小程序拍照的时候有个模板框，用于引导用户在框内拍照。已知这个框的宽高比，希望能保证长边完全显示的同时，这个图片能最大显示。image有属性mode，但是cover-image内没有mode属性，希望能通过一些别的方法达到同样的效果，求帮！！！
相关问题
相关文档
- cover-image: 小程序/开发/组件/视图容器/cover-image
- Inquiry Delivery Mode: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
- Set up delivery mode: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Set up delivery mode
- Interface call request specification: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
- Request Parameter Sample: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Distribution mode interface/Inquiry Delivery Mode
同问，有解决方案吗？
使用 camera 组件拍照，在拍照界面，用 cover-view 做一个辅助线，让用户在辅助线内拍摄