Objective-C ccKeyDown播放器移动

我目前正在Objective-C的Cocos2D Mac游戏中工作。Objective-C ccKeyDown播放器移动

我已经得到了移动工作，但我有一个问题..

我用这个代码将我的播放器，它是一只苍蝇所以它需要在各个方向自由移动。

键盘事件：

- (void)ccKeyDown:(NSEvent*)keyDownEvent 
{ 
// Get pressed key (code) 
NSString * character = [keyDownEvent characters]; 
     unichar keyCode = [character characterAtIndex: 0]; 

// Player movement 
if (keyCode == 119) { 
    playerMoveUp = TRUE; 
} else if (keyCode == 115) { 
    playerMoveDown = TRUE; 
} 
if (keyCode == 100) { 
    playerMoveLeft = TRUE; 
} else if (keyCode == 97) { 
    playerMoveRight = TRUE; 
} 
} 

- (void)ccKeyUp:(NSEvent*)keyUpEvent 
{ 
// Get pressed key (code) 
NSString * character = [keyUpEvent characters]; 
     unichar keyCode = [character characterAtIndex: 0]; 

// Player movement 
if (keyCode == 119) { 
    playerMoveUp = FALSE; 
} else if (keyCode == 115) { 
    playerMoveDown = FALSE; 
} 
if (keyCode == 100) { 
    playerMoveLeft = FALSE; 
} else if (keyCode == 97) { 
    playerMoveRight = FALSE; 
} 
}

Gametime循环：

-(void) tick: (ccTime) dt 
{ 
// Get player current position 
NSInteger playerPositionX = player.position.x; 
NSInteger playerPositionY = player.position.y; 

// Player movement 
if (playerMoveUp == TRUE) { 
    player.position = ccp(playerPositionX, playerPositionY + 1); 
} 
if (playerMoveDown == TRUE) { 
    player.position = ccp(playerPositionX, playerPositionY - 1); 
} 
if (playerMoveLeft == TRUE) { 
    player.position = ccp(playerPositionX + 1, playerPositionY); 
} 
if (playerMoveRight == TRUE) { 
    player.position = ccp(playerPositionX - 1, playerPositionY); 
} 
}

我的问题是，当移动离开了我的球员是不可能添加上键的同时，让玩家将向左和向上移动。达到此目的的最佳方法是什么？

来源

2010-12-09 Justin Dijkshoorn