编辑器中预览时
director.root.batcher2D.getFirstRenderCamera
在切换场景之后，返回Editor Camera
测试代码如下
setInterval(() => {
let camera = director.root.batcher2D.getFirstRenderCamera(find("UICanvas"));
console.log("Camera name: ", camera.name);
}, 1000);
>> 场景切换之前Camera Name: UICamera
>> 场景切换之后Camera Name: Editor Camera