Question

My code:

     NSArray *keys = [piecesDict allKeys]; 
    //keys are NSStrings of sprite names, piecesDict is NSDictionary

    for(int i = 0; i < piecesDict.count; i++){
        PuzzlePiece *piece;
        id key = [keys objectAtIndex:i];
        piece.keyName = key; }

The exact code that crashes is piece.keyName = key. I get EXC_BAD_ACCESS. The .keyName property is (nonatomic, retain). I have tried making key an NSString * or casting it with (NSString *)key to no avail.

What am I missing here?

Answer 1

You don’t initialize piece, you just declare a pointer and leave it hanging in the air. It will point to random crap and crash. You need to assign it to a proper instance:

PuzzlePiece *piece = [[PuzzlePiece alloc] init]; // or whatever

And seriously: do learn C well before attempting to make iOS apps or you will shoot yourself and your users in the foot.