Protocol conformance in Swift - Mini Project: Build & Apply

Protocol conformance

📖 Scenario: You are building a simple app that manages different types of vehicles. Each vehicle should be able to describe itself.

🎯 Goal: Create a protocol called Vehicle with a property and a method. Then create a struct that conforms to this protocol and implements the required property and method.

📋 What You'll Learn

Create a protocol named Vehicle with a var name: String { get } property and a func description() -> String method.

Create a struct named Car that conforms to the Vehicle protocol.

Implement the name property and the description() method inside Car.

Print the result of calling description() on an instance of Car.

💡 Why This Matters

🌍 Real World

Protocols help define common behavior for different types, like vehicles, so your app can work with them in a uniform way.

💼 Career

Understanding protocol conformance is essential for writing clean, reusable, and flexible Swift code in professional iOS development.

1

Create the Vehicle protocol

Create a protocol called Vehicle with a read-only property name of type String and a method description() that returns a String.

Swift

# Your code here

Need a hint?

Use the protocol keyword to define a protocol. The property name should be read-only, so use { get }.

2

Create the Car struct conforming to Vehicle

Create a struct named Car that conforms to the Vehicle protocol. Add a stored property name of type String.

Swift

protocol Vehicle {
    var name: String { get }
    func description() -> String
}

# Your code here

Need a hint?

Use struct Car: Vehicle to conform. Implement the name property as a stored property.

3

Implement the description() method in Car

Inside the Car struct, implement the description() method to return the string "This is a car named \(name).".

Swift

protocol Vehicle {
    var name: String { get }
    func description() -> String
}

struct Car: Vehicle {
    var name: String
    // Implement description() method here
    
}

Need a hint?

Return a string using string interpolation to include the name property.

4

Create an instance of Car and print its description

Create a constant myCar of type Car with the name "SwiftCar". Then print the result of calling myCar.description().

Swift

protocol Vehicle {
    var name: String { get }
    func description() -> String
}

struct Car: Vehicle {
    var name: String
    func description() -> String {
        return "This is a car named \(name)."
    }
}

# Your code here

Need a hint?

Create the instance with Car(name: "SwiftCar") and print the description.