iOS下默认是不开启多点触控的，我们要想要使用需要做如下的内容：
iOS文件夹下：AppController.mm
需要加一行代码：
//只需要新增这样一行代码就可以使用多点触控啦。
[eaglView setMultipleTouchEnabled:YES];
具体位置见下面：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
// Add the view controller's view to the window and display.
window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
// Init the CCEAGLView
CCEAGLView *eaglView = [CCEAGLView viewWithFrame: [window bounds]
pixelFormat: kEAGLColorFormatRGBA8
depthFormat: GL_DEPTH24_STENCIL8_OES
preserveBackbuffer: NO
sharegroup: nil
multiSampling: NO
numberOfSamples: 0];
// Use RootViewController manage CCEAGLView
_viewController = [[RootViewController alloc] initWithNibName:nil bundle:nil];
_viewController.wantsFullScreenLayout = YES;
_viewController.view = eaglView;
//只需要新增这样一行代码就可以使用多点触控啦。
[eaglView setMultipleTouchEnabled:YES];
// Set RootViewController to window
if ( [[UIDevice currentDevice].systemVersion floatValue] setOpenGLView(glview);
cocos2d::Application::getInstance()->run();
return YES;
}
测试：
auto listener1 = EventListenerTouchAllAtOnce::create();
listener1->setEnabled(true);
listener1->onTouchesBegan = [ = ](const std::vector& touches, Event* event)
{
log("%lu",touches.size());
};
_eventDispatcher->addEventListenerWithFixedPriority(listener1, 1);
