0028148: Samples - add 3D Viewer sample for iOS platform

Sample that uses UIKit has been added.
- Import of STEP files is provided
- Zoom, Rotate, Pan actions are provided
- Selection of solids is supported

samples/ios/UIKitSample/UIKitSample/GLView.h

@@ -0,0 +1,40 @@
+// Copyright (c) 2017 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef GLView_h
+#define GLView_h
+
+#import <UIKit/UIKit.h>
+#import <QuartzCore/QuartzCore.h>
+#include <OpenGLES/ES2/gl.h>
+#include <OpenGLES/ES2/glext.h>
+
+#import "GLViewController.h"
+
+//! Open GL view
+@interface GLView : UIView {
+  
+@public
+  GLViewController* myController;
+  
+  EAGLContext* myGLContext;
+  
+  int myBackingWidth;
+  int myBackingHeight;
+  GLuint myFrameBuffer;
+  GLuint myRenderBuffer;
+  GLuint myDepthBuffer;
+}
+
+@end
+#endif // GLView_h