Tuesday, February 15, 2011


One things that's been tripping me up a bit when writing code that's supposed to be portable between iOS and Cocoa is the removal of NSPoint, NSSize, NSRect and their associated functions from Foundation in iOS. This is a real shame, because otherwise the Foundations are highly compatible.

One way to rectify this situation would be to start using CG* structs and functions on the desktop as well. However, this introduces a dependency on CoreGraphics that shouldn't be there for Foundation-based code.

My alternative is to standardize on NSPoint and friends, and map those to their CG alternatives on iOS. That way, I have minimized my dependencies, with only a small header file to pay for it: PhoneGeomtry.h

This is now part of MPWFoundation (on github).

//  PhoneGeometry.h
//  MPWFoundation
//  Created by Marcel Weiher on 11/11/10.
//  Copyright 2010-2011 Marcel Weiher. All rights reserved.

#import <CoreGraphics/CoreGraphics.h>
typedef CGRect NSRect;
typedef CGPoint NSPoint;
typedef CGSize NSSize;
#define NSMakeRect  CGRectMake
#define NSMakePoint CGPointMake
#define NSMakeSize  CGSizeMake
#define NSEqualPoints  CGPointEqualToPoint
#define NSEqualRects   CGRectEqualToRect
#define NSIntersectsRect  CGRectIntersectsRect
static inline NSString *NSStringFromRect( CGRect r ) { return [NSString stringWithFormat:@"(%g,%g - %g,%g)",r.origin.x,r.origin.y,r.size.width,r.size.height]; }
static inline NSString *NSStringFromPoint( CGPoint p ) { return [NSString stringWithFormat:@"(%g,%g)",p.x,p.y]; }
static inline NSString *NSStringFromSize( CGSize s ) { return [NSString stringWithFormat:@"(%g,%g)",s.width,s.height]; }


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