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Final code for part 2 of the article on recreating the Apple Watch activity rings in SwiftUI. add Timer base Animation
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/// Nested activity rings | |
struct ActivityRings: View { | |
var ringGap: CGFloat = 2 | |
@State var progressMove: Double | |
@State var progressExercise: Double | |
@State var progressStand: Double | |
var body: some View { | |
ZStack{ | |
GeometryReader { geo in | |
RadialGradient (gradient: Gradient (colors: [Color.black, Color.black]), | |
center: .center, startRadius: 5, endRadius: 500) | |
.scaleEffect(1.2) | |
ActivityRing( progressMax: progressMove, | |
lineWidth: geo.size.width/10, | |
gradient: .activityMove) | |
ActivityRing(progress: 0.0,progressMax: progressExercise, | |
lineWidth: geo.size.width/10, | |
gradient: .activityExercise) | |
.padding(geo.size.width/10 + ringGap) | |
ActivityRing(progress: 0.0, progressMax: progressStand, | |
lineWidth: geo.size.width/10, | |
gradient: .activityStand) | |
.padding(2 * (geo.size.width/10 + ringGap)) | |
} | |
} | |
VStack { | |
Slider(value: $progressMove, in: 0...2).accentColor(Gradient.activityMove.stops.first!.color) | |
Slider(value: $progressExercise, in: 0...2).accentColor(Gradient.activityExercise.stops.first!.color) | |
Slider(value: $progressStand, in: 0...2).accentColor(Gradient.activityStand.stops.first!.color) | |
}.padding().frame(width: 200, height: 100, alignment: .center) | |
} | |
} | |
/// Base activity ring | |
struct ActivityRing: View { | |
@State var progress: Double = 0.0 | |
var progressMax: Double | |
var lineWidth: CGFloat | |
var gradient: Gradient | |
let timer = Timer.publish(every: 0.1, on: .main, in: .common).autoconnect() | |
var body: some View { | |
ZStack { | |
// Background ring | |
Circle() | |
.stroke( | |
gradient.stops.last!.color, | |
style: .init(lineWidth: lineWidth) | |
) | |
.opacity(0.1) | |
// Main ring | |
Circle() | |
.rotation(.degrees(-90)) | |
.trim(from: 0, to: CGFloat(progress)) | |
.stroke( | |
angularGradient(), | |
style: .init(lineWidth: lineWidth, lineCap: .round) | |
) | |
.overlay( | |
GeometryReader { geometry in | |
// End round butt and shadow | |
Circle() | |
.fill(endButtColor()) | |
.frame(width: self.lineWidth, height: self.lineWidth) | |
.position(x: geometry.size.width / 2, y: geometry.size.height / 2) | |
.offset(x: min(geometry.size.width, geometry.size.height)/2) | |
.rotationEffect(.degrees(self.progress * 360 - 90)) | |
.shadow(color: .black, radius: self.lineWidth/4, x: 0, y: 0) | |
} | |
.clipShape( | |
// Clip end round line cap and shadow to front | |
Circle() | |
.rotation(.degrees(-90 + self.progress * 360 - 0.5)) | |
.trim(from: 0, to: 0.25) | |
.stroke(style: .init(lineWidth: self.lineWidth)) | |
) | |
) | |
}.onReceive(timer) { t in | |
withAnimation { | |
if progress >= progressMax { | |
//progress = 0 | |
} else { | |
progress += 0.2 | |
} | |
} | |
}.onTapGesture { | |
progress = 0.0 | |
} | |
.scaledToFit() | |
.padding(lineWidth/2) | |
} | |
func angularGradient() -> AngularGradient { | |
return AngularGradient(gradient: gradient, center: .center, startAngle: .degrees(-90), endAngle: .degrees((progress > 0.5 ? progress : 0.5) * 360 - 90)) | |
} | |
func endButtColor() -> Color { | |
let color = progress > 0.5 ? gradient.stops.last!.color : gradient.stops.first!.color.interpolateTo(color: gradient.stops.last!.color, fraction: 2 * progress) | |
return color | |
} | |
} | |
/// Activity app gradient colors | |
extension Gradient { | |
static var activityMove: Gradient { | |
return Gradient(colors: [ | |
Color(red: 0.8823529412, green: 0, blue: 0.07843137255), | |
Color(red: 1, green: 0.1960784314, blue: 0.5294117647) | |
]) | |
} | |
static var activityExercise: Gradient { | |
Gradient(colors: [ | |
Color(red: 0.2156862745, green: 0.862745098, blue: 0), | |
Color(red: 0.7176470588, green: 1, blue: 0) | |
]) | |
} | |
static var activityStand: Gradient { | |
Gradient(colors: [ | |
Color(red: 0, green: 0.7294117647, blue: 0.8823529412), | |
Color(red: 0, green: 0.9803921569, blue: 0.8156862745) | |
]) | |
} | |
} | |
/// SwiftUI color interpolation | |
extension Color { | |
var components: (r: Double, g: Double, b: Double, o: Double)? { | |
let uiColor: UIColor | |
var r: CGFloat = 0 | |
var g: CGFloat = 0 | |
var b: CGFloat = 0 | |
var o: CGFloat = 0 | |
if self.description.contains("NamedColor") { | |
let lowerBound = self.description.range(of: "name: \"")!.upperBound | |
let upperBound = self.description.range(of: "\", bundle")!.lowerBound | |
let assetsName = String(self.description[lowerBound..<upperBound]) | |
uiColor = UIColor(named: assetsName)! | |
} else { | |
uiColor = UIColor(self) | |
} | |
guard uiColor.getRed(&r, green: &g, blue: &b, alpha: &o) else { return nil } | |
return (Double(r), Double(g), Double(b), Double(o)) | |
} | |
func interpolateTo(color: Color, fraction: Double) -> Color { | |
let s = self.components! | |
let t = color.components! | |
let r: Double = s.r + (t.r - s.r) * fraction | |
let g: Double = s.g + (t.g - s.g) * fraction | |
let b: Double = s.b + (t.b - s.b) * fraction | |
let o: Double = s.o + (t.o - s.o) * fraction | |
return Color(red: r, green: g, blue: b, opacity: o) | |
} | |
} | |
struct ContentView_Previews: PreviewProvider { | |
static var previews: some View { | |
ActivityRings(progressMove: 0.8, progressExercise: 0.8, progressStand: 0.8) | |
} | |
} |
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