Fix Deadlock in RCTi18nUtil (iOS)

React/Modules/RCTI18nUtil.h

@@ -18,11 +18,21 @@
 + (instancetype)sharedInstance;
 
 - (BOOL)isRTL;
-- (BOOL)isRTLAllowed;
-- (void)allowRTL:(BOOL)value;
-- (BOOL)isRTLForced;
-- (void)forceRTL:(BOOL)value;
-- (BOOL)doLeftAndRightSwapInRTL;
-- (void)swapLeftAndRightInRTL:(BOOL)value;
+
+/**
+ * Should be used very early during app start up
+ * Before the bridge is initialized
+ */
+@property(atomic, setter=allowRTL:) BOOL isRTLAllowed;
+
+/**
+ * Could be used to test RTL layout with English
+ * Used for development and testing purpose
+ */
+@property(atomic, setter=forceRTL:) BOOL isRTLForced;
+
+@property(atomic, setter=swapLeftAndRightInRTL:) BOOL doLeftAndRightSwapInRTL;
+
+
 
 @end

React/Modules/RCTI18nUtil.m

@@ -18,6 +18,7 @@ + (instancetype)sharedInstance
   dispatch_once(&onceToken, ^{
     sharedInstance = [self new];
     [sharedInstance swapLeftAndRightInRTL:true];
+    [sharedInstance allowRTL:true];
   });
 
   return sharedInstance;
@@ -40,53 +41,6 @@ - (BOOL)isRTL
   return NO;
 }
 
-/**
- * Should be used very early during app start up
- * Before the bridge is initialized
- * @return whether the app allows RTL layout, default is true
- */
-- (BOOL)isRTLAllowed
-{
-  NSNumber *value = [[NSUserDefaults standardUserDefaults] objectForKey:@"RCTI18nUtil_allowRTL"];
-  if (value == nil) {
-    return YES;
-  }
-  return [value boolValue];
-}
-
-- (void)allowRTL:(BOOL)rtlStatus
-{
-  [[NSUserDefaults standardUserDefaults] setBool:rtlStatus forKey:@"RCTI18nUtil_allowRTL"];
-  [[NSUserDefaults standardUserDefaults] synchronize];
-}
-
-/**
- * Could be used to test RTL layout with English
- * Used for development and testing purpose
- */
-- (BOOL)isRTLForced
-{
-  BOOL rtlStatus = [[NSUserDefaults standardUserDefaults] boolForKey:@"RCTI18nUtil_forceRTL"];
-  return rtlStatus;
-}
-
-- (void)forceRTL:(BOOL)rtlStatus
-{
-  [[NSUserDefaults standardUserDefaults] setBool:rtlStatus forKey:@"RCTI18nUtil_forceRTL"];
-  [[NSUserDefaults standardUserDefaults] synchronize];
-}
-
-- (BOOL)doLeftAndRightSwapInRTL
-{
-  return [[NSUserDefaults standardUserDefaults] boolForKey:@"RCTI18nUtil_makeRTLFlipLeftAndRightStyles"];
-}
-
-- (void)swapLeftAndRightInRTL:(BOOL)value
-{
-  [[NSUserDefaults standardUserDefaults] setBool:value forKey:@"RCTI18nUtil_makeRTLFlipLeftAndRightStyles"];
-  [[NSUserDefaults standardUserDefaults] synchronize];
-}
-
 // Check if the current device language is RTL
 - (BOOL)isDevicePreferredLanguageRTL
 {