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Circular progress bars, also known as donut charts, are a common visual element used to display progress or completion percentage in a circular format. In SwiftUI, you can create a custom circular progress bar by combining different views and applying transformations to them.
Here is an example of how you could create a custom circular progress bar in SwiftUI:
struct CircularProgressBar: View { @Binding var progress: Double var size: CGFloat = 200 var body: some View { ZStack { Circle() .stroke(Color.secondary, style: StrokeStyle(lineWidth: 10)) .frame(width: size, height: size) Circle() .trim(from: 0, to: CGFloat(min(progress, 1))) .stroke(Color.primary, style: StrokeStyle(lineWidth: 10, lineCap: .round)) .frame(width: size, height: size) .rotationEffect(Angle(degrees: -90)) .animation(.linear) Text("\(Int(progress * 100))%") .font(.title) .foregroundColor(.primary) } } }
This code creates a CircularProgressBar
struct that conforms to the View
protocol and has a @Binding
variable called progress
that is used to track the progress of the bar, and a size
variable that determines the size of the bar.
The body of the CircularProgressBar
consists of a ZStack
with three views: a circle for the track, a circle for the progress, and a text label for the progress percentage.
The track circle is created using the Circle
view and is styled with a secondary color and a line width of 10 points. The progress circle is created using the Circle
view and is styled with a primary color, a line width of 10 points, and a line cap of .round
. The trim
modifier is used to trim the progress circle from 0 to the progress
value, and the rotationEffect
modifier is used to rotate the circle by -90 degrees so that it starts at the top. The animation
modifier is used to animate the progress circle smoothly.
The text label is created using the Text
view and displays the progress percentage as an integer.
To use the CircularProgressBar
, you simply need to pass a binding to a Double
variable as the progress
argument and specify the size of the bar as the size
argument. The CircularProgressBar
will automatically update the progress and percentage based on the value of the progress
variable.
You can customize the appearance and behavior of the CircularProgressBar
by using different views and properties. For example, you could add a gradient fill to the progress circle, or use a different shape or color for the track or text label. You could also add a gesture or animation to the CircularProgressBar
to make it more interactive.
struct ContentView: View { @State var progress = 0.2 var body: some View { VStack { CircularProgressBar(progress: $progress) } .padding() } }
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