From 5683932862ab870e735342342c68e03fb5ca9e09 Mon Sep 17 00:00:00 2001
From: Tim Yung <yungsters@fb.com>
Date: Thu, 16 Sep 2021 23:13:05 -0700
Subject: [PATCH] RN: Fix NSInvalidArgumentException for Invalid Font Family
 Name

Summary:
We observed that in certain production scenarios, `[UIFont fontNamesForFamilyName:familyName]` returns `nil`.

This is problematic because we cannot insert `nil` (which is not an object type) into `NSCache`. Currently, this is causing `NSInvalidArgumentException` to be thrown.

This fix works around the problem by guarding against `nil`.

Changelog:
[iOS][Fixed] - Fix NSInvalidArgumentException for invalid font family names.

Reviewed By: fkgozali

Differential Revision: D31011394

fbshipit-source-id: a9eb9ce69efd832acca65787c665fcbb7b42a795
---
 React/Views/RCTFont.mm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/React/Views/RCTFont.mm b/React/Views/RCTFont.mm
index 7a8cbbb19abe01..549adca51b192e 100644
--- a/React/Views/RCTFont.mm
+++ b/React/Views/RCTFont.mm
@@ -172,7 +172,7 @@ struct __attribute__((__packed__)) CacheKey {
 
   auto names = [cache objectForKey:familyName];
   if (!names) {
-    names = [UIFont fontNamesForFamilyName:familyName];
+    names = [UIFont fontNamesForFamilyName:familyName] ?: [NSArray new];
     [cache setObject:names forKey:familyName];
   }
   return names;