From 51a5b60a1a4773e6db8798ff4b2eac02dc75c127 Mon Sep 17 00:00:00 2001
From: Ryan Olson <rolson@fb.com>
Date: Wed, 11 Nov 2015 09:27:16 -0800
Subject: [PATCH] Fix showing alerts when modals are presented

Reviewed By: nicklockwood

Differential Revision: D2638505

fb-gh-sync-id: ebecc82baa46be4302fc8d3231f859de572eda10
---
 React/Modules/RCTAlertManager.m | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/React/Modules/RCTAlertManager.m b/React/Modules/RCTAlertManager.m
index 7c6ef18f54..3da550c4f9 100644
--- a/React/Modules/RCTAlertManager.m
+++ b/React/Modules/RCTAlertManager.m
@@ -95,6 +95,12 @@ RCT_EXPORT_METHOD(alertWithArgs:(NSDictionary *)args
     return;
   }
 
+  // Walk the chain up to get the topmost modal view controller. If modals are presented,
+  // the root view controller's view might not be in the window hierarchy, and presenting from it will fail.
+  while (presentingController.presentedViewController) {
+    presentingController = presentingController.presentedViewController;
+  }
+
 #if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0
 
   if ([UIAlertController class] == nil) {