Build a SwiftUI view in Swift Playgrounds

import SwiftUI
import PlaygroundSupport

struct ProgressView: View {
  
  var body: some View {
    Text("Hello, world!")
  }
  
}

PlaygroundPage.current.setLiveView(ProgressView())

Circle()
	.stroke(lineWidth: 25)
	.foregroundColor(.blue)

ProgressView().padding(150)

ZStack { }

Text("25%")

public struct ProgressView: View {

public var body: some View {

public init(_ progress: Double = 0.3) {

struct Preview: View {
 
  var body: some View {
    // ...
  }
  
}

VStack(spacing: 30) {
  ProgressView()
  ProgressView()
}

.padding(100)

.background(Color(UIColor.secondarySystemBackground))

Preview()

.environment(\.colorScheme, .dark)

@State var progress = 0.25

ProgressView(progress)

func increment() {
  self.progress += 0.25
}

func increment() {
  withAnimation {
    self.progress += 0.25
  }
}

Button(action: increment)

Button(action: increment) {
  Text("Increment Progress")
}