iOS Interview Questions for Fresher and Experienced in 2019
by Coding Tag CodingtagiOS
development has been emerging as one of the preferable career options for
fresher. An ample number of businesses have been orienting the iOS development
domain to their services, in order to gain more productivity. If you are also
looking to become an iOS developer, then you are on the correct platform. We
have prepared a list of iOS Interview Questions which will help you learn the
concept of iOS and prepare for the interview.
iOS Interview Questions
1. What is
iOS?
iOS can be
defined as the mobile operating system which is used to develop applications
for mobiles manufactured by Apple.
2. Which are
the four abstraction layers of iOS?
Four
abstraction layers of iOS are:
·
Core iOS is the lower level including all the security
frameworks and external hardware
·
Core Service layer including the services by the upper
layer
·
Media Layer including audio, video and other graphics
framework
·
Cocoa Touch Layer including all the iOS frameworks
3. How can be
concurrency attained in iOS?
The
concurrency can be attained in iOS with the help of the following three
approaches:
·
Operation Queues
·
Threads
·
Dispatch Queues
4. What is a suspended
state in iOS development?
Suspended
state in iOS is when the program is not executing but is stored in the memory. Further,
when an application with a low memory condition is attained, the system
eliminates the suspended state code to make space for the app.
5. The ULKit
classes are ought to be used by which application thread in iOS?
The ULKit
classes are used only by the main thread of the application.
6. What is
termed as an active state in iOS development?
An active
state in iOS development is the app which is consistently running in the
foreground and is handling events.
7. What is
ARC?
ARC is
known as the Automatic reference Counting and is used to count the reference to
the objects in iOS programming.
8. What will
be the output to following program?
let
numberSum = numbers.reduce(0, { $0 + $1})
If let
numbers = 9, 8,7,6,5?
Output: 35
Conclusion
So, that
was a list of some of the interview questions asked during iOS interview. You
can also visit HTML Interview Questions as HTML
also possesses an important part of iOS development. Note that these questions
are ideal for both fresher as well as experienced looking for iOS development
career.
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Created on Sep 20th 2019 02:34. Viewed 370 times.