CandleKit: a native SwiftUI candlestick chart (no WebView)

Lalana Chamika — Sat, 03 Oct 2026 14:44:16 +0000

Every time I went looking for a candlestick chart for an iOS app, I found the same thing: a WebView wrapping TradingView's widget or some JS charting library. Works fine, but it means your "native" app ships a hidden browser just to draw some rectangles, and it never quite feels like the rest of your UI.

So I built CandleKit, an open-source candlestick chart for SwiftUI. The goal: make it feel like a control Apple shipped, not a chart library bolted on.

What it does

Momentum scrolling and pinch-to-zoom anchored under your fingers
Long-press crosshair that snaps between candles with a haptic tick
Live tick updates that redraw without disturbing your scroll position
Infinite history loading as you scroll back
Drag the price axis itself to rescale, double-tap to snap back to autoscale
Dynamic Type, dark mode via system colors, and VoiceOver gets a real Audio Graph (closing prices as pitch) instead of "chart, image"

The API, boring on purpose

You add it, and you draw it:

CandlestickChart(candles)
    .indicators([.sma(20), .ema(50)])
    .frame(height: 360)

Under the hood it's split into two targets. CandleKitCore is pure Foundation, no UI dependencies, so it builds on macOS and Linux too - it holds everything testable: viewport math, autoscaling, series diffing, indicator calculations. CandleKit sits on top and owns the SwiftUI view, the Canvas renderers, and a transparent UIKit view underneath that handles the gesture recognizers. Candles draw as a handful of batched paths, so draw calls don't scale up with however much history is loaded.

It's 0.1, pre-release. CandleKitCore has full unit test coverage, but the SwiftUI rendering side hasn't been profiled on device yet or snapshot-tested, so treat it accordingly. There's a demo app in the repo if you want to poke at it before wiring it into anything real.

Repo: github.com/LalanaChami/CandleKit. MIT licensed.

Genuinely want the feedback, especially if you try it on a device I haven't and something feels off. Bug reports, "this API is awkward," whatever, all useful.

Web Based Pharmacy Management system (MEAN Stack)

Lalana Chamika — Sun, 30 Aug 2020 10:08:16 +0000

https://github.com/LalanaChami/Pharmacy-Mangment-System/tree/contributor-branch

🦄 An Open Source MEAN stack web application (Pharmacy Management System)...
Contributions are more than welcome 😍 (Please clone the contributor branch for contributions)

Java Socket based chat application with SHA-1 hash encryption

Lalana Chamika — Wed, 24 Jun 2020 17:48:00 +0000

https://github.com/LalanaChami/Java-Chat-Application-Socket-Java-Swing-GUI-

Socket based chat application with a chat client and a chat server. With swing GUI and message encryption in SHA-1 hashing

DEV Community: Lalana Chamika

CandleKit: a native SwiftUI candlestick chart (no WebView)

What it does

The API, boring on purpose

Web Based Pharmacy Management system (MEAN Stack)

Java Socket based chat application with SHA-1 hash encryption