Swift Metal GPU for iOS App

I am looking to develop a mobile app for iOS. This app requires seamless integration of metal GPU with Swift to plot new, linear curves on the screen. I already wrote the application. What I need is someone to assist with using the new linear curves (ray tracing) to give me a working sample code I can tailor to what I need in my app. Basically I'm doing this using path today (CPU vs GPU) and I need it done in metal. I am using curves to be able to specify a radius of each point and have it make thicker lines with Metal.

Key Features I want are:
- Efficient use of Metal for graphics processing
- Swift programming language for iOS app development
- Plot lines accurately and dynamically on the screen using GPU

Ideal freelancer for this project should have:
- Strong Swift programming skills
- Experience in iOS app development
- Profound understanding of GPU programming using Metal
This unique combination of skills will accelerate the development process, ensuring a faster route to completion of this project.