What is a category?

In ARC enabled project: [someObject release];

+(void)doSomething{}

What can be linked to an Obj-C program without any particular process?

Difference between NSInteger and int?

Which holdsdata and knows nothing about the user interface?

Which classes provides input data to a capture session?

To prevent memory leakage, iOS uses a policy based on a number, which is maintained by every reference object. What is it called?

which class object is used to manage capture activity and coordinates the flow of data from input devices to capture outputs?

In SiriKit, which INSearchCallHistorylntent class instance properties is deprecated in iOS1O onwards?

Apple Pay uses Passkit framework. Which classes in Passkit framework is used to store information about Apple Pay Cards?