Objective-C provides a range of methods to work with NSNumber. Which of the following methods creates and returns an NSNumber object containing a given value, treating it as an NSInteger.

Which one is the base class of all objects in Objective-c ?

The description above is essentially related to which feature of Objective-C programming language ?

Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation.

In Objective-C, retain counts are the way in which memory is managed.

Memory management is one of the most important processes in any programming language

How is a selector typically represented in memory?

What's the difference between nil and NULL?

What are @try and @catch?

A UITableViewController's tableview must have its delegate explicitly set by the developer.

How to restore Consumable In-App Purchases?