Squircle in SwiftUI

squircle.swift

// Run in Swift Playground

import SwiftUI
import PlaygroundSupport

struct ContentView: View {
    var body: some View {
        Rectangle()
            .fill(Color.red)
            .frame(width: 200, height: 200)
            .clipShape(RoundedRectangle(cornerRadius: 50, style: .continuous))
    }
}

PlaygroundPage.current.setLiveView(ContentView())