UI 组件：自旋器范例

文件：

• declarative/ui-components/spinner/spinner.svg
• declarative/ui-components/spinner/qml/spinner/main.qml
• declarative/ui-components/spinner/qml/spinner/content/Spinner.qml
• declarative/ui-components/spinner/main.cpp
• declarative/ui-components/spinner/spinner.pro
• declarative/ui-components/spinner/spinner.qmlproject