merge

src/ios/RNFetchBlob/RNFetchBlob.m

     [RNFetchBlobFS slice:src dest:dest start:start end:end encode:@"" resolver:resolve rejecter:reject];
 })
 
+RCT_EXPORT_METHOD(openFile:(NSString*)uri {
+    [[[RNFetchBlobFS alloc ] init ]openFile:uri];
+})
+
 #pragma mark RNFetchBlob private methods
 
 

src/ios/RNFetchBlobFS.h

 
 #import <Foundation/Foundation.h>
 #import "RCTBridgeModule.h"
+#import <UIKit/UIKit.h>
 @import AssetsLibrary;
 
-@interface RNFetchBlobFS : NSObject <NSStreamDelegate>  {
+@interface RNFetchBlobFS : NSObject <NSStreamDelegate, UIDocumentInteractionControllerDelegate>  {
     NSOutputStream * outStream;
     NSInputStream * inStream;
     RCTResponseSenderBlock callback;
 - (void) closeInStream;
 - (void) closeOutStream;
 
+- (void) openFile:( NSString * _Nonnull ) uri;
+
 @end
 
 #endif /* RNFetchBlobFS_h */

src/ios/RNFetchBlobFS.m

     }
 }
 
+# pragma mark - open file with UIDocumentInteractionController and delegate
+
+- (void) openFile:(NSString *) uri
+{
+    NSURL * url = [[NSURL alloc] initWithString:uri];
+    UIDocumentInteractionController * docCtrl = [UIDocumentInteractionController interactionControllerWithURL:url];
+    docCtrl.delegate = self;
+    [docCtrl presentPreviewAnimated:YES];
+    
+}
+
+- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
+    return self;
+}
+
 @end

test/test-init.js

 // require('./test-0.9.0')
 // require('./test-0.9.2')
 require('./test-0.10.0')
+// require('./test-0.9.4')
 // require('./test-fetch')
 // require('./test-fs')
 // require('./test-xmlhttp')