自定义形状，

demo/Views/Layouts/NavigationPageView.swift

@@ -7,14 +7,14 @@
 
 import SwiftUI
 
-struct NavigationPageView: View {
-    @Environment(\.dismiss) private var dismiss
+struct NavigationPageView<T: View>: View {
+    @Environment(\.presentationMode) private var presentationMode
     var title: String = ""
-    var content: any View
+    var content: T?
 
     var body: some View {
         ScrollView {
-            AnyView(content)
+            content
         }
         .navigationBarTitleDisplayMode(.inline)
         .navigationTitle(title)
@@ -22,7 +22,7 @@ struct NavigationPageView: View {
         .toolbar {
             ToolbarItem(placement: .navigationBarLeading) {
                 Button {
-                    dismiss()
+                    presentationMode.wrappedValue.dismiss()
                 } label: {
                     HStack {
                         Image(systemName: "chevron.backward")

demo/Views/Layouts/TabBarView.swift

@@ -13,6 +13,9 @@ struct TabBarView: View {
     var body: some View {
         NavigationView {
             ZStack {
+                Rectangle()
+                    .fill(Color.gray.opacity(0.2))
+                    .ignoresSafeArea()
                 Group {
                     switch selectedTab {
                     case .home:
@@ -34,10 +37,7 @@ struct TabBarView: View {
                             VStack(spacing: 6) {
                                 Image(systemName: item.icon).resizable().frame(width: 18, height: 18)
                                 Text(item.text)
-                                    .font(.caption)
-                                    .fontWeight(.regular)
-                                    .multilineTextAlignment(.center)
-                                    .lineLimit(1)
+                                    .navBarText()
                             }
                             .frame(maxWidth: .infinity)
                         })
@@ -46,12 +46,11 @@ struct TabBarView: View {
                     }
                 }
                 .padding(.vertical, 12.0)
-                .background(Color("TabBarColor"))
+                .background(Color("TabBarColor").ignoresSafeArea())
                 .frame(maxHeight: .infinity, alignment: .bottom)
                 .shadow(color: Color.gray.opacity(0.5), radius: 6, x: 0, y: 6)
             }
         }
-        .navigationViewStyle(.columns)
     }
 }