by Apple Inc. It is the second most popular mobile device in the world after Android . The  iOS mobile apps  can be downloaded from Apple’s App Store. 2

3. What is iOS ? The iOS apps are programmed in Objective C, C, and C++ languages. Version updates for iOS are released through iTunes software until the introduction of iOS 5 in 2011. Now, the software updates and data sync can happen wirelessly through Apple iCloud service. iOS has expanded its market by introducing new products powered by Apple like iWatch and AppleTV . AppleTV iWatch 3

4. iTunes is a media player, media library, Internet radio broadcaster, mobile device management utility, and the client app for iTunes Store, developed by Apple Inc. iCloud  is a cloud storage and cloud computing  service  from Apple Inc .   iCloud  enables users to store data such as documents, photos, and music on remote servers for download to iOS , macOS or Windows devices, to share and send data to other users, and to manage their Apple devices if lost or stolen iTunes9 for Mac iCloud 4

5. iOS Architecture iOS Architecture is also a layered one. Each layer is built with a variety of frameworks which can be assimilated in the iOS apps. 5

6. iOS Architecture 1. Core OS-  This layer is the foundation layer of the OS on which other layers are dependent. This layer is responsible for managing memory, system and OS tasks, networking and also interacts directly with the hardware. 6

7. iOS Architecture 2. Core Services Layer-   It consists of technologies that provide certain services to the app. It contains high-level features like iCloud storage . The core services include address book framework (provides access to contacts and user database ). Core Data (to manage the data model of a model view controller app ). Core Foundation ( Technologies to provide Data management services to IOS) Foundation (Using Objective C ) 7

8. iOS Architecture 3. Media Layer-  Media layer in iOS architecture enables the Graphics, Audio, Video technologies. 4. Cocoa Touch Layer–  The layer defines the basic application and support for key technologies such as multitasking, touch-based input, push notifications, and many high-level system services. It includes EventKit , GameKit , iAd , MapKit , PushKit , Twitter and UIKit frameworks. 8

9. Concepts of . ipa file and simulators IPA stands for iOS App Store Package. Any file with . ipa extension is an iOS application. It is an archive like ZIP that contains software sets used to develop the iOS app. Each . ipk file can be opened with Apple’s iTunes program. An IPA file has a binary for ARM architecture and can only be installed on an iOS device. IPA files cannot be installed on the iPhone Simulator. To run applications on the simulator, original project files which can be opened using the Xcode SDK are required. 9

10. iOS Simulators These are again programs to test and run the iOS applications without having any physical or the ‘real’ device. The iOS Simulator allows you to rapidly prototype and test builds of your app during the development process. Installed as part of the  Xcode tools  along with the iOS SDK, iOS Simulator runs on Mac and behaves like a standard Mac app while simulating an iPhone or the iPad environment. iOS simulators require MAC Environment and Xcode to function. Xcode11 10

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