FlywheelControl

A tactile, momentum-based radial control for SwiftUI — inspired by analog flywheels.

A SwiftUI-based, physics-inspired radial scroller for zoom, scrub, and value adjustments.
FlywheelControl mimics the feel of a real-world dial — complete with momentum, resistance, haptic feedback, and pen-friendly input.

We needed a more natural way to zoom — something better than pinch and expand.
So we built a rotary-style control that works with a finger or stylus, and feels real thanks to physics and CoreHaptics.

• 🎛️ Inertial spinning like a physical dial
• 📱 One-finger- and Apple Pencil-friendly
• 💥 Haptic ticks for tactile feedback
• 🎨 Fully SwiftUI and easy to customize
• 🧠 Decoupled: just emits delta values — you decide what to do with them

In Xcode:

1. Go to File → Add Packages…
2. Enter the URL: https://github.com/aweiner42/FlywheelControl
3. Choose the latest version (e.g., 1.0.0)

Or add it to your Package.swift:

.package(url: "https://github.com/aweiner42/FlywheelControl.git", from: "1.0.0")

Then add the dependency to your target:

.target(
    name: "YourApp",
    dependencies: ["FlywheelControl"]
)

Import the module where needed:

import FlywheelControl

let zoomManager = ZoomValueManager(
    getZoom: { camera.position.z },
    setZoom: { newZ in camera.position.z = newZ },
    min: -50,
    max: 50
)

FlywheelControl { delta in
    zoomManager.adjustZoom(by: delta)
}

• iOS 17.0+
• macOS 12.0+
• Swift 5.9+
• SwiftUI + Combine

FlywheelControl includes:

• 🔍 SwiftUI Previews
• 🧱 Modular design (no app dependencies)

Clone this repo and open FlywheelDemoApp/FlywheelDemoApp.xcodeproj to see the control in action.

Alan Weiner • SIME Corp
Inventor. Designer. Engineer. Collaborating with AI to shape intuitive interfaces.