SwiftUIProgressBar.swift

struct ProgressBar: View {

    @Binding var progress: Double

    var body: some View {
        GeometryReader { geometry in
            ZStack(alignment: .leading) {
                Rectangle()
                    .foregroundColor(Color.gray)
                    .opacity(0.3)
                    .frame(width: geometry.size.width, height: geometry.size.height)
                Rectangle()
                    .foregroundColor(Color.blue)
                    .frame(width: geometry.size.width * CGFloat((self.progress)),
                           height: geometry.size.height)
                    .animation(.linear(duration: 0.5))
            }
            .cornerRadius(geometry.size.height / 2.0)
        }
    }
}