Fix fs.dirs api on iOS

These constants were never actually implemented.

ios/RNFetchBlob/RNFetchBlob.m

 - (NSDictionary *)constantsToExport
 {
     return @{
-             @"MainBundleDir" : [RNFetchBlobFS getMainBundleDir],
+             @"CacheDir" : [RNFetchBlobFS getCacheDir],
              @"DocumentDir": [RNFetchBlobFS getDocumentDir],
-             @"CacheDir" : [RNFetchBlobFS getCacheDir]
+             @"DownloadDir" : [RNFetchBlobFS getDownloadDir],
+             @"LibraryDir" : [RNFetchBlobFS getLibraryDir],
+             @"MainBundleDir" : [RNFetchBlobFS getMainBundleDir],
+             @"MovieDir" : [RNFetchBlobFS getMovieDir],
+             @"MusicDir" : [RNFetchBlobFS getMusicDir],
+             @"PictureDir" : [RNFetchBlobFS getPictureDir],
              };
 }
 

ios/RNFetchBlobFS.h

 @property (nonatomic) BOOL appendData;
 
 // get dirs
-+ (NSString *) getMainBundleDir;
-+ (NSString *) getTempPath;
 + (NSString *) getCacheDir;
 + (NSString *) getDocumentDir;
++ (NSString *) getDownloadDir;
++ (NSString *) getLibraryDir;
++ (NSString *) getMainBundleDir;
++ (NSString *) getMovieDir;
++ (NSString *) getMusicDir;
++ (NSString *) getPictureDir;
++ (NSString *) getTempPath;
 + (NSString *) getTempPath:(NSString*)taskId withExtension:(NSString *)ext;
 + (NSString *) getPathOfAsset:(NSString *)assetURI;
 + (NSString *) getPathForAppGroup:(NSString *)groupName;

ios/RNFetchBlobFS.m

     return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
 }
 
++ (NSString *) getDownloadDir {
+    return [NSSearchPathForDirectoriesInDomains(NSDownloadsDirectory, NSUserDomainMask, YES) firstObject];
+}
+
++ (NSString *) getLibraryDir {
+    return [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
+}
+
 + (NSString *) getMusicDir {
     return [NSSearchPathForDirectoriesInDomains(NSMusicDirectory, NSUserDomainMask, YES) firstObject];
 }