xcode unknown type name

问题:

I got code like this:

Match.h:

#import  #import "player.h"  @interface Match : NSObject {     Player *firstPlayer; }  @property (nonatomic, retain) Player *firstPlayer;  @end 

Player.h:

#import  #import "game.h" @interface Player : NSObject { }  - (Player *) init;  //- (NSInteger)numberOfPoints; //- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;   @property (nonatomic, retain) NSString *name; @property (nonatomic, retain) NSString *surname; @property (nonatomic, assign) NSInteger *player_id; @property (nonatomic, retain) NSString *notes;  @end 

Game.h:

#import  #import "match.h" #import "player.h"  @interface Game : NSObject {     NSMutableArray *matches;     NSMutableArray *players;     NSString *name; }  -(Game *) init;  @property (nonatomic, retain) NSMutableArray *matches; @property (nonatomic, retain) NSMutableArray *players; @property (nonatomic, retain) NSString *name;  @end 

Xcode won't compile my project and show me error unknown type 'Player' in Match.h when I declare *firstPlayer.

I tried cleaning project, rebuilding it but without any result...

回答1:

The normal way to solve this cycles is to forward declare classes:

In Match.h:

@class Player; @interface Match ...     Player * firstPlayer; 

and do #import "Player.h only in Match.m, not in Match.h

Same for the other two .h files.

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