IOS區分 單指按下和雙指按下的代碼

如何區分單指tap和雙指tap呢

直接上代碼 若使用UIKit請自行修改函數名稱 以下是cocos2d代碼

//GameTouches = [[NSMutableSet alloc]init];- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    if (touches.count ==1) {        [GameTouches addObject:[touches anyObject]];        if(GameTouches.allObjects.count == 2)        {            [self jump];//雙指tap            [GameTouches removeAllObjects];        }    }else    {        [self jump];//多指tap    }}- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    if (GameTouches.allObjects.count==1) {        [self fire];//單指tap    }    [GameTouches removeAllObjects];}- (void)ccTouchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{    [self ccTouchesEnded:touches withEvent:event];}