在 applicationWillTerminate() 中找出应用程序在哪个视图上终止

Posted 2023-02-23

【中文标题】在 applicationWillTerminate() 中找出应用程序在哪个视图上终止

【英文标题】：Find out which view the application was terminated on in applicationWillTerminate()

【发布时间】：2021-08-06 22:00:52

【问题描述】：

假设我的应用中有多个屏幕：View1、View2 等。

如果用户在某个屏幕上，比如View3，并且应用程序由于用户退出应用程序等而终止，我知道applicationWillTerminate(_ application: UIApplication) 会被调用，但我怎么知道用户在哪个视图上在应用程序终止之前？

我需要一些这样的功能：

func applicationWillTerminate(_ application: UIApplication) 
        let viewUserIsOn = getViewUserWasOnWhenAppQuit() 
        
        switch viewUserIsOn
        case .view1:
            doThisIfOnView1()
        case .view2:
            doThisIfOnView2()
        default:
            doNothing()
        
    

【参考方案1】：

如果视图按顺序显示，您可以执行以下操作：

class Settings: ObservableObject 
    static let shared = Settings()

    @Published var viewType: ViewType!


enum ViewType 
    case view1, view2, view3

---

struct View1: View 
    @ObservedObject var settings = Settings.shared

    var body: some View 
        [...]
        .onAppear 
            settings.viewType = .view1
        
    


struct View2: View 
    @ObservedObject var settings = Settings.shared

    var body: some View 
        [...]
        .onAppear 
            settings.viewType = .view2
        
    


// same for View 3

---

func applicationWillTerminate(_ application: UIApplication) 
    switch Settings.shared.viewType 
        case .view1: // View 1 was displayed
        case .view2: // View 2 was displayed
        case .view3: // View 3 was displayed