private static void InitRoot()
{
var go = new GameObject("UIRoot");
DontDestroyOnLoad(go);
// clear Canvas
var canObj = GameObject.Find("Canvas");
if (canObj != null)
{
DestroyImmediate(canObj);
}
//clear Event System
var esObj = GameObject.Find("EventSystem");
if (esObj != null)
{
DestroyImmediate(esObj);
}
go.layer = LayerMask.NameToLayer("UI");
_instance = go.AddComponent <UIRoot>();
go.AddComponent <RectTransform>();
_instance.Root = go.transform;
var canvas = go.AddComponent <Canvas>();
canvas.renderMode = RenderMode.ScreenSpaceCamera;
canvas.pixelPerfect = true;
var camObj = new GameObject("UICamera");
camObj.layer = LayerMask.NameToLayer("UI");
camObj.transform.parent = go.transform;
camObj.transform.localPosition = new Vector3(0, 0, -100f);
var uiCamera = camObj.AddComponent <Camera>();
uiCamera.clearFlags = CameraClearFlags.Depth;
uiCamera.orthographic = true;
uiCamera.farClipPlane = 200f;
canvas.worldCamera = uiCamera;
_instance.UICamera = uiCamera;
uiCamera.cullingMask = 1 << 5;
uiCamera.nearClipPlane = -50f;
uiCamera.farClipPlane = 50f;
uiCamera.allowMSAA = false;
uiCamera.allowHDR = false;
//add audio listener
camObj.AddComponent <AudioListener>();
var cs = go.AddComponent <CanvasScaler>();
cs.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
cs.referenceResolution = new Vector2(1136f, 640f);
cs.screenMatchMode = CanvasScaler.ScreenMatchMode.Expand;
//set the raycaster
//GraphicRaycaster gr = go.AddComponent<GraphicRaycaster>();
_instance.FixedRoot = CreateSubCanvas(go.transform, 250, "FixedRoot");
_instance.NormalRoot = CreateSubCanvas(go.transform, 0, "NormalRoot");
_instance.PopupRoot = CreateSubCanvas(go.transform, 500, "PopupRoot");
//add Event System
var eventObj = new GameObject("EventSystem");
eventObj.layer = LayerMask.NameToLayer("UI");
eventObj.transform.SetParent(go.transform);
eventObj.transform.localPosition = Vector3.zero;
eventObj.transform.localRotation = Quaternion.identity;
eventObj.transform.localScale = Vector3.one;
eventObj.AddComponent <EventSystem>();
var inputModule = eventObj.AddComponent <StandaloneInputModule>();
inputModule.forceModuleActive = true;
}
private void OnDestroy()
{
_instance = null;
}