What is NSObject protocol?

What is NSObject protocol?

This protocol is imported into Swift with the name NSObjectProtocol . An object that conforms to this protocol can be considered a first-class object. Such an object can be asked about its: Class, and the place of its class in the inheritance hierarchy.

What kind of class is NSObject?

The root class of most Objective-C class hierarchies, from which subclasses inherit a basic interface to the runtime system and the ability to behave as Objective-C objects.

What does NSObject mean?

Essentially the NSObject is the base object type in Apple development. The NSObject defines all things that are shared between all classes that extend from it: NSObject is the root class of most Objective-C class hierarchies.

How do you subclass NSObject?

Well, the solution is to create a custom class. Create a new file and choose Cocoa Touch Class. Click Next and name the class “Person”, type “NSObject” for “Subclass of”, then click Next and Create to create the file. NSObject is what’s called a universal base class for all Cocoa Touch classes.

What NS stands for in Objective-C?

The Foundation Kit, or just Foundation for short, is an Objective-C framework in the OpenStep specification. It provides basic classes such as wrapper classes and data structure classes. This framework uses the prefix NS (for NeXTSTEP). It is also part of Cocoa and of the Swift standard library.

Why do we need NSObject in Swift?

This is because Objective-C is all about objects sending messages to other object. NSObject exists to mark a class in Swift that you will provide that basic functionality — basically Objective-C needs you to build up from a base class with your functionality on top (That is, NSObject is a Universal Base Class).

Can a struct inherit from NSObject?

1) Structs are passed by value, Class instances by reference 2) Classes can be subclassed, Structs can’t. Whether or not the Class is a subclass of NSObject is (mostly) irrelevant.

What is the use of NSObject in Swift?

Subclassing NSObject in Swift gets you Objective-C runtime flexibility but also Objective-C performance. Avoiding NSObject can improve performance if you don’t need Objective-C’s flexibility.

What does NS mean in coding?

NextStep. It’s a holdover from when objective-c was created by NeXT to write nextstep (later os x) and all associated apps, etc.

What NS stands for in iOS?

NextSTEP
Basically NS comes from NextSTEP, the original operating system that became Mac OS X when Apple acquired Next.