I've been going throuh the HWS+ tutorial Animating Button Style and with Xcode 12.1 with iOS 14.1 this block no longer compiles and errors with: "Incorrect argument labels in call (have 'animationSpeed:_:label:', expected 'action:label:animationSpeed:')"

struct ContentView: View {
    var body: some View {
        AnimatedButton(animationSpeed: 5) {
            print("Pressed")
        } label: {
            Image(systemName: "star")
        }
    }
}

However I found that this formatting compiles and works as expected.

struct ContentView: View {
    var body: some View {
        AnimatedButton(action: {
            print("Pressed")
        }, label:{
            Image(systemName: "star")
        }, animationSpeed: 3)
    }
}

My question is why oh why Xcode?! Was there a swift change with closures that makes you have to do such things? Althought the solution makes sense somewhate this is kind of baffling... 🤷

Not sure what your "AnimatedButton" struct looks like but this is mine from the HWS+ tutorial

import SwiftUI

protocol AnimatingButtonStyle: ButtonStyle {
    init(animation: Double)
}

struct AnimatedButton<ButtonStyle: AnimatingButtonStyle, Content: View>: View {
    let buttonStyle: ButtonStyle.Type // THE ORDER IS IMPORTANT FOR THE CALL
    var animationSpeed = 5.0
    let action: () -> Void
    let label: () -> Content

    @State private var animation = 0.0

    var body: some View {
        Button(action: action, label: label)
            .buttonStyle(buttonStyle.init(animation: animation))
            .onAppear {
                withAnimation(Animation.easeOut(duration: self.animationSpeed).repeatForever(autoreverses: false)) {
                    self.animation = 1
                }
        }
    }
}

Then you make the configuration eg

struct PulsingButtonStyle: AnimatingButtonStyle {
    let animation: Double

    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .padding()
            .background(Color.blue)
            .clipShape(Circle())
            .foregroundColor(.white)
            .padding(4)
            .overlay(
                Circle()
                    .stroke(Color.blue, lineWidth: 2)
                    .scaleEffect(CGFloat(1 + animation))
                    .opacity(1 - animation)
                )
    }
}

then when you use in your view

AnimatedButton(buttonStyle: PulsingButtonStyle.self, animationSpeed: 1, action: {
    print("Pressed")
}) {
    Image(systemName: "star")
}

This works fine on Xcode 12.1 fine, so think maybe your code not the same