cocos2d-x lua 使用自定义消息EventCustom

version: cocos2d-x 3.6

1.发送消息

-- post message
-- event将会被传递给消息接收函数，所以所有需要传递的数据都可放到event中
local event = cc.EventCustom:new("MSG_TEST")
event._usedata = {["state"]=self.curState,["actionId"]=self.actionId}
cc.Director:getInstance():getEventDispatcher():dispatchEvent(event)

2.监听与接收

• 监听消息需要调用self:enableNodeEvents()使消息接收有效

-- listener
local ActorSprite = class("ActorSprite",cc.Node)
 
function ActorSprite:initEventListener()
    self:enableNodeEvents()  -- cc.Node
    self.eventListeners = {} -- user to delete when dtor
 
    local listener = cc.EventListenerCustom:create(MSG_TEST,handler(self,self.onChangeState))
    local eventDispatcher = self:getEventDispatcher()
    eventDispatcher:addEventListenerWithFixedPriority(listener,1)
    table.insert(self.eventListeners,listener) 
end
 
function DogSprite:onChangeState(event)
    local dogId = event._usedata["dogId"]
    local actionId = event._usedata["actionId"]
    local eventName = event:getEventName()
end
 
return ActorSprite

3.清理

• 在ActorSprite被释放之后，需要将监听删除，否则收到消息后self为nil，将会导致异常(onCleanup将会在节点被删除时自动调用)。

function ActorSprite:onCleanup()  -- cc.Node
    for i,var in ipairs(self.eventListeners) do
        cc.Director:getInstance():getEventDispatcher():removeEventListener(var)
    end  
end