選擇所有球員對象ObjectiveC

Question

我剛開始使用Objective C，我想知道選擇所有其他球員將isActive屬性設置爲NO的正確語法。謝謝！

- (void) playerBuzzedIn: (XGPlayer *) activePlayer 
{ 
    if (activePlayer) { 
     activePlayer.isActive = YES; 
    } 
    else 
     //set all other isActive = NO 
    self.currentGameState = results; 
} 

林想這樣的，是正確的：

for (XGPlayer *player in self.players) { 
player.isActive = NO; 
} 

Answer 1

首先你需要的所有球員名單;讓我們假設它是這樣的：

NSMutableArray *_allplayers = ...; 

然後在你的方法，你可以設置所有玩家從誰剛剛發出嗡嗡聲的一種非活性分開：

- (void) playerBuzzedIn: (XGPlayer *) activePlayer 
{ 
    if (activePlayer) 
    { 
     for (XGPlayer *player in _allPlayers) 
     { 
      player.isActive = activePlayer == player; // Or perhaps [activePlayer isEqual:player] ? 
     } 
    } 
    self.currentGameState = results; 
} 

另一種方法是一個指針保持當前活動玩家：

在.h文件中：

@interface Whatever : NSObject 
{ 
    XGPlayer *_activePlayer = nil; 
} 

@property (retain, nonatomic, readonly) XGPlayer *activePlayer; 

@end 

在.m文件：

// Private Methods 
@interface Whatever() 
- (void)setActivePlayer:(XGPlayer *)activePlayer 
@end 

@implementation Whatever 

@synthesize activePlayer = _activePlayer; 

// Private setter method 
- (void)setActivePlayer:(XGPlayer *)activePlayer 
{ 
    [activePlayer retain];  // If not using ARC 
    [_activePlayer release]; // If not using ARC 
    _activePlayer = activePlayer; 
} 

- (void) playerBuzzedIn: (XGPlayer *) activePlayer 
{ 
    self.activePlayer.isActive = NO; 
    activePlayer.isActive = YES; 
    self.activePlayer = activePlayer; 
    self.currentGameState = results; 
}