如何检测外面的触摸（空白空间） - cocos2d

Question

这是我的代码，用于检测是否触摸特定的精灵

- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView:[myTouch view]];
location = [[CCDirector sharedDirector] convertToGL:location];

for(CCSprite *sprite in shapeArray)
{

    if(CGRectContainsPoint(sprite.boundingBox, location))
    {
        //There is a sprite that is touched
         mSpriteOnHand = sprite;
        currentPoint = mSpriteOnHand.position;

        break;
    } 
    //This part didn't work
    else
    {
      NSLog(@"Touch outside);
    }
}

}

现在我想检测触摸是否在外面（不在任何精灵或空白区域），但我不知道该怎么做。

Answer 1

如果您的触摸工作正常，我认为在for循环之外添加BOOL然后添加if语句，就像这样可行。

BOOL itemFound = NO;
for(CCSprite *sprite in shapeArray)
{

    if(CGRectContainsPoint(sprite.boundingBox, location))
    {
    //There is a sprite that is touched
        mSpriteOnHand = sprite;
        currentPoint = mSpriteOnHand.position;
        NSLog(@"item TOUCHED");
        itemFound = YES;
        break;
    } 
}

if (itemFound == NO)
{
     NSLog(@"Touch outside");
}