Top iOS Interview Questions And Answers for Beginners

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Most Important iPhone interview Questions and Answers

1.What are the differences between Exceptions and Errors?
Answer:

Exceptions:
Exceptions are the programmer-level bugs like trying to access an object t that doesn’t exist.

They are designed to inform the developer that an unexpected condition occurred.

Since they usually result in the program crashing, exceptions should rarely occur in your production code.

Exceptions are represented by the NSException class

Errors:

Errors are user-level bugs like trying load a file that doesn’t exist. Because errors are expected during the normal execution of a program, you can manually check for these kinds of conditions and inform the user when they occur.

Most of the time, they should not cause your application to crash.
 Errors are represented by the NSError class.


2.What is the difference between Cocoa and Cocoa Touch?
Answer:-

Cocoa
Cocoa is the application framework for developing applications in  Mac OS X.
Cocoa is commonly referred to as the combination of the Foundation and AppKit frameworks, 

 Cocoa Touch
Cocoa Touch is the application framework for iPhone,iPad and iPod Touch .
Cocoa Touch is the combination of the Foundation and UIKit frameworks.

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3.What is Xcode?
Answer:

Xcode is an integrated development environment (IDE) containing a suite of software development tools developed by Apple for developing software for OS X and iOS.

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4.What is plist?
Answer:

In iPhone development, Property Lists are a key-value store that your application can use to save and retrieve persistent data.

Plist means PropertyList It is XML file format It is mainly user for store and retrieve  data It can store as  key-value pair

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5.What is IPA?
Answer:

IPA stands for "iOS App Store Package".
An .ipa file is an iPhone application archive file which stores an iPhone app. It is usually encrypted with Apple's FairPlay DRM technology. Each .ipa file is compressed with a binary for the ARM architecture and can only be installed on an iPhone, iPod Touch, or iPad

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6.What is xib?
Answer:-

The .xib file extension is most commonly associated with Interface Builder files.

Interface Builder is a graphics editing software that is used to design and test the user interfaces of a variety of software products.

The files with the .xib file extension contain development time format files.
These files contain the interface files created with the Interface Builder software.
                               
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