自定义形状，

demo/Extensions/TopRoundedRectangle.swift

@@ -0,0 +1,43 @@
+//
+//  TopRound.swift
+//  demo
+//
+//  Created by Jason on 2024/1/30.
+//
+
+import SwiftUI
+
+// 顶部圆角图形，兼容ios16以下版本用的
+struct TopRoundedRectangle: Shape {
+    let cornerRadius: Double
+
+    init(cornerRadius: Double = 0) {
+        self.cornerRadius = cornerRadius
+    }
+
+    func path(in rect: CGRect) -> Path {
+        Path { path in
+            path.move(to: CGPoint(x: rect.minX + cornerRadius, y: rect.minY))
+            path.addLine(to: CGPoint(x: rect.maxX - cornerRadius, y: rect.minY))
+            path.addArc(
+                center: CGPoint(x: rect.width - cornerRadius, y: cornerRadius),
+                radius: cornerRadius,
+                startAngle: Angle(degrees: -90),
+                endAngle: Angle(degrees: 0),
+                clockwise: false
+            )
+
+            path.addLine(to: CGPoint(x: rect.maxX, y: rect.maxY))
+            path.addLine(to: CGPoint(x: rect.minX, y: rect.maxY))
+            path.addLine(to: CGPoint(x: rect.minX, y: cornerRadius))
+
+            path.addArc(
+                center: CGPoint(x: cornerRadius, y: cornerRadius),
+                radius: cornerRadius,
+                startAngle: Angle(degrees: 180),
+                endAngle: Angle(degrees: 270),
+                clockwise: false
+            )
+        }
+    }
+}