ActivityIndicator.swift

import SwiftUI
import UIKit

public struct ActivityIndicator: UIViewRepresentable {

    // MARK: - Properties

    public let style: UIActivityIndicatorView.Style
    @Binding public var isAnimating: Bool
    private var color: UIColor?

    // MARK: - Initializers

    public init(style: UIActivityIndicatorView.Style = .medium, isAnimating: Binding<Bool> = .constant(true)) {
        self.style = style
        _isAnimating = isAnimating
    }

    // MARK: - UIViewRepresentable

    public func makeUIView(context: UIViewRepresentableContext<ActivityIndicator>) -> UIActivityIndicatorView {
        UIActivityIndicatorView(style: style)
    }

    public func updateUIView(_ view: UIActivityIndicatorView, context: UIViewRepresentableContext<ActivityIndicator>) {
        isAnimating ? view.startAnimating() : view.stopAnimating()
        view.color = color
    }

    // MARK: - Modifiers

    public func color(_ color: UIColor?) -> some View {
        var view = self
        view.color = color
        return view
    }
}

#if DEBUG
struct ActivityIndicator_Previews: PreviewProvider {
    static var previews: some View {
        ActivityIndicator()
            .color(.red)
    }
}
#endif