From bb30e5f8f0867cfb6053c75b61989564fed0af92 Mon Sep 17 00:00:00 2001
From: Biruk Dubale <64862608+callbiruk@users.noreply.github.com>
Date: Fri, 18 Dec 2020 08:16:46 -0500
Subject: [PATCH] The alert should be called in the main thread.

This fix resolves:
(NSException *) exception = 0x0000000280f86df0 name: "NSInternalInconsistencyException" - reason: "Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread."
---
 packages/local_auth/ios/Classes/FLTLocalAuthPlugin.m | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/packages/local_auth/ios/Classes/FLTLocalAuthPlugin.m b/packages/local_auth/ios/Classes/FLTLocalAuthPlugin.m
index aa0c217ef543..c5ec801aab0d 100644
--- a/packages/local_auth/ios/Classes/FLTLocalAuthPlugin.m
+++ b/packages/local_auth/ios/Classes/FLTLocalAuthPlugin.m
@@ -62,9 +62,15 @@ - (void)alertMessage:(NSString *)message
                 }];
     [alert addAction:additionalAction];
   }
-  [[UIApplication sharedApplication].delegate.window.rootViewController presentViewController:alert
-                                                                                     animated:YES
-                                                                                   completion:nil];
+
+  @try {
+      dispatch_async(dispatch_get_main_queue(), ^{
+          [[UIApplication sharedApplication].delegate.window.rootViewController presentViewController:alert  animated:YES  completion:nil];
+      });
+  } @catch (NSException *exception) {
+      NSLog(@"Exception presentViewController: %@", exception);
+  } @finally {
+  }
 }
 
 - (void)getAvailableBiometrics:(FlutterResult)result {