cocos2d ccTouchBegan不被调用

参考自：http://blog.sina.com.cn/s/blog_61e26bcb0100xwqe.html

CCLayer 里面的 ccTouchBegan 和 ccTouchesBegan 到底调用哪个？

默认调用的是 ccTouchesBegan 方法~

添加了如下代码的话

/**
 * 2012。08。30。12。56~
 * 启用 ccTouchEnded，禁用默认的 ccTouchesEnded~
 */
-(void) registerWithTouchDispatcher {
    [[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:true];
}

就会调用 ccTouchBegan 方法~

而且，ccTouchBegan 里面返回 NO，触摸事件就不会继续往下传递

为什么呢？

下面是我在 CCTouchHandler.m 里面扒出来的两块儿代码：

-(id) initWithDelegate:(id)del priority:(int)pri
{
	if( (self=[super initWithDelegate:del priority:pri]) ) {
		if( [del respondsToSelector:@selector(ccTouchesBegan:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorBeganBit;
		if( [del respondsToSelector:@selector(ccTouchesMoved:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorMovedBit;
		if( [del respondsToSelector:@selector(ccTouchesEnded:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorEndedBit;
		if( [del respondsToSelector:@selector(ccTouchesCancelled:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorCancelledBit;
	}
	return self;
}

- (id)initWithDelegate:(id)aDelegate priority:(int)aPriority swallowsTouches:(BOOL)swallow
{
	if ((self = [super initWithDelegate:aDelegate priority:aPriority])) {	
		claimedTouches = [[NSMutableSet alloc] initWithCapacity:2];
		swallowsTouches = swallow;
		
		if( [aDelegate respondsToSelector:@selector(ccTouchBegan:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorBeganBit;
		if( [aDelegate respondsToSelector:@selector(ccTouchMoved:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorMovedBit;
		if( [aDelegate respondsToSelector:@selector(ccTouchEnded:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorEndedBit;
		if( [aDelegate respondsToSelector:@selector(ccTouchCancelled:withEvent:)] )
			enabledSelectors_ |= kCCTouchSelectorCancelledBit;
	}
	
	return self;
}

观察后发现，其实就是做一些配置，然后就会注册各自的一批关于触摸的方法~
最后，使用的是默认的配置调用 ccTouchesBegan 等方法的话，

可以采用如下写法的：

UITouch* touch = [touches anyObject];

不一定非要快速遍历一趟的

for(UITouch* touch in touches) {
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];
}

（如果不在 RootViewController.m 中添加开启多点触控特性的代码的话，touches 里面是不会有多个触摸点对象的）~