Add asynchronous API for loading current config.

Author: nlutsenko

Parse/PFConfig.h

@@ -38,6 +38,15 @@ typedef void(^PFConfigResultBlock)(PFConfig *_Nullable config, NSError *_Nullabl
  */
 + (PFConfig *)currentConfig;
 
+/**
+ Returns the task that encapsulates the most recently fetched config.
+
+ If there was no config fetched - this method will return an empty instance of `PFConfig`.
+
+ @return Task that encapsulates current, last fetched instance of PFConfig.
+ */
++ (BFTask<__kindof PFConfig *> *)getCurrentConfigInBackground;
+
 ///--------------------------------------
 #pragma mark - Retrieving Config
 ///--------------------------------------

Parse/PFConfig.m

@@ -40,8 +40,11 @@ + (PFConfigController *)_configController {
 #pragma mark Public
 
 + (PFConfig *)currentConfig {
- return [[[self _configController].currentConfigController getCurrentConfigAsync] waitForResult:nil
- withMainThreadWarning:NO];
+ return [[self getCurrentConfigInBackground] waitForResult:nil withMainThreadWarning:NO];
+}
+
++ (BFTask<__kindof PFConfig *> *)getCurrentConfigInBackground {
+ return [[self _configController].currentConfigController getCurrentConfigAsync];
 }
 
 ///--------------------------------------