feat(UI/Canvas): Add toggle visibility

Author: jcs090218

Assets/JCSUnity/Scripts/UI/JCS_Canvas.cs

@@ -165,6 +165,18 @@ public void Hide(bool mute = false)
                 JCS_SoundPlayer.PlayByAttachment(mActiveSound, JCS_SoundMethod.PLAY_SOUND);
         }
 
+        /// <summary>
+        /// Toggle the canvas' visibility.
+        /// </summary>
+        /// <param name="mute"> True to mute the sound. </param>
+        public void ToggleVisibility(bool mute = false)
+        {
+            if (mCanvas.enabled)
+                Hide(mute);
+            else
+                Show(mute);
+        }
+
         /// <summary>
         /// Prompt warning if there are multiple main canvases in the scene.
         /// </summary>