iOS 面试题与答案

问题 11. What are the methods to achieve concurrency in iOS?

The methods to achieve concurrency are:

• Dispatch queues
• Threads
• Operation Queues

问题 12. Define Cocoa/Cocoa touch.

It is used for building software codes to run on iOS for the iPad and iPhone. Cocoa Touch is written in the objective-C language and has a different set of graphical control elements to Cocoa.

问题 13. Explain the object.

Objects are mainly the variables that are of class types. It can be a function, method, data structure, or variable.

问题 14. Which framework is used to construct the application’s user interface?

UIKIT framework. It renders drawing models, windows, event handling, and views.

问题 15. What is iBeacon?

iBeacon enables mobile apps to listen to signals from beacons in the physical world and respond accordingly. It comprises two parts: a broadcaster and a receiver.