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Flowing Particle Background
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| import SwiftUI | |
| struct Particle: Hashable, Equatable { | |
| var x: Double | |
| var y: Double | |
| var dateTimeToHide: Date | |
| var fallSpeed: Double | |
| } | |
| class Particles: ObservableObject { | |
| var particleSet = Set<Particle>() | |
| func configure(using timelineDate: Date) { | |
| particleSet = particleSet.filter { $0.dateTimeToHide >= timelineDate } | |
| let particle = Particle( | |
| x: Double.random(in: 0...1), | |
| y: Double.random(in: 0...1), | |
| dateTimeToHide: timelineDate + Double.random(in: 1...5), | |
| fallSpeed: Double.random(in: 0...1) | |
| ) | |
| particleSet.insert(particle) | |
| } | |
| } | |
| struct FlowingParticlesView: View { | |
| @StateObject private var particles = Particles() | |
| var body: some View { | |
| ZStack { | |
| TimelineView(.animation) { timeline in | |
| Canvas { context, canvasSize in | |
| particles.configure(using: timeline.date) | |
| for particle in particles.particleSet { | |
| let timeDif = timeline.date.distance(to: particle.dateTimeToHide) | |
| let rect = CGRect( | |
| x: particle.x * canvasSize.width - (canvasSize.width * particle.x * timeDif), | |
| y: particle.y * canvasSize.height - (canvasSize.height * particle.y * timeDif * particle.fallSpeed), | |
| width: 5, | |
| height: 5) | |
| let shape = Circle().path(in: rect) | |
| let color: Color = [Color.white, Color.purple.opacity(0.8)].randomElement() ?? .white | |
| context.fill(shape, with: .color(color)) | |
| } | |
| } | |
| } | |
| .background(.black) | |
| VStack { | |
| Spacer() | |
| Text("You have\ncompleted\nfirst part of\nthe series!") | |
| .font(.system(size: 40, weight: .ultraLight)) | |
| .multilineTextAlignment(.leading) | |
| .padding(40) | |
| .overlay( | |
| RoundedRectangle(cornerRadius: 40) | |
| .stroke(Color.purple, lineWidth: 2) | |
| ) | |
| Spacer() | |
| Text("Keep Watching") | |
| .padding() | |
| .background(LinearGradient(colors: [.purple, .pink], startPoint: UnitPoint(x: 0, y: 0), endPoint: UnitPoint(x: 1, y: 1))) | |
| .cornerRadius(40) | |
| .foregroundColor(.white) | |
| .padding(10) | |
| .overlay( | |
| RoundedRectangle(cornerRadius: 40) | |
| .stroke(Color.purple, lineWidth: 2) | |
| ) | |
| .onTapGesture { | |
| print("Button tapped!") | |
| } | |
| } | |
| .padding(40) | |
| } | |
| .ignoresSafeArea() | |
| } | |
| } | |
| struct FlowingParticlesView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| FlowingParticlesView() | |
| } | |
| } |
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