Adds iOS 16 Lock Screen widget

AltWidget/ProgressRing.swift

@@ -0,0 +1,54 @@
+//
+//  ProgressRing.swift
+//  AltWidgetExtension
+//
+//  Created by Riley Testut on 8/17/22.
+//  Copyright © 2022 Riley Testut. All rights reserved.
+//
+
+import SwiftUI
+import WidgetKit
+
+struct ProgressRing<Content: View>: View
+{
+    let progress: Double
+    
+    private let content: Content
+    
+    init(progress: Double, @ViewBuilder content: () -> Content)
+    {
+        self.progress = progress
+        self.content = content()
+    }
+    
+    var body: some View {
+        ZStack(alignment: .center) {
+            ring(progress: 1.0)
+                .opacity(0.3)
+            
+            ring(progress: self.progress)
+            
+            content
+        }
+    }
+    
+    @ViewBuilder
+    private func ring(progress: Double) -> some View {
+        let strokeStyle = StrokeStyle(lineWidth: 4.0, lineCap: .round, lineJoin: .round)
+        
+        Circle()
+            .inset(by: 2.0)
+            .trim(from: 0.0, to: progress)
+            .rotation(Angle(degrees: -90), anchor: .center)
+            .stroke(style: strokeStyle)
+    }
+}
+
+struct ProgressRing_Previews: PreviewProvider {
+    static var previews: some View {
+        ProgressRing(progress: 0.5) {
+            EmptyView()
+        }
+        .previewContext(WidgetPreviewContext(family: .systemSmall))
+    }
+}