From 7b71d129f6b71e6a7978c934cda60f8190316674 Mon Sep 17 00:00:00 2001
From: Chris Leonavicius <chris.leonavicius@amplitude.com>
Date: Mon, 18 Nov 2024 12:51:07 -0800
Subject: [PATCH] fix: prevent main thread checker warning (#248)

---
 Sources/Amplitude/Plugins/iOS/IOSLifecycleMonitor.swift | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Sources/Amplitude/Plugins/iOS/IOSLifecycleMonitor.swift b/Sources/Amplitude/Plugins/iOS/IOSLifecycleMonitor.swift
index ced89eb..cef0e04 100644
--- a/Sources/Amplitude/Plugins/iOS/IOSLifecycleMonitor.swift
+++ b/Sources/Amplitude/Plugins/iOS/IOSLifecycleMonitor.swift
@@ -41,7 +41,12 @@ class IOSLifecycleMonitor: UtilityPlugin {
         utils = DefaultEventUtils(amplitude: amplitude)
 
         // If we are already in the foreground, dispatch installed / opened events now
-        if IOSVendorSystem.sharedApplication?.applicationState == .active {
+        // Use keypath vs applicationState property to avoid main thread checker warning,
+        // we want to dispatch this from the initiating thread to maintain event ordering.
+        if let application = IOSVendorSystem.sharedApplication,
+           let rawState = application.value(forKey: #keyPath(UIApplication.applicationState)) as? Int,
+           let applicationState = UIApplication.State(rawValue: rawState),
+           applicationState == .active {
             utils?.trackAppUpdatedInstalledEvent()
             amplitude.onEnterForeground(timestamp: currentTimestamp)
             utils?.trackAppOpenedEvent()