Add a new toggle in the overrides to enable Slow Animations.

ControlRoom/Localizable.xcstrings

@@ -1826,6 +1826,16 @@
         }
       }
     },
+    "Show Slow Animations" : {
+      "localizations" : {
+        "ar" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "أظهر رسوم متحركة بطيئة"
+          }
+        }
+      }
+    },
     "Show system apps" : {
       "localizations" : {
         "ar" : {

ControlRoom/Simulator UI/ControlScreens/OverridesView.swift

@@ -25,6 +25,7 @@ struct OverridesView: View {
 
     @State private var enhanceTextLegibility = false
     @State private var showButtonShapes = false
+    @State private var showSlowAnimations = false
     @State private var showOnOffLabels = false
     @State private var reduceTransparency = false
     @State private var increaseContrast = false
@@ -95,6 +96,7 @@ struct OverridesView: View {
 
                     Toggle("Bold Text", isOn: $enhanceTextLegibility.onChange(setEnhanceTextLegibility))
                     Toggle("Button Shapes", isOn: $showButtonShapes.onChange(setShowButtonShapes))
+                    Toggle("Show Slow Animations", isOn: $showSlowAnimations.onChange(setSlowAnimations))
                     Toggle("On/Off Labels", isOn: $showOnOffLabels.onChange(setShowOnOffLabels))
                     Toggle("Reduce Transparency", isOn: $reduceTransparency.onChange(setReduceTransparency))
                     Toggle("Increase Contrast", isOn: $increaseContrast.onChange(setIncreaseContrast))
@@ -141,6 +143,18 @@ struct OverridesView: View {
         SimCtl.setContentSize(simulator.udid, contentSize: contentSize)
     }
 
+    func sendDarvinNotification(key: String, value: Bool) {
+        // Slow animations are toggled via a Darwin notification state inside the simulator:
+        // set the state with `notifyutil -s`, then post it with `-p` so running apps pick it up.
+        let name = "com.apple.UIKit." + key
+        _ = Process.execute("/usr/bin/xcrun", arguments: ["simctl", "spawn", simulator.id, "notifyutil", "-s", name, value ? "1" : "0"])
+        _ = Process.execute("/usr/bin/xcrun", arguments: ["simctl", "spawn", simulator.id, "notifyutil", "-p", name])
+    }
+
+    func setSlowAnimations() {
+        sendDarvinNotification(key: "SimulatorSlowMotionAnimationState", value: showSlowAnimations)
+    }
+
     // Updates the simulator's accessibility setting for a particular key.
     // Example call: xcrun simctl spawn booted defaults write com.apple.Accessibility EnhancedTextLegibilityEnabled -bool FALSE
     func updateAccessibility(key: String, value: Bool) {

README.md

@@ -29,6 +29,7 @@ Control Room is packed with features to help you develop apps more effectively,
 - Controlling status of WiFi, cellular service, and battery.
 - Opening the data folder for your app, or editing your `UserDefaults` entries.
 - Overriding dark or light mode, language, accessibility options, and Dynamic Type content size.
+- Activating slow animations in the simulator. This sadly does not work on a real device.
 - Picking a custom user location from anywhere in the world.
 - Starting, stopping, installing, and removing apps.
 - Sending test push notifications or triggering deep links.