Default value of an Objective-C struct and how to test

Question

I\'m trying to test if a property has been set yet. I know that with objects that I\'ve got:

CGRect ppGoalFrame;
LocalPlaySetup *localPlaySetup;

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Answer 1

From CGGeometry.h:

/* Return true if `rect' is empty (that is, if it has zero width or height),
   false otherwise. A null rect is defined to be empty. */

an empty rectangle is one that has no area, where on or both sides are zero.
Use instead:

CGRect newRect = CGRectNull;