Question: What Is Protocol In Swift With Example?

What is protocol in Swift?

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.” …

Write flexible and extensible code in Swift with protocol-oriented programming..

What is the difference between delegate and protocol in Swift?

Protocol is a set of methods (either optional or required) that would be implemented by the class which conforms to that protocol. While, delegate is the reference to that class which conforms to that protocol and will adhere to implement methods defined in protocol. Have a look at this Apple doc for more detail.

Can Swift protocols have properties?

A protocol can require any conforming type to provide an instance property or type property with a particular name and type. The protocol doesn’t specify whether the property should be a stored property or a computed property—it only specifies the required property name and type.

Is a swift protocol an interface?

3 Answers. Essentially protocols are very similar to Java interfaces except for: … Swift protocols need to deal with value/reference through the use of the mutating keyword (because protocols can be implemented by structures, enumerations or classes). you can combine protocols at any point using “Protocol Composition”.

How do you name a protocol?

Protocols that describe what something is should read as nouns (e.g. Collection ). Protocols that describe a capability should be named using the suffixes able , ible , or ing (e.g. Equatable , ProgressReporting ). The names of other types, properties, variables, and constants should read as nouns.

How do you call a protocol in Swift?

First, we add @objc keyword in front of the protocol keyword. Then we add the @objc optional keyword in front of our optional method/variable. When you use a method or property in an optional requirement, its type automatically becomes an optional.

How do you use protocols?

A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. The protocol can then be adopted by a class, structure, or enumeration to provide an actual implementation of those requirements.

Why is swift called protocol oriented language?

Swift checks whether the requirements of the protocol are met for the classes it implemented at compile-time. So this allows developers to find out if there are any issues or bugs in code even before running the program. Also protocols brings more abstraction than classes do in swift.

What is generic in Swift?

Generic code enables you to write flexible, reusable functions and types that can work with any type, subject to requirements that you define. … Generics are one of the most powerful features of Swift, and much of the Swift standard library is built with generic code.

What is protocol in Swift stack overflow?

Protocol in swift is a pattern for allowing your classes to confirm to particular set of rules. In other words a protocol is a blueprint of methods and properties that are necessary for a particular task. You implement a protocol by confirming to it.

What is enum in Swift?

An enumeration defines a common type for a group of related values and enables you to work with those values in a type-safe way within your code. Enumerations in Swift are first-class types in their own right. …

What are types in Swift?

In Swift, there are two kinds of types: named types and compound types. A named type is a type that can be given a particular name when it’s defined. Named types include classes, structures, enumerations, and protocols. … A compound type is a type without a name, defined in the Swift language itself.

What is the use of guard in Swift?

A guard statement is used to transfer program control out of a scope if one or more conditions aren’t met. A guard statement has the following form: guard condition else { statements.

What is optionals in Swift?

An Optional is a type on its own, actually one of Swift 4’s new super-powered enums. It has two possible values, None and Some(T), where T is an associated value of the correct data type available in Swift 4. … Optionals are similar to using nil with pointers in Objective-C, but they work for any type, not just classes.

What is protocol and delegate in Swift?

Delegation can be used to respond to a particular action, or to retrieve data from an external source without needing to know the underlying type of that source. Apple notes that: A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.