Updated for Xcode 14.0 beta 1
SwiftUI gives us the ProgressViewStyle
protocol to create custom designs for ProgressView
, allowing us to read how complete the progress view and take that into account in our design.
To make a custom ProgressView
style, you need to create a struct that has a makeBody()
method accepting the current configuration of the view. You can then go ahead and render the progress however you want – perhaps a text percentage, perhaps a growing circle, and so on – then return your finished layout to be rendered.
To demonstrate this, here’s a custom style that creates a gauge, showing progress as a stroked circle that completes as progress ramps up:
struct GaugeProgressStyle: ProgressViewStyle {
var strokeColor = Color.blue
var strokeWidth = 25.0
func makeBody(configuration: Configuration) -> some View {
let fractionCompleted = configuration.fractionCompleted ?? 0
return ZStack {
Circle()
.trim(from: 0, to: fractionCompleted)
.stroke(strokeColor, style: StrokeStyle(lineWidth: strokeWidth, lineCap: .round))
.rotationEffect(.degrees(-90))
}
}
}
// A view letting you adjust the progress with tap gestures
struct ContentView: View {
@State private var progress = 0.2
var body: some View {
ProgressView(value: progress, total: 1.0)
.progressViewStyle(GaugeProgressStyle())
.frame(width: 200, height: 200)
.contentShape(Rectangle())
.onTapGesture {
if progress < 1.0 {
withAnimation {
progress += 0.2
}
}
}
}
}
Download this as an Xcode project
Notice how my custom style rotates the circle anti-clockwise by 90 degrees, so the circle draws it progress from the top.
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