Problems about protocol and drawing in SwiftUI - ios

Question

I want to define a Symbol protocol and write three different structs, Rectangle, Diamond and Oval. The first two are OK, but Oval returns UIBezierPath instead of Path. What should I do
//
// Symbol.swift
// Set
//
// Created by world on 2022/11/27.
//
import SwiftUI
protocol Symbol: Shape {
var numberOfSymbols: SetGame.Card.Number { get }
func drawing(_ path: Path, center: CGPoint, width: CGFloat, height: CGFloat) -> Path
}
extension Symbol {
func path(in rect: CGRect) -> Path {
let widthOfRect = rect.maxX - rect.minX
let heightOfRect = rect.maxY - rect.minY
let widthOfSymbol = widthOfRect
let heightOfSymbol = widthOfSymbol / 2
var path = Path()
switch numberOfSymbols {
case .one:
path = drawing(path, center: CGPoint(x: rect.midX, y: rect.midY), width: widthOfSymbol, height: heightOfSymbol)
case .two:
path = drawing(path, center: CGPoint(x: rect.midX, y: heightOfRect * 1/3), width: widthOfSymbol, height: heightOfSymbol)
path = drawing(path, center: CGPoint(x: rect.midX, y: heightOfRect * 2/3), width: widthOfSymbol, height: heightOfSymbol)
case .three:
path = drawing(path, center: CGPoint(x: rect.midX, y: heightOfRect * 1/4), width: widthOfSymbol, height: heightOfSymbol)
path = drawing(path, center: CGPoint(x: rect.midX, y: heightOfRect * 2/4), width: widthOfSymbol, height: heightOfSymbol)
path = drawing(path, center: CGPoint(x: rect.midX, y: heightOfRect * 3/4), width: widthOfSymbol, height: heightOfSymbol)
}
return path
}
}
This is the diamond part that has been implemented
result: Diamond Image
//
// Diamond.swift
// Set
//
// Created by world on 2022/11/27.
//
import SwiftUI
struct Diamond: Symbol {
var numberOfSymbols: SetGame.Card.Number
func drawing(_ path: Path, center: CGPoint, width: CGFloat, height: CGFloat) -> Path {
var path = path
let rightPoint = CGPoint(x: center.x + width/2, y: center.y)
path.move(to: rightPoint)
let bottomPoint = CGPoint(x: center.x, y: center.y + height/2)
let leftPoint = CGPoint(x: center.x - width/2 , y: center.y)
let topPoint = CGPoint(x: center.x, y: center.y - height/2)
path.addLine(to: bottomPoint)
path.addLine(to: leftPoint)
path.addLine(to: topPoint)
path.addLine(to: rightPoint)
return path
}
}
I haven't implemented the oval part yet
//
// Oval.swift
// Set
//
// Created by world on 2022/11/27.
//
import SwiftUI
struct Oval: Symbol {
var numberOfSymbols: SetGame.Card.Number
func drawing(_ path: Path, center: CGPoint, width: CGFloat, height: CGFloat) -> Path {
var path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: width, height: height), cornerRadius: 0)
// ...
}
}
Perhaps this can be solved by function overloading