Merge pull request #600 from nadav2051/bugfix/ios-fix-create-file-base64

Bugfix/ios fix create file base64

Author: rpenfold

ios/RNFetchBlob/RNFetchBlob.m

@@ -165,7 +165,7 @@ - (NSDictionary *)constantsToExport
         fileContent = [[NSData alloc] initWithData:[data dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]];
     }
     else if([[encoding lowercaseString] isEqualToString:@"base64"]) {
-        fileContent = [[NSData alloc] initWithBase64EncodedData:data options:0];
+        fileContent = [[NSData alloc] initWithBase64EncodedData:data options:NSDataBase64DecodingIgnoreUnknownCharacters];
     }
     else if([[encoding lowercaseString] isEqualToString:@"uri"]) {
         NSString * orgPath = [data stringByReplacingOccurrencesOfString:FILE_PREFIX withString:@""];
@@ -639,7 +639,12 @@ - (NSDictionary *)constantsToExport
 - (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller
 {
     UIWindow *window = [UIApplication sharedApplication].keyWindow;
-    return window.rootViewController;
+    UIViewController *currentlyPresentedView = [window.rootViewController presentedViewController];
+    if (currentlyPresentedView == nil)
+    {
+        return window.rootViewController;
+    }
+    return currentlyPresentedView;
 }
 
 # pragma mark - check expired network events

polyfill/Fetch.js

@@ -41,6 +41,7 @@ class RNFetchBlobFetchPolyfill {
           promise = Blob.build(body).then((b) => {
             blobCache = b
             options.headers['Content-Type'] = 'multipart/form-data;boundary=' + b.multipartBoundary
+            options.headers['content-type'] = 'multipart/form-data;boundary=' + b.multipartBoundary
             return Promise.resolve(RNFetchBlob.wrap(b._ref))
           })
         }