对象，用于传递要用于默认控件的资源。
| background | 用于背景元素的 Sprite。 |
| checkmark | 用于在存在时表示“打开”状态（如复选标记）的 Sprite。 |
| dropdown | 用于指示按钮会在单击时打开下拉列表的 Sprite。 |
| inputField | 用作输入字段背景的 Sprite。 |
| knob | 用于可以拖动的旋钮（如滑动条）的 Sprite。 |
| mask | 用于遮罩（例如用于滚动视图的视口）的 Sprite。 |
| standard | 要用于图形 UI 元素的主要 Sprite，由按钮、开关和下拉列表控件等使用。 |
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