Hello World in Swift

Creating Your First Swift Application

This guide will walk you through creating a simple "Hello, World!" application for WendyOS using Swift. This is a great way to prove that you can send your first app to your device and verify your development environment is set up correctly.

Prerequisites

• Wendy CLI installed on your development machine
• Swift 6.2 or later installed
• A WendyOS device plugged in over USB or connectable over Wi-Fi

Creating the Project

mkdir hello-world
cd hello-world

wendy init

hello-world/
├── Package.swift
└── Sources/
    └── hello-world/
        └── hello_world.swift

Running Your Application

You have two options to run your Swift application:

Option 1: Using Swift Directly

Run your application locally using the Swift Package Manager:

swift run

You should see output similar to:

Building for debugging...
[8/8] Applying hello-world
Build of product 'hello-world' complete! (1.93s)
Hello, world!

Option 2: Using Wendy CLI

Run your application using the Wendy CLI:

wendy run

You should see output similar to:

swift run
Building for debugging...
[8/8] Applying hello-world
Build of product 'hello-world' complete! (1.93s)
Hello, world!

Understanding the Code

The generated hello_world.swift file contains a simple Swift program:

@main
struct HelloWorld {
    static func main() {
        print("Hello, world!")
    }
}

This is the entry point for your WendyOS application. The @main attribute marks this as the main entry point, and the main() function is called when the application starts.

Verifying Deployment on Your Device

After deploying your application to a WendyOS device, you can verify it was successfully deployed and ran by listing the applications on your device:

wendy device apps list

You should see output similar to:

wendy device apps list
✔︎ Searching for WendyOS devices [5.1s]
✔︎ Listing applications: WendyOS Device

This confirms that your Hello World application has been successfully deployed and is running on your WendyOS device.

Next Steps

Now that you have a basic Swift application running:

• Learn how to deploy your app to a WendyOS device
• Explore WendyOS frameworks for hardware access
• Build more complex applications with user input and data processing