added files via upload

Tweaks/FLEX/ViewHierarchy/FLEXImagePreviewViewController.h

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+//
+//  FLEXImagePreviewViewController.h
+//  Flipboard
+//
+//  Created by Ryan Olson on 6/12/14.
+//  Copyright (c) 2020 FLEX Team. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface FLEXImagePreviewViewController : UIViewController
+
++ (instancetype)previewForView:(UIView *)view;
++ (instancetype)previewForLayer:(CALayer *)layer;
++ (instancetype)forImage:(UIImage *)image;
+
+@end