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OVERVIEW ABOUT IOS FEATURES OF IOS OPERATING SYSTEM ENVIRONMENTAL SETUP BASICS OF OBJECTIVE C DATA TYPES IN OBJECTIVE-C ACTIONS AND OUTLETS EMAIL APPLICATION AUDIO AND VIDEOÂ FILE HANDLING
ABOUT IOS IOS IS AN OPERATING WHICH IS SPECIALLY MADE FOR IPHONE, IPAD, AND APPLE TV. THIS MOBILE OPERATING SYSTEM WAS DEVELOPED AND LAUNCHED BY APPLE INC. IOS WAS INITIALLY RELEASED IN THE YEAR 2007. THE IOS OPERATING SYSTEM IS DERIVED FROM OS X WHICH IS USED IN MOBILE COMPUTERS.
FEATURES OF IOS OPERATING SYSTEM Important features such as Siri, Maps, GPS, accelerometer, camera, safari, powerful APIs, multitouch, many gestures, high-end processor, etc. The number of iPhone and iPad users is increased steadily because of the features.
Environmental Setup Users have to download the Xcode file using the link given below. https://developer.apple.com/downloa ds/ Next the users need to drag the Xcode to the application. Interface Builder is a tool which is used to create a userfriendly interface.
Basics of objective C Objective-C is an object-oriented
programming language used in
iOS development.Â
In this programming language, file
declaration is made in interface
file whereas the file definition is
done in the implementation file.
Data types in Objective C NSString is used to represent the string. BOOL is used to represent Boolean. NSInteger is used to represent integer values. CGfloat is responsible for representing floating point values.
EMAIL APPLICATION Initially, you have to create the view based application. Then select the project file, targets and insert the messageUI.framework. After that, the programmers have to add a button in ViewController.xib and make an action to send the email.
Audio and video Initially, you have to create the view based application. Then select the project file, targets and insert the AVFoundation.framework  and MediaPlayer.framework. After that, the programmers have to add two buttons in ViewController.xib and make an action to play audio and video files.
FILE HANDLING Some key methods are used in iOS for handling files. The bundle application helps to read the files. The key methods are accessing and manipulating. We can achieve some of the file actions such as comparing two file contents, move the file, copy the file, read the file, remove the file, write the file, and also the users can check whether the file exists at a path or not.
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