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POObjective-C header file not recognizing custom object as a type
 

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    <p>I'm working on a game for iPad using cocos2d which involves a board filled with different types of tiles. I've created a custom class called <code>Tile</code> as a general template for tiles and a few subclasses of <code>Tile</code> which have different properties and methods. I've also created a class called <code>Board</code> which, among other things, keeps track of the locations of all the tiles using a special coordinate system. </p> <p>For some reason, in the <code>Board</code> class, the compiler doesn't seem to be recognizing <code>Tile</code> as a type of object, even though I've added <code>#import "Tile.h"</code> at the top of the file. </p> <p>Here's the relevant code (just ask if there's other parts of the code you want to see):</p> <p><strong>Tile.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "cocos2d.h" #import "Board.h" @interface Tile : NSObject -(void) updateNeighbors; @property (nonatomic, retain) CCSprite* sprite; @property (assign) CGPoint coords; @property (assign) CGPoint positionInPoints; @property (nonatomic, retain) NSMutableArray *neighbors; @end </code></pre> <p><strong>Board.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import "cocos2d.h" #import "Tile.h" @interface Board : NSObject +(Board*)sharedBoard; - (void) putTile: (Tile*) tile AtIndex: (CGPoint) index; //&lt;-- error here! - (void) replaceTileAtIndex: (CGPoint) index1 WithTileAtIndex: (CGPoint) index2; - (Tile*) tileAtIndex: (CGPoint) index; //&lt;-- error here! - (void) populate; @property (nonatomic, retain) NSMutableArray *tiles; @property (nonatomic, retain) NSString *type; @property (assign) CGPoint size; @end </code></pre> <p>This code will not even build and I'm getting the following error where indicated:</p> <blockquote> <p>Expected '(' before 'Tile'</p> </blockquote> <p>If I change the type from <code>(Tile*)</code> to <code>(NSObject*)</code>, it fixes the error, which leads me to believe that <code>Tile</code> is not being recognized as a type of object.</p> <p>I've searched via Google and this site and cannot figure out why this is happening.</p> <hr> <h2>Update</h2> <p>Dumb mistake; easy to fix. </p> <p>As you all have pointed out the problem is that the two header files are importing each other, which is not allowed. For now, I've fixed the problem by moving the #import "Board.h" statement to Tile.m, since it isn't needed in the header file. Later on, if I decide to use Board in the Tile.h file I will use forward referencing (@class Board;), as a few of you suggested.</p> <p>Thanks again!</p>
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    1. COHav you tried adding a forward declaration of Tile (aka `@class Tile;`) at the top of Board.h?
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