从 iOS 17 Observation 迁移至 iOS 16 兼容的 Combine 架构

将最低部署版本降至 iOS 16，以 ObservableObject 替换 @Observable，新增导航与 UI 兼容层，并补充登录冒烟 UI 测试。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/Features/Statistics/API/StatisticsAPI.swift

@@ -6,7 +6,7 @@
 //
 
 import Foundation
-import Observation
+import Combine
 
 @MainActor
 /// 数据统计服务协议，抽象汇总和每日明细读取能力以便测试替换。
@@ -26,10 +26,9 @@ protocol StatisticsServing {
 }
 
 @MainActor
-@Observable
 /// 数据统计 API，封装摄影师和景区管理员两套统计接口。
 final class StatisticsAPI: StatisticsServing {
-    @ObservationIgnored private let client: APIClient
+    private let client: APIClient
 
     /// 初始化数据统计 API，并注入共享网络客户端。
     init(client: APIClient) {

suixinkan/Features/Statistics/ViewModels/StatisticsViewModel.swift

@@ -6,21 +6,20 @@
 //
 
 import Foundation
-import Observation
+import Combine
 
 @MainActor
-@Observable
 /// 数据统计页面 ViewModel，管理时间段、汇总数据、每日明细和分页状态。
-final class StatisticsViewModel {
-    var selectedPeriod: StatisticsPeriod = .today
-    private(set) var loading = false
-    private(set) var loadingMore = false
-    private(set) var summary = StatisticsSummaryResponse()
-    private(set) var dailyItems: [StatisticsDailyItem] = []
-    private(set) var totalDailyCount = 0
-    private(set) var lastRefreshAt: Date?
+final class StatisticsViewModel: ObservableObject {
+    @Published var selectedPeriod: StatisticsPeriod = .today
+    @Published private(set) var loading = false
+    @Published private(set) var loadingMore = false
+    @Published private(set) var summary = StatisticsSummaryResponse()
+    @Published private(set) var dailyItems: [StatisticsDailyItem] = []
+    @Published private(set) var totalDailyCount = 0
+    @Published private(set) var lastRefreshAt: Date?
 
-    private var page = 1
+    @Published private var page = 1
     private let pageSize = 15
 
     /// 当前日数据是否还有下一页。

suixinkan/Features/Statistics/Views/StatisticsView.swift

@@ -9,14 +9,14 @@ import SwiftUI
 
 /// 数据 Tab 根视图，展示订单统计汇总和每日明细。
 struct StatisticsView: View {
-    @Environment(AccountContext.self) private var accountContext
-    @Environment(PermissionContext.self) private var permissionContext
-    @Environment(StatisticsAPI.self) private var statisticsAPI
-    @Environment(ToastCenter.self) private var toastCenter
+    @EnvironmentObject private var accountContext: AccountContext
+    @EnvironmentObject private var permissionContext: PermissionContext
+    @Environment(\.statisticsAPI) private var statisticsAPI
+    @EnvironmentObject private var toastCenter: ToastCenter
     @Environment(\.globalLoading) private var globalLoading
     @Environment(\.horizontalSizeClass) private var horizontalSizeClass
 
-    @State private var viewModel = StatisticsViewModel()
+    @StateObject private var viewModel = StatisticsViewModel()
 
     private var currentScenicId: Int? {
         accountContext.currentScenic?.id
@@ -33,7 +33,7 @@ struct StatisticsView: View {
     var body: some View {
         Group {
             if currentScenicId == nil {
-                ContentUnavailableView(
+                AppContentUnavailableView(
                     "缺少经营上下文",
                     systemImage: "chart.bar.doc.horizontal",
                     description: Text("请先在首页选择景区后查看数据看板。")
@@ -59,10 +59,10 @@ struct StatisticsView: View {
         .navigationTitle("数据")
         .navigationBarTitleDisplayMode(.inline)
         .task { await reload() }
-        .onChange(of: accountContext.currentScenic?.id) { _, _ in
+        .onChange(of: accountContext.currentScenic?.id) { _ in
             Task { await reload() }
         }
-        .onChange(of: permissionContext.currentRole?.id) { _, _ in
+        .onChange(of: permissionContext.currentRole?.id) { _ in
             Task { await reload() }
         }
     }
@@ -171,7 +171,7 @@ struct StatisticsView: View {
                     .frame(maxWidth: .infinity)
                     .frame(minHeight: 280)
             } else if viewModel.dailyItems.isEmpty {
-                ContentUnavailableView("暂无数据", systemImage: "tray", description: Text("可切换时间范围或下拉刷新。"))
+                AppContentUnavailableView("暂无数据", systemImage: "tray", description: Text("可切换时间范围或下拉刷新。"))
                     .frame(minHeight: 280)
             } else {
                 VStack(spacing: 0) {
@@ -318,9 +318,9 @@ struct StatisticsView: View {
 #Preview {
     NavigationStack {
         StatisticsView()
-            .environment(AccountContext())
-            .environment(PermissionContext())
-            .environment(StatisticsAPI(client: APIClient()))
-            .environment(ToastCenter())
+            .environmentObject(AccountContext())
+            .environmentObject(PermissionContext())
+            .environment(\.statisticsAPI, StatisticsAPI(client: APIClient()))
+            .environmentObject(ToastCenter())
     }
 }