iOS Interview Questions And Answers For 1-2 years Experienced Candidates.

3/3/2016

1.How do I convert NSMutableArray to NSArray?

Answer:

In this post I have explained some key functionalities of NSArray and NSMutableArray.

I would like to elaborate some possible solutions with explanation.

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How to fix some common Xcode Errors

2/24/2016

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1.Application windows are expected to have a root view controller at the end of application launch

Answer:

Applications are expected to have a root view controller at the end of application launch.

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iOS Interview Questions And Answers part 16

12/17/2014

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1.What is the NSCoder class used for?
Answer:

NSCoder is an abstractClass which represents a stream of data. They are used in Archiving and Un-archiving objects. NSCoder objects are usually used in a method that is being implemented so that the class conforms to the protocol.

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Most Important iPhone interview Questions and Answers

12/15/2014

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1.Difference between method and selector?
Answer:

Selector:
A Selector is the name of a method.

Method :
A method is a combination of a selector and an implementation.

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Best Tutorials- Properties in objective C

12/14/2014

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Properties:

An object’s properties let other objects inspect or change its state.

But, in a well-designed object-oriented program, it’s not possible to directly access the internal state of an object.

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iOS Interview Questions And Answers Part12

12/1/2014

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1.If I call performSelector:
withObject:
afterDelay: – is the object retained?
Answer:
Yes the object is retained. It creates a timer that calls a selector on the current thread's run loop.

It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector.

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iOS Interview Questions And Answers Part13

12/1/2014

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1.Outline the class hierarchy for a UIButton until NSObject.

Answer:
UIButton inherits from UIControl, UIControl inherits from UIView, UIView inherits from UIResponder, UIResponder inherits from the root class NSObject.

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iOS Interview Questions And Answers Part11

11/24/2014

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1.What is the difference between the "copy" & "mutableCopy"?

Answer:-
copy returns an immutable (can't be modified) copy of the array.

mutableCopy returns a mutable (can be modified) copy of the array.

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Core Data Interview Questions and Answers

11/23/2014

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1.What is Core Data?
Answer:

Core Data is a framework that manages an object graph.

It is used to store data from your iPhone application into a Sqlite file which is present in the document directory of your application.
Read:
How to Explain iOS Application LifeCycle ?

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iOS Interview Questions And Answers Part 9

11/19/2014

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1.What are the ways to store data locally on iPhone ?
Answer:

Ans. We can store data locally in iOS devices through:

          1. Plist.
          2. NSUserDefaults.
          3. SQLite.
          4. CoreData.

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iOS Interview Questions And Answers Part 10

11/19/2014

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1.What you mean by auto layout in Objective C?
Answer :

Auto Layout is a new way to define dynamic GUIs. Before we had autoresizing masks, that described how a subview will resize or move when it’s superview is resized.

With Auto Layout you can do the same and also a lot more complicated GUIs quite easily.

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iOS Interview Questions And Answers Part 8

10/7/2014

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1.What's the difference between UITabBarController and UINavigationController?
Answer:

UITabBarController:

Applications use tab bar controllers to manage multiple distinct interfaces, each of which consists of any number of custom views and view controllers.

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iOS Interview Questions And Answers Part 7

10/3/2014

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1.Difference Between View and ViewController in iPhone?
Answer:

View Controller:

ViewController class is used to control the UIView instance (object) and the view which are present in the UIView (buttons,labels,table).

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iOS interview Questions and Answers Part 6

9/28/2014

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1.What is the difference Between APPKit and UIKit?
Answer:
AppKit

AppKit is included in the OS X SDK only.It provides all the classes and controls you need for creating Mac applications.Most of these classes share a common naming prefix starts with NS and classes you will be working with include NSWindow, NSButton, NSTableView.

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iOS Interview Questions with Answers part4

7/8/2014

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1.What are the differences between category and subclass?
Answer:

What is Category ?

Category in objective C allows you to extend the functionality of existing class without subclassing it.Category can add some extra functionalities to a class.

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iOS Interview Questions with Answers part3

6/23/2014

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1.What is NSRunloop?
Answer:

A run loop is an abstraction that (among other things) provides a mechanism to handle system input sources (sockets, ports, files, keyboard, mouse, timers, etc.

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iOS Interview Questions with Answers part2

6/11/2014

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1.NSBundle Main bundle?
Answer:-
It is used to pick the data from resources.

2.What is UI application?
Answer:-
Every iPhone has UI application.it is the starting point of the every application.It is responsible for initializing and display your application on UI Window and also responsible for loading your application.

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iOS Interview Questions And Answers part12

6/9/2014

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1.What is init ?
Answer:-
-init is an instance method, used to initialize a particular object.
2.What is new ?
Answer:-
NSObject implements a class method "new" which simply calls "alloc" and "init".

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WELCOME TO HUNTMYIDEAS

I am Jitendra Gochhayat,an iOS Developer,Designer,blogger,
from Odisha,India.
I write about blog tips and,
Make money online Tips,
Objective C tutorials

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