IOS区分 单指按下和双指按下的代码

如何区分单指tap和双指tap呢

直接上代码 若使用UIKit请自行修改函数名称 以下是cocos2d代码

//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];//双指tap
            [GameTouches removeAllObjects];
        }
    }else
    {
        [self jump];//多指tap
    }
}
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    if (GameTouches.allObjects.count==1) {
        [self fire];//单指tap
    }
    [GameTouches removeAllObjects];
}
- (void)ccTouchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self ccTouchesEnded:touches withEvent:event];
}