#if __UNIFIED__
...

// Mappings Unified CoreGraphic classes to MonoTouch classes
using RectangleF = global::CoreGraphics.CGRect;
using SizeF = global::CoreGraphics.CGSize;
using PointF = global::CoreGraphics.CGPoint;
#else
...

// Mappings Unified types to MonoTouch types
using nfloat = global::System.Single;
using nint = global::System.Int32;
using nuint = global::System.UInt32;
#endif