Xcode的未知类型名称

Question

我有这样的代码：

Match.h：

#import <Foundation/Foundation.h> 
#import "player.h" 

@interface Match : NSObject 
{ 
    Player *firstPlayer; 
} 

@property (nonatomic, retain) Player *firstPlayer; 

@end 

Player.h：

#import <Foundation/Foundation.h> 
#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 <Foundation/Foundation.h> 
#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不会编译我的项目并显示错误未知类型'播放器'在Match.h中声明* firstPlayer时。

我试图清理项目，重建它，但没有任何结果......

Answer 1

正常的方式来解决这个周期是转发声明类：

在Match.h：

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

和do #import "Player.h只在Match.m中，01​​在Match.h中

与其他两个.h文件相同。