What is the difference between category VS extension?

What is the difference between category VS extension?

Category and extension both are basically made to handle large code base, but category is a way to extend class API in multiple source files while extension is a way to add required methods outside the main interface file.

What is a category Objective-C?

A category allows you to add methods to an existing class—even to one for which you do not have the source. Categories are a powerful feature that allows you to extend the functionality of existing classes without subclassing. Check the apple doc for the Category in Objective-C.

What is the difference between subclassing inheritance vs extension?

In extension, there is no any specific name of extension in swift, but while subclassing there is another name of subclass. In extension, we can not add variables (fields), in subclass it is possible to declare variables.

What is category and extension in IOS?

A category allows you to add methods to an existing class—even to one for which you do not have the source. Class extensions are similar, but allow additional required APIs to be declared for a class in locations other than within the primary class @interface block.

What is the difference between category and extension in Objective-C?

Categories are an Objective-C language feature that let you add new methods to an existing class, much like C# extensions. Objective-C’s extensions are a special case of categories that let you define methods that must be declared in the main implementation block.

What is a category extension when is it used?

Category or Brand Extension is a strategy by which, a company uses the same brand to enter into a completely unrelated product segment. The company leverages on the brand equity and success of its existing brand to introduce the new product to increase market acceptance.

Why extensions Cannot have stored properties?

This happens because an extension is not a class, so it can’t contain stored properties. Even if they are weak properties. With that in mind, you have two main options: The swift way: Protocol + Protocol Extension.

What is category in iOS?

A category allows you to add methods to an existing class—even to one for which you do not have the source. Categories are a powerful feature that allows you to extend the functionality of existing classes without subclassing.

What are swift categories?

Categories are a way to modularize a class by spreading its implementation over many files. Extensions provide similar functionality. One of the most common uses of categories is to add methods to built-in data types like NSString or NSArray .

What is the difference between category and extension in Objective C?

What are the dangers of category extension?

Brand extension in unrelated markets may lead to loss of reliability if a brand name is extended too far. An organization must research the product categories in which the established brand name will work. There is a risk that the new product may generate implications that damage the image of the core/original brand.

What is an objectobjective-C extension?

Objective-C Extensions. A class extension bears some similarity to a category, but it can only be added to a class for which you have the source code at compile time (the class is compiled at the same time as the class extension).

What are categories in Objective-C?

This post is part of a series called Objective-C Succinctly. Categories are an Objective-C language feature that let you add new methods to an existing class, much like C# extensions. However, do not confuse C# extensions with Objective-C extensions.

What is the difference between class categories and class extensions?

Using categories, you can also distribute the implementation of your own classes among several files. Class extensions are similar, but allow additional required APIs to be declared for a class in locations other than within the primary class @interface block.

What is a class extension in Clang?

Class extensions are like anonymous categories, except that the methods they declare must be implemented in the main @implementation block for the corresponding class. Using the Clang/LLVM 2.0 compiler, you can also declare properties and instance variables in a class extension.