Add Success and Failure Callbacks to setLanguage

* Add success and failure callbacks to OneSignal.setLanguage
* Add success and failure callbacks to OSStateSynchronizer.UpdateLanguage

Author: tanaynigam

iOS_SDK/OneSignalSDK/Source/OSStateSynchronizer.h

@@ -77,6 +77,8 @@ withSMSAuthHashToken:(NSString * _Nullable)hashToken
               onFailure:(OSMultipleFailureBlock _Nullable)failureBlock;
 
 - (void)updateLanguage:(NSString * _Nonnull)language
-                 appId:(NSString * _Nonnull)appId;
+                 appId:(NSString * _Nonnull)appId
+           withSuccess:(OSUpdateLanguageSuccessBlock)successBlock
+           withFailure:(OSUpdateLanguageFailureBlock)failureBlock;
 
 @end

iOS_SDK/OneSignalSDK/Source/OSStateSynchronizer.m

@@ -382,14 +382,29 @@ - (void)callSMSSuccessBlockOnMainThread:(OSSMSSuccessBlock)successBlock withSMSN
 }
 
 - (void)updateLanguage:(NSString * _Nonnull)language
-                 appId:(NSString * _Nonnull)appId {
+                 appId:(NSString * _Nonnull)appId
+           withSuccess:(OSUpdateLanguageSuccessBlock)successBlock
+           withFailure:(OSUpdateLanguageFailureBlock)failureBlock {
     let stateSyncronizer = [self getStateSynchronizers];
     let requests = [NSMutableDictionary new];
     for (OSUserStateSynchronizer* userStateSynchronizer in stateSyncronizer) {
         requests[userStateSynchronizer.getChannelId] = [userStateSynchronizer setLanguage:language withAppId:appId];
     }
 
-    [OneSignalClient.sharedClient executeSimultaneousRequests:requests withSuccess:nil onFailure:nil];
+    [OneSignalClient.sharedClient executeSimultaneousRequests:requests withCompletion:^(NSDictionary<NSString *,NSDictionary *> *results) {
+        if (results[OS_PUSH] && results[OS_PUSH][OS_SUCCESS] && [results[OS_PUSH][OS_SUCCESS] boolValue]) {
+            [OneSignalUserDefaults.initStandard saveStringForKey:OSUD_LANGUAGE withValue:language];
+        }
+        else if (results[OS_EMAIL] && results[OS_EMAIL][OS_SUCCESS] && [results[OS_EMAIL][OS_SUCCESS] boolValue]) {
+            [OneSignalUserDefaults.initStandard saveStringForKey:OSUD_LANGUAGE withValue:language];
+        }
+        else if (results[OS_SMS] && results[OS_SMS][OS_SUCCESS] && [results[OS_SMS][OS_SUCCESS] boolValue]) {
+            [OneSignalUserDefaults.initStandard saveStringForKey:OSUD_LANGUAGE withValue:language];
+        }
+        
+        if (successBlock)
+            successBlock(results);
+    }];
 }
 
 @end

iOS_SDK/OneSignalSDK/Source/OneSignal.h

@@ -564,8 +564,12 @@ typedef void (^OSSMSSuccessBlock)(NSDictionary *results);
 + (void)logoutSMSNumberWithSuccess:(OSSMSSuccessBlock _Nullable)successBlock withFailure:(OSSMSFailureBlock _Nullable)failureBlock;
 
 #pragma mark Language
+// Typedefs defining completion blocks for updating language
+typedef void (^OSUpdateLanguageFailureBlock)(NSError *error);
+typedef void (^OSUpdateLanguageSuccessBlock)(NSDictionary *results);
 
 + (void)setLanguage:(NSString * _Nonnull)language;
++ (void)setLanguage:(NSString * _Nonnull)language withSuccess:(OSUpdateLanguageSuccessBlock _Nullable)successBlock withFailure:(OSUpdateLanguageFailureBlock)failureBlock;
 
 #pragma mark External User Id
 // Typedefs defining completion blocks for updating the external user id

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -90,8 +90,8 @@
 #import "OneSignalLifecycleObserver.h"
 #import "OSPlayerTags.h"
 
-#import "Language/LanguageProviderAppDefined.h"
-#import "Language/LanguageContext.h"
+#import "LanguageProviderAppDefined.h"
+#import "LanguageContext.h"
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wundeclared-selector"
@@ -2705,26 +2705,30 @@ + (void)setLanguage:(NSString * _Nonnull)language {
     if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:@"setLanguage"])
         return;
 
-    let languageProviderAppDefined = [LanguageProviderAppDefined new];
-    [languageProviderAppDefined setLanguage:language];
-    [languageContext setStrategy:languageProviderAppDefined];
-    
     //Can't send Language if there exists not LanguageContext or language
     if (languageContext.language)
-        [self setLanguageOnServer];
+        [self setLanguageOnServer:language WithSuccess:nil withFailure:nil];
 }
 
-// Called only with a delay to batch network calls.
-+ (void)setLanguageOnServer {
-    
++ (void)setLanguage:(NSString * _Nonnull)language withSuccess:(OSUpdateLanguageSuccessBlock)successBlock withFailure:(OSUpdateLanguageFailureBlock)failureBlock {
     // return if the user has not granted privacy permissions
-    if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:nil])
+    if ([self shouldLogMissingPrivacyConsentErrorWithMethodName:@"setLanguage"])
         return;
 
-    if (!languageContext.language) //Add Language null check
-        return;
+    //Can't send Language if there exists not LanguageContext or language
+    if (languageContext.language)
+        [self setLanguageOnServer:language WithSuccess:successBlock withFailure:failureBlock];
+}
+
++ (void)setLanguageOnServer:(NSString * _Nonnull)language WithSuccess:(OSUpdateLanguageSuccessBlock)successBlock withFailure:(OSUpdateLanguageFailureBlock)failureBlock {
+    
+    [OneSignal.stateSynchronizer updateLanguage:language appId:appId withSuccess:successBlock withFailure:failureBlock];
 
-    [OneSignal.stateSynchronizer updateLanguage:languageContext.language appId:appId];
+    if(successBlock) {
+        let languageProviderAppDefined = [LanguageProviderAppDefined new];
+        [languageProviderAppDefined setLanguage:language];
+        [languageContext setStrategy:languageProviderAppDefined];
+    }
 }
 
 + (void)setExternalUserId:(NSString * _Nonnull)externalId {