eagleoflqj · Nov 7, 2026 · Nov 7, 2026
diff --git a/assets/Localizable.xcstrings b/assets/Localizable.xcstrings
@@ -721,6 +721,22 @@
         }
       }
     },
+    "Couldn’t Shut Down Simulator": {
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "Couldn’t Shut Down Simulator"
+          }
+        },
+        "zh-Hans": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "无法关闭模拟器"
+          }
+        }
+      }
+    },
     "Couldn’t Start Simulator": {
       "localizations": {
         "en": {
@@ -769,6 +785,22 @@
         }
       }
     },
+    "Couldn’t shut down %@.\n%@": {
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "Couldn’t shut down %1$@.\n%2$@"
+          }
+        },
+        "zh-Hans": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "无法关闭 %1$@。\n%2$@"
+          }
+        }
+      }
+    },
     "Couldn’t start %@.\n%@": {
       "localizations": {
         "en": {
@@ -961,6 +993,22 @@
         }
       }
     },
+    "Finish or cancel app operations before shutting down this simulator.": {
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "Finish or cancel app operations before shutting down this simulator."
+          }
+        },
+        "zh-Hans": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "请先完成或取消应用操作，再关闭此模拟器。"
+          }
+        }
+      }
+    },
     "Games": {
       "localizations": {
         "en": {
@@ -1809,6 +1857,22 @@
         }
       }
     },
+    "Shut Down": {
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "Shut Down"
+          }
+        },
+        "zh-Hans": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "关机"
+          }
+        }
+      }
+    },
     "Shutdown": {
       "localizations": {
         "en": {
@@ -1841,6 +1905,22 @@
         }
       }
     },
+    "Shutting Down…": {
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "Shutting Down…"
+          }
+        },
+        "zh-Hans": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "正在关机…"
+          }
+        }
+      }
+    },
     "SimStore Is Up to Date": {
       "localizations": {
         "en": {

diff --git a/src/AppInstallationStore.swift b/src/AppInstallationStore.swift
@@ -48,6 +48,11 @@ final class AppInstallationStore {
     errors[Key(appID: appID, deviceID: deviceID)]
   }
 
+  func hasOperations(deviceID: String) -> Bool {
+    phases.keys.contains { $0.deviceID == deviceID }
+      || updateBatches[deviceID]?.isRunning == true
+  }
+
   func install(app: CatalogApp, version: CatalogVersion, on device: SimulatorDevice) {
     startInstallation(app: app, version: version, on: device, completion: didInstall)
   }

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
@@ -12,6 +12,7 @@ add_executable(SimStore MACOSX_BUNDLE
     SimulatorStore.swift
     SimulatorDevicePresentation.swift
     SimulatorSelectionViews.swift
+    SimulatorPowerButton.swift
     ContentView.swift
     LibrarySection.swift
     AppCatalog.swift

diff --git a/src/CatalogBrowserView.swift b/src/CatalogBrowserView.swift
@@ -7,9 +7,9 @@ struct CatalogBrowserView: View {
   let installedApps: InstalledAppsStore
   let installations: AppInstallationStore
   let device: SimulatorDevice
-  let isStarting: Bool
   let deviceManagerName: String?
   let startSimulator: () -> Void
+  let shutdownSimulator: () -> Void
   let openDeviceManager: () -> Void
 
   @State private var query = ""
@@ -115,8 +115,9 @@ struct CatalogBrowserView: View {
     }
     .popover(isPresented: $showsSimulator) {
       SimulatorDetailView(
-        device: device, isStarting: isStarting, deviceManagerName: deviceManagerName,
-        start: startSimulator, openDeviceManager: openDeviceManager
+        device: device, hasAppOperations: installations.hasOperations(deviceID: device.id),
+        deviceManagerName: deviceManagerName,
+        start: startSimulator, shutdown: shutdownSimulator, openDeviceManager: openDeviceManager
       )
       .frame(width: 480)
     }
@@ -144,14 +145,15 @@ struct CatalogBrowserView: View {
         .accessibilityHidden(true)
       VStack(alignment: .leading, spacing: 3) {
         Text(verbatim: device.name).fontWeight(.medium)
-        Text(verbatim: "\(device.runtimeLabel) · \(device.stateLabel(isStarting: isStarting))")
+        Text(verbatim: "\(device.runtimeLabel) · \(device.stateLabel())")
           .font(.system(size: 11)).foregroundStyle(.secondary)
       }
       .lineLimit(1)
       Spacer(minLength: 12)
-      if device.canStart || isStarting {
-        SimulatorStartButton(
-          isStarting: isStarting || device.state == "Booting", action: startSimulator)
+      if device.canStart || device.canShutdown || device.isTransitioning {
+        SimulatorPowerButton(
+          device: device, hasAppOperations: installations.hasOperations(deviceID: device.id),
+          start: startSimulator, shutdown: shutdownSimulator)
       }
       Button {
         showsSimulator = true

diff --git a/src/ContentView.swift b/src/ContentView.swift
@@ -21,6 +21,9 @@ struct ContentView: View {
     boot: @escaping @Sendable (String) async throws -> Void = {
       try await SimulatorControl.boot($0)
     },
+    shutdown: @escaping @Sendable (String) async throws -> Void = {
+      try await SimulatorControl.shutdown($0)
+    },
     catalogClient: CatalogClient = .live,
     installer: AppInstaller = AppInstaller(),
     showDevice: (@MainActor (SimulatorDevice) async throws -> Void)? = nil,
@@ -40,15 +43,17 @@ struct ContentView: View {
       }
       var installer = installer
       var boot = boot
+      var shutdown = shutdown
       var loadInstalledApps = loadInstalledApps
       if case .success(.some(.incompatible)) = preview {
         installer.download = { _, _, _ in try PreviewScenario.rejectDeviceAction() }
         installer.command = { _, _ in try PreviewScenario.rejectDeviceAction() }
         boot = { _ in try PreviewScenario.rejectDeviceAction() }
+        shutdown = { _ in try PreviewScenario.rejectDeviceAction() }
         loadInstalledApps = { _ in [] }
       }
     #endif
-    let simulators = SimulatorStore(discover: discover, boot: boot)
+    let simulators = SimulatorStore(discover: discover, shutdown: shutdown, boot: boot)
     _simulators = State(initialValue: simulators)
     _catalog = State(initialValue: CatalogStore(client: catalogClient))
     let installedApps = InstalledAppsStore(load: loadInstalledApps)
@@ -103,7 +108,7 @@ struct ContentView: View {
           discovery: discovery, isChecking: simulators.isChecking, needsXcode: needsXcode,
           section: $librarySection, updateCount: updateCount,
           selectedDeviceID: simulators.selectedDeviceID,
-          startingDeviceIDs: simulators.startingDeviceIDs, selectDevice: simulators.selectDevice,
+          selectDevice: simulators.selectDevice,
           openRepository: openRepository
         )
         .frame(width: geometry.size.width, height: geometry.size.height, alignment: .topLeading)
@@ -181,6 +186,17 @@ struct ContentView: View {
     } message: {
       Text(simulators.startError ?? "")
     }
+    .alert(
+      "Couldn’t Shut Down Simulator",
+      isPresented: Binding(
+        get: { simulators.shutdownError != nil },
+        set: { if !$0 { simulators.shutdownError = nil } }
+      )
+    ) {
+      Button("OK", role: .cancel) { simulators.shutdownError = nil }
+    } message: {
+      Text(simulators.shutdownError ?? "")
+    }
   }
 
   @ViewBuilder
@@ -198,9 +214,9 @@ struct ContentView: View {
           section: librarySection,
           store: catalog, installedApps: installedApps, installations: installations,
           device: device,
-          isStarting: simulators.isStartingSelectedDevice,
           deviceManagerName: deviceManager?.name,
           startSimulator: startSimulator,
+          shutdownSimulator: shutdownSimulator,
           openDeviceManager: openDeviceManager
         )
         .id(librarySection)
@@ -223,17 +239,25 @@ struct ContentView: View {
   }
 
   private func startSimulator() {
-    let id = simulators.selectedDeviceID
+    guard let id = simulators.selectedDeviceID else { return }
     Task {
-      let started = await simulators.startSelectedDevice()
+      let started = await simulators.startDevice(id)
       if started, let device = simulators.selectedDevice, device.id == id {
         openDeviceManager()
       }
     }
   }
 
+  private func shutdownSimulator() {
+    guard let id = simulators.selectedDeviceID, !installations.hasOperations(deviceID: id) else {
+      return
+    }
+    simulators.shutdownDevice(id)
+  }
+
   private var shouldMonitorState: Bool {
     !simulators.startingDeviceIDs.isEmpty
+      || !simulators.shuttingDownDeviceIDs.isEmpty
       || discovery?.devices.contains(where: \.isTransitioning) == true
   }
 

diff --git a/src/InstalledAppsStatusView.swift b/src/InstalledAppsStatusView.swift
@@ -8,7 +8,12 @@ struct InstalledAppsStatusView: View {
 
   var body: some View {
     Group {
-      if device.state != "Booted" {
+      if device.isTransitioning {
+        VStack(spacing: 14) {
+          ProgressView()
+          Text(verbatim: device.stateLabel()).foregroundStyle(.secondary)
+        }
+      } else if device.state != "Booted" {
         ContentUnavailableView {
           Label("Simulator Not Running", systemImage: "power")
         } description: {

diff --git a/src/SidebarView.swift b/src/SidebarView.swift
@@ -9,7 +9,6 @@ struct SidebarView: View {
   @Binding var section: LibrarySection
   let updateCount: Int?
   let selectedDeviceID: String?
-  let startingDeviceIDs: Set<String>
   let selectDevice: (String) -> Void
   let openRepository: () -> Void
 
@@ -53,7 +52,7 @@ struct SidebarView: View {
               VStack(alignment: .leading, spacing: 4) {
                 Text(device.name).font(.system(size: 12, weight: .medium))
                 Text(
-                  "\(device.runtimeLabel) · \(device.stateLabel(isStarting: startingDeviceIDs.contains(device.id)))"
+                  "\(device.runtimeLabel) · \(device.stateLabel())"
                 )
                 .font(.system(size: 10))
                 .foregroundStyle(.secondary)

diff --git a/src/SimulatorControl.swift b/src/SimulatorControl.swift
@@ -11,4 +11,15 @@ enum SimulatorControl {
     }.value
     try Task.checkCancellation()
   }
+
+  static func shutdown(
+    _ deviceID: String,
+    command: @escaping Command.Runner = Command.run
+  ) async throws {
+    try Task.checkCancellation()
+    try await Task.detached(priority: .userInitiated) {
+      _ = try Command.simctl(["shutdown", deviceID], using: command)
+    }.value
+    try Task.checkCancellation()
+  }
 }
diff --git a/src/SimulatorDevicePresentation.swift b/src/SimulatorDevicePresentation.swift
@@ -19,8 +19,8 @@ extension SimulatorDevice {
 
   var runtimeLabel: String { String(localized: "iOS \(runtime)") }
 
-  func stateLabel(isStarting: Bool = false) -> String {
-    switch isStarting ? "Booting" : state {
+  func stateLabel() -> String {
+    switch state {
     case "Booted": String(localized: "Booted")
     case "Shutdown": String(localized: "Shutdown")
     case "Booting": String(localized: "Booting")

diff --git a/src/SimulatorDiscovery.swift b/src/SimulatorDiscovery.swift
@@ -14,6 +14,8 @@ struct SimulatorDevice: Identifiable, Equatable, Sendable {
 
   var canStart: Bool { state == "Shutdown" || state == "Booting" }
 
+  var canShutdown: Bool { state == "Booted" }
+
   var isTransitioning: Bool { state == "Booting" || state == "Shutting Down" }
 }
-Original file line number
+Diff line change
@@ Expand Up / @@ -14,6 +14,8 @@ struct SimulatorDevice: Identifiable, Equatable, Sendable { @@
       var canStart: Bool { state == "Shutdown" || state == "Booting" }
+      var canShutdown: Bool { state == "Booted" }
       var isTransitioning: Bool { state == "Booting" || state == "Shutting Down" }
     }
@@ Expand Down @@