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Thursday, 24 September 2015

iPhone Interview Questions and Answers for freshers pdf free download

11. What is iPhone OS?
iPhone OS runs on iPhone and iPod touch devices.
Hardware devices are managed by iPhone OS and provides the technologies needed for implementing native applications on the phone.
The OS ships with several system applications such as Mail, Safari, Phone, which provide standard services to the user.

12. Difference between shallow copy and deep copy?
Shallow copy is also known as address copy. In this process you only copy address not actual data while in deep copy you copy data.
Suppose there are two objects A and B. A is pointing to a different array while B is pointing to different array. Now what I will do is following to do shallow copy.?Char *A = {‘a’,’b’,’c’};?Char *B = {‘x’,’y’,’z’};?B = A;?Now B is pointing is at same location where A pointer is pointing.Both A and B in this case sharing same data. if change is made both will get altered value of data.Advantage is that coping process is very fast and is independent of size of array.
while in deep copy data is also copied. This process is slow but Both A and B have their own copies and changes made to any copy, other will copy will not be affected.

13. What are the requirements for developing iPhone Apps?
Mac OS 10.5/10.6 iPhone SDK (Software Development Kit 3.0/4.0).
IPhone SDK consists of:
 IDE to develop iPhone Apps is XCode(This tool is inbuilt in iPhone SDK)
 Interface Builder This is used to design GUI of Apps(Inbuilt feature of iPhone SDK)
 Instruments  This is used to check any memory leaks in our apps (Inbuilt in SDK)
 Simulator This is used to test our apps before deploying into real device.

14. What are the popular apps of iPhone?
Face book-Social networking
Doodle Buddy-drawing
Pandora Radio-radio on our iPhone
Yelp-restaurant reviews

15. What is iPhone reference library?
iPhone reference library is a set of reference documents for iPhone OS. It can be downloaded by subscribing to the iPhone OS Library doc set. Select Help>Documentation from X code, and click the subscribe button next to the iPhone OS Library doc set, which appears in the left column.

16. What is iPhone sdk?
iPhone SDK is available with tools and interfaces needed for developing, installing and running custom native applications. Native applications are built using the iPhone OS’s system frameworks and Objective-C language and run directly on iPhone OS. Native applications are installed physically on a device and can run in presence or absence of network connection.

17. What is iPhone architecture?
It is similar to Mac OS X architecture
It acts as an intermediary between the iPhone and iPod hardware an the appearing applications on the screen
The user created applications never interact directly with the appropriate drivers, which protects the user applications from changes to the hardware.

18. What are the location services?
Applications such as Maps, camera and compass are allowed to use the information from cellular, Wi-Fi and Global Positioning System networks for determining the approximate locations.
The location is displayed on the screen, using a blue marker.

19. Describe the functionality of accelerometer of an iPhone ?
iPhone responds to motion using a built-in accelerometer.
The accelerometer detects the movement and changes the display accordingly, at the time of rotating iPhone from portrait to landscape.

20. Name the application thread from where UIKit classes should be used?
UIKit classes should be used only from an application’s main thread.  Note: The derived classes of UIResponder and the classes which manipulate application’s user interface should be used from application’s main thread.

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