RefreshButton

import SwiftUI

struct RefreshButton: View {
    @ObservedObject var model: RefreshButtonModel
    let action: () -> Void
    private let animationDuration = 1.0
    private var foreverAnimation: Animation {
        Animation.linear(duration: self.animationDuration)
            .repeatForever(autoreverses: false)
    }

    private var refreshImage: some View {
        Image(systemName: "arrow.counterclockwise.circle")
            .font(.system(.title))
    }

    private var rotatingRefreshImage: some View {
        refreshImage
            .rotationEffect(.degrees(self.model.isRotating ? 0 : 360))
            .onAppear {
                withAnimation(self.foreverAnimation) {
                    self.model.isRotating = true
                }
            }
    }

    var body: some View {
        Button(action: {
            self.model.showRotatingButton = true
            self.action()
        }, label: {
            if self.model.showRotatingButton {
                rotatingRefreshImage
            } else {
                refreshImage
            }
        })
            .frame(width: 44, height: 44)
    }
}