An advantage of protocols in Swift is that objects can conform to multiple protocols. Any type that satisfies the requirements of a protocol is said to conform to that protocol. Protocols on the other hand means a set of rules and regulation. Protocol is a very powerful feature of the Swift programming language.. Protocols are used to define a “blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.”. In this post we will see Delegates and Protocols in Swift. To make things easier, let's create the protocol in the current Bird.swift file (or you can create a new Swift file): protocol LizardProtocol { func crawl() func breathe() } Next, we'll apply "multiple inheritance", more accurately, implement multiple protocols by a single class. Later on when one tries to make use of that protocol by operating on type Creatable e.g. Only class types can use base classes and inheritance. What I had not noticed was a subtle change in the way you declare a class-only protocol in Swift 4. The reason is that the swift protocol is defined to the swift-objc header, then to your obj-c class definition, which then goes again to the swift-objc header. your representative or someone on your behalf. Skip to content. Lets break both the word Delegates and Protocols and try understand what they actually mean. Protocols allow you to group similar methods, functions and properties. Swift lets you specify these interface guarantees on class, struct and enum types. Protocols in swift defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. 2. The delegation pattern is common in many of Apple’s Cocoa API’s. A simple way of understanding the concept of a protocol is to know that it defines attributes, methods, and required tasks which are separated from functions. Swift checks for protocol conformity issues at compile-time, allowing developers to discover some fatal bugs in the code even before running the program. The protocol can then be adopted by a class, structure, or enumeration to provide an actual implementation of those requirements. Log in Create account DEV is a community of 518,714 amazing developers We're a place where coders share, stay up-to-date and grow their careers. Now the question is, what is Protocol exactly? Lizards will be able to breathe and crawl. Delegates as the name suggests, delegation i.e. When using it with Swift you create a class-only protocol that the delegate adopts. The good news for Lions running back D'Andre Swift is that he has been cleared from the concussion protocol. 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