[英]SwiftUI: How to create circular "progress" bar widget with a "fade out" start line if it is full (100%), like the "battery" widget on iOS
I am creating my own "circular" progress bar widget in SwiftUI and I am wondering how to approach implementing he following.我正在 SwiftUI 中创建自己的“圆形”进度条小部件,我想知道如何实现他所关注的。 If the circle progress is at 100% (meaning the circle if full) I want the "start" of the line to have a "faded out" effect, so that the start and end of the line do not "merge".
如果圆圈进度为 100%(表示圆圈已满),我希望线的“开始”具有“淡出”效果,以便线的开始和结束不会“合并”。 I saw this in the "battery" widgets on iOS. Here is a an example of "full" and "not full" battery widget:
我在 iOS 的“电池”小部件中看到了这一点。这是“充满”和“未充满”电池小部件的示例:
Here is my current widget code:这是我当前的小部件代码:
struct CircleProgressView: View {
@Binding var progress: Float
var body: some View {
ZStack {
Circle()
.stroke(lineWidth: 10)
.opacity(0.3)
.foregroundColor(Color(UIColor.systemGray3))
Circle()
.trim(from: 0.0, to: CGFloat(min(self.progress, 1.0)))
.stroke(style: StrokeStyle(lineWidth: 10, lineCap: .round, lineJoin: .round))
.foregroundColor(Color(UIColor.systemGreen))
.rotationEffect(Angle(degrees: 270.0))
}
.padding()
}
}
Any ideas will be helpful.任何想法都会有所帮助。
Here is an approach.这是一种方法。 I stacked 4 circles:
我叠了 4 个圆圈:
Here is the code:这是代码:
struct CircleProgressView: View {
@Binding var progress: Float
var body: some View {
ZStack {
// grey background circle
Circle()
.stroke(lineWidth: 30)
.opacity(0.3)
.foregroundColor(Color(UIColor.systemGray3))
// green base circle to receive shadow
Circle()
.trim(from: 0.0, to: CGFloat(min(self.progress, 0.5)))
.stroke(style: StrokeStyle(lineWidth: 30, lineCap: .round, lineJoin: .round))
.foregroundColor(Color(UIColor.systemGreen))
.rotationEffect(Angle(degrees: 270.0))
// point with shadow, clipped
Circle()
.trim(from: CGFloat(abs((min(progress, 1.0))-0.001)), to: CGFloat(abs((min(progress, 1.0))-0.0005)))
.stroke(style: StrokeStyle(lineWidth: 30, lineCap: .round, lineJoin: .round))
.foregroundColor(Color(UIColor.blue))
.shadow(color: .black, radius: 10, x: 0, y: 0)
.rotationEffect(Angle(degrees: 270.0))
.clipShape(
Circle().stroke(lineWidth: 30)
)
// green overlay circle to hide shadow on one side
Circle()
.trim(from: progress > 0.5 ? 0.25 : 0, to: CGFloat(min(self.progress, 1.0)))
.stroke(style: StrokeStyle(lineWidth: 30, lineCap: .round, lineJoin: .round))
.foregroundColor(Color(UIColor.systemGreen))
.rotationEffect(Angle(degrees: 270.0))
}
.padding()
}
}
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