192 lines
5.5 KiB
Markdown
192 lines
5.5 KiB
Markdown
# 启动优化方案
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## 🔍 发现的瓶颈
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### 1. **TabbarController 一次性创建 4 个 ViewController**
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```swift
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// 现在的做法 - 启动时全部创建
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let v1 = HomeViewController()
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let v2 = MarketViewController()
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let v3 = MessageViewController()
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let v4 = MineViewController()
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```
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**问题**：每个 ViewController 都会在 viewDidLoad 中：
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- 加载 UI
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- 初始化主题系统
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- 添加通知观察者
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- 可能加载网络数据
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### 2. **MktNavigationController 初始化开销**
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- 每个 NavigationController 都要：
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- 设置主题
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- 添加手势识别器
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- 配置导航栏外观
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### 3. **主题系统初始化**
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- ThemeManager 在每个 ViewController 中都要初始化
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- 每个 ViewController 都要添加通知观察者
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---
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## ✅ 优化方案
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### 方案 1：延迟加载 ViewController（推荐）
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```swift
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class TabbarController {
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static let shared = TabbarController()
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private init() {}
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private var viewControllers: [UIViewController?] = [nil, nil, nil, nil]
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func customBouncesStyle() -> ESTabBarController {
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let tabBarController = ESTabBarController()
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self.applyCurvedShadow(tabBarController.tabBar)
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// 只创建第一个 ViewController
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let v1 = HomeViewController()
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let nav1 = MktNavigatonController(rootViewController: v1)
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// 其他 ViewController 延迟创建
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let nav2 = UINavigationController()
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let nav3 = UINavigationController()
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let nav4 = UINavigationController()
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// 设置 TabBar 项
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v1.tabBarItem = ESTabBarItem(BouncesView(), title: "首页",
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image: UIImage(named: "tabbar_shouye_normal"),
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selectedImage: UIImage(named: "tabbar_shouye_select"))
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nav2.tabBarItem = ESTabBarItem(BouncesView(), title: "极速租",
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image: UIImage(named: "tabbar_fenlei_normal"),
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selectedImage: UIImage(named: "tabbar_fenlei_select"))
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nav3.tabBarItem = ESTabBarItem(BouncesView(), title: "客服",
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image: UIImage(named: "tabbar_kf_normal"),
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selectedImage: UIImage(named: "tabbar_kf_select"))
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nav4.tabBarItem = ESTabBarItem(BouncesView(), title: "我的",
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image: UIImage(named: "tabbar_mine_normal"),
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selectedImage: UIImage(named: "tabbar_mine_select"))
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tabBarController.viewControllers = [nav1, nav2, nav3, nav4]
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tabBarController.delegate = self
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self.viewControllers[0] = v1
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return tabBarController
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}
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// 当用户切换 TabBar 时才创建对应的 ViewController
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func tabBarController(_ tabBarController: UITabBarController,
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didSelect viewController: UIViewController) {
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guard let navController = viewController as? UINavigationController else { return }
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let index = tabBarController.selectedIndex
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// 如果已经创建过，直接返回
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if viewControllers[index] != nil {
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return
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}
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// 延迟创建
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let vc: UIViewController
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switch index {
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case 1:
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vc = MarketViewController()
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case 2:
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vc = MessageViewController()
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case 3:
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vc = MineViewController()
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default:
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return
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}
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navController.viewControllers = [vc]
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viewControllers[index] = vc
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}
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}
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extension TabbarController: UITabBarControllerDelegate {
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// 实现 delegate 方法
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}
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```
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### 方案 2：异步初始化主题
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在 AppDelegate 中延迟初始化主题：
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```swift
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func application(_ application: UIApplication,
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didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
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self.window = UIWindow(frame: UIScreen.main.bounds)
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self.window?.rootViewController = TabbarController.shared.customBouncesStyle()
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self.window?.makeKeyAndVisible()
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// 延迟初始化主题（不阻塞启动）
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
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_ = ThemeManager.shared
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}
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return true
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}
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```
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### 方案 3：优化 MktNavigationController
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移除不必要的初始化：
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```swift
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override func viewDidLoad() {
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super.viewDidLoad()
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self.view.backgroundColor = .white
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self.navigationBar.isHidden = self.isHidden
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// ... 其他代码 ...
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// 延迟设置主题（不阻塞启动）
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DispatchQueue.main.asyncAfter(deadline: .now() + 0.05) {
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self.setupTheme()
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(self.themeDidChange),
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name: NSNotification.Name("ThemeDidChangeNotification"),
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object: nil
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)
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}
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}
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```
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---
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## 📊 优化效果预期
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| 优化项 | 启动时间减少 |
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|------|----------|
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| 延迟加载 ViewController | 60-70% |
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| 异步初始化主题 | 10-15% |
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| 优化 NavigationController | 5-10% |
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| **总体** | **70-80%** |
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---
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## 🎯 推荐方案
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**使用方案 1（延迟加载）** 效果最好，因为：
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- ✅ 启动时只创建首页
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- ✅ 用户切换 TabBar 时才创建其他页面
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- ✅ 用户感知不到延迟
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- ✅ 内存占用更低
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---
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## 实施步骤
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1. 修改 TabbarController 实现延迟加载
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2. 添加 UITabBarControllerDelegate
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3. 在 didSelect 中创建对应的 ViewController
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4. 测试各个 TabBar 页面的切换
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这样启动速度会明显提升！
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