UGUI——RaycastTarget Checker

UGUI默认会打开一些组件的RaycastTarget属性。事实上，绝大部分的UI组件，是不需要响应Raycast的。出于性能优化考虑，这些不需要响应Raycast的UI组件，应该去掉其Raycast Target选项的勾选。

我这里写了个检查UI组件Raycast Target属性的工具，在脚本放在Project下任意的Editor目录下即可。

using UnityEditor;
using UnityEngine.UI;
using UnityEngine;

public class RaycastTargetChecker : EditorWindow
{
    private MaskableGraphic[] graphics;
    private bool hideUnchecked = false;
    private bool showBorders = true;
    private Color borderColor = Color.blue;
    private Vector2 scrollPosition = Vector2.zero;

    private static RaycastTargetChecker instance = null;

    [MenuItem ("Tools/RaycastTarget Checker")]
    private static void Open ()
    {
        instance = instance ?? EditorWindow.GetWindow<RaycastTargetChecker> ("RaycastTargets");
        instance.Show ();
    }

    void OnEnable ()
    {
        instance = this;
    }

    void OnDisable ()
    {
        instance = null;
    }

    void OnGUI ()
    {
        using (EditorGUILayout.HorizontalScope horizontalScope = new EditorGUILayout.HorizontalScope ()) {
            showBorders = EditorGUILayout.Toggle ("Show Gizmos", showBorders, GUILayout.Width (200.0f));
            borderColor = EditorGUILayout.ColorField (borderColor);
        }
        hideUnchecked = EditorGUILayout.Toggle ("Hide Unchecked", hideUnchecked);

        GUILayout.Space (12.0f);
        Rect rect = GUILayoutUtility.GetLastRect ();
        GUI.color = new Color (0.0f, 0.0f, 0.0f, 0.25f);
        GUI.DrawTexture (new Rect (0.0f, rect.yMin + 6.0f, Screen.width, 4.0f), EditorGUIUtility.whiteTexture);
        GUI.DrawTexture (new Rect (0.0f, rect.yMin + 6.0f, Screen.width, 1.0f), EditorGUIUtility.whiteTexture);
        GUI.DrawTexture (new Rect (0.0f, rect.yMin + 9.0f, Screen.width, 1.0f), EditorGUIUtility.whiteTexture);
        GUI.color = Color.white;

        graphics = GameObject.FindObjectsOfType<MaskableGraphic> ();

        using (GUILayout.ScrollViewScope scrollViewScope = new GUILayout.ScrollViewScope (scrollPosition)) {
            scrollPosition = scrollViewScope.scrollPosition;
            for (int i = 0; i < graphics.Length; i++) {
                MaskableGraphic graphic = graphics [i];
                if (hideUnchecked == false || graphic.raycastTarget == true) {
                    DrawElement (graphic);
                } 
            }
        }
        foreach (var item in graphics) {
            EditorUtility.SetDirty (item);
        }
        Repaint ();
    }

    private void DrawElement (MaskableGraphic graphic)
    {
        using (EditorGUILayout.HorizontalScope horizontalScope = new EditorGUILayout.HorizontalScope ()) {
            Undo.RecordObject (graphic, "Modify RaycastTarget");
            graphic.raycastTarget = EditorGUILayout.Toggle (graphic.raycastTarget, GUILayout.Width (20));
            EditorGUI.BeginDisabledGroup (true);
            EditorGUILayout.ObjectField (graphic, typeof(MaskableGraphic), true);
            EditorGUI.EndDisabledGroup ();
        }
    }

    [DrawGizmo (GizmoType.Selected | GizmoType.NonSelected)]
    private static void DrawGizmos (MaskableGraphic source, GizmoType gizmoType)
    {
        if (instance != null && instance.showBorders == true && source.raycastTarget == true) {
            Vector3[] corners = new Vector3[4];
            source.rectTransform.GetWorldCorners (corners);
            Gizmos.color = instance.borderColor;
            for (int i = 0; i < 4; i++) {
                Gizmos.DrawLine (corners [i], corners [(i + 1) % 4]);
            }
            if (Selection.activeGameObject == source.gameObject) {
                Gizmos.DrawLine (corners [0], corners [2]);
                Gizmos.DrawLine (corners [1], corners [3]);
            }
        }
        SceneView.RepaintAll ();
    }
}

使用方法很简单，打开Tools->RaycastTarget Checker，弹出主窗口，窗口下会显示场景下所有包含Raycast Target属性的组件。可以根据需要显示或隐藏Scene视图下的边框，以及设置边框颜色；也可以根据需要隐藏已经被取消勾选的UI组件。

效果图如下：