How do you implement a protocol in Objective-C?

How do you implement a protocol in Objective-C?

In Objective-C, protocols are declared with the “@protocol” keyword. Below is an example of declaring a protocol containing one required method. In Swift, the syntax is a little different but the idea is the same. In Objective-C, you add the protocol name in angle brackets beside the class interface declaration.

What is Objective-C protocol?

Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. This chapter describes the syntax to define a formal protocol, and explains how to mark a class interface as conforming to a protocol, which means that the class must implement the required methods.

What are the types of protocols in Objective-C?

3 Answers. There are two varieties of protocol, formal and informal: An informal protocol is a category on NSObject, which implicitly makes almost all objects adopters of the protocol. (A category is a language feature that enables you to add methods to a class without subclassing it.)

What is implementation in Objective-C?

Implementation Files in Objective-C Implementation files implement all those things that we declare to be available in the header files. Every method that we say a class has must be defined with all its necessary code in the implementation file. This correlates to the @interface keyword for the header file.

What is difference between Objective-C and Swift?

As the performance of swift, it is 2.6x faster than Objective C and 8.4x faster than python. It got an encouraging syntax that make you write clean and consistent code. It provides improve readability and prevent errors….Difference between Swift and Objective C :

What does the symbol mean in Objective-C?

The @ character isn’t used in C or C++ identifiers, so it’s used to introduce Objective-C language keywords in a way that won’t conflict with the other languages’ keywords. This enables the “Objective” part of the language to freely intermix with the C or C++ part.

What is an interface in Objective-C?

In Objective-C, the class interface specifies exactly how a given type of object is intended to be used by other objects. In other words, it defines the public interface between instances of the class and the outside world.

Which is faster Objective-C or Swift?

Performance. The official Apple website claims that Swift is 2.6 times faster than Objective-C. Swift and Objective-C are both statistically typed languages that use the same iOS SDK and the high-quality Low Level Virtual Machine compiler.