点击tab按钮时，刷新当前页面

Bark/AppDelegate.swift

@@ -55,6 +55,12 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterD
         }
         let tabBarController = StateStorageTabBarController()
         tabBarController.tabBar.tintColor = UIColor.black
+        
+        self.window?.backgroundColor = Color.grey.lighten5
+        self.window?.rootViewController = BarkSnackbarController(
+            rootViewController: tabBarController
+        )
+        
         tabBarController.viewControllers = [
             BarkNavigationController(rootViewController:HomeViewController(viewModel: HomeViewModel())),
             BarkNavigationController(rootViewController:MessageListViewController(viewModel: MessageListViewModel())),
@@ -68,10 +74,6 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterD
             viewController.tabBarItem = tabBarItems[index]
         }
         
-        self.window?.backgroundColor = Color.grey.lighten5
-        self.window?.rootViewController = BarkSnackbarController(
-            rootViewController: tabBarController
-        )
         self.window?.makeKeyAndVisible()
 
         UNUserNotificationCenter.current().delegate = self

Bark/en.lproj/Localizable.strings

@@ -48,7 +48,7 @@ copyParameter = "If the URL has a copy parameter then the value of the copy \npa
 automaticallyCopyTitle = "Automatically copy push content (No longer available after iOS14.5)";
 automaticallyCopy = "Automatically copy push content \nwhen a push is received";
 
-historyMessage = "History Message";
+historyMessage = "Message History";
 
 unknown = "Unknown";
 available = "Available";

Common/Client.swift

@@ -23,6 +23,12 @@ class Client: NSObject {
             return nav
         }
     }
+    var currentTabBarController:StateStorageTabBarController? {
+        get {
+            let controller = UIApplication.shared.delegate?.window??.rootViewController as? BarkSnackbarController
+            return controller?.rootViewController as? StateStorageTabBarController
+        }
+    }
     
     let appVersion:String = {
         var version = "0.0.0"

Controller/BarkNavigationController.swift

@@ -8,6 +8,8 @@
 
 import UIKit
 import Material
+import RxSwift
+
 class BarkNavigationController: UINavigationController{
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -21,19 +23,48 @@ class BarkSnackbarController: SnackbarController {
     }
 }
 
-class StateStorageTabBarController: UITabBarController, UITabBarControllerDelegate {
+enum TabPage: Int {
+    case unknown = -1
+    case service = 0
+    case messageHistory = 1
+    case settings = 2
+}
 
+class StateStorageTabBarController: UITabBarController, UITabBarControllerDelegate {
+    
+    // 标记当前显示的页面，再次点击相同的页面时当做页面点击事件。
+    var currentSelectedIndex: Int = 0
+    
+    // 点击当前页面的 tabBarItem ， 可以用以点击刷新当前页面等操作
+    lazy var tabBarItemDidClick: Observable<TabPage> = {
+        return self.rx.didSelect
+            .flatMapLatest { _ -> Single<TabPage> in
+                let single = Single<TabPage>.create { single in
+                    if self.currentSelectedIndex == self.selectedIndex {
+                        single(.success(TabPage(rawValue: self.selectedIndex) ?? .unknown))
+                    }
+                    self.currentSelectedIndex = self.selectedIndex
+                    return Disposables.create()
+                }
+                return single
+            }
+    }()
+
+    var isFirstAppear = true
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
-        if self.delegate == nil {
+        if isFirstAppear {
+            isFirstAppear = false
+            
+            //开启APP时，默认选择上次打开的页面
             if let index:Int = Settings[.selectedViewControllerIndex] {
                 self.selectedIndex = index
             }
-            self.delegate = self
+            //保存打开的页面Index
+            self.rx.didSelect.subscribe(onNext: {_ in
+                Settings[.selectedViewControllerIndex] = self.selectedIndex
+            }).disposed(by: rx.disposeBag)
         }
-    }
+
-    
-    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
-        Settings[.selectedViewControllerIndex] = self.selectedIndex
     }
 }

Controller/HomeViewController.swift

@@ -55,6 +55,13 @@ class HomeViewController: BaseViewController {
             make.top.equalTo(150)
         }
         
+        Client.shared.currentTabBarController?
+            .tabBarItemDidClick
+            .filter{ $0 == .service }
+            .subscribe(onNext: {[weak self] index in
+                self?.tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: .top, animated: true)
+            }).disposed(by: self.rx.disposeBag)
+        
     }
     override func bindViewModel() {
         guard let viewModel = self.viewModel as? HomeViewModel else {