Update MediaClient

MediaClient/MediaClientForMobile/ios/file_view_controller.mm

@@ -0,0 +1,20 @@
+#import "file_view_controller.h"
+@interface DocViewController ()
+@end
+@implementation DocViewController
+#pragma mark -
+#pragma mark View Life Cycle
+- (void)viewDidLoad {
+    [super viewDidLoad];
+}
+#pragma mark -
+#pragma mark Document Interaction Controller Delegate Methods
+- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
+    //return [[[[UIApplication sharedApplication]windows] firstObject]rootViewController];
+    return self;
+}
+- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller
+{
+    [self removeFromParentViewController];
+}
+@end