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To start digitizing new features, enable the Edit mode in the main menu (pencil button) and select the layer on which you want to add a new feature (the layer will be highlighted in green).
将屏幕中心的十字瞄准线移动待绘制线或面的起点，然后单击屏幕右下方的**加号(+)按钮**以添加第一个节点。
每点击一次**加号 (+)按钮 **就会添加一个新节点，通过连续添加节点构成线或面。
点击**减号(-)按钮**将删除最后一个添加的节点。
点击**关闭 (X)按钮**取消要素绘制。
当绘制了线要素的2个节点或面要素的3个节点后，将出现**保存按钮**，点击该按钮将完成绘制操作。
After digitizing a geometry, the attribute form will be displayed if it is not suppressed and the user will be asked to enter the attributes for the new feature. The form which appears allows entering attribute values for the new feature.
For quick collection of rather homogeneus datasets, it is crucial to not having to enter the same attribute values over an over. The checkboxes at the right of every attribute allow remembering each attribute individually so that the next time you will add a feature on the same layer, these attributes will be automatically pre-filled.
删除要素只能在编辑模式下使用。
To delete a feature, identify it first by a short tap on it. Then select it with a long press in the identification list, select further features to delete if you want and click the trash button to confirm the deletion.
To edit, tap on Menu button -> pencil.
You can edit an existing feature by moving, adding or deleting the vertex and also spliting.
It is possible to split an existing geometry by drawing a line where it should be split.
It is possible to move and delete vertices of geometries and add new ones.
The freehand digitizing mode allows users to 'draw' lines and polygons using their stylus/pen or mouse. The mode is available for line/polygon feature additions as well as the geometry editor's rings tool.
The freehand digitizing mode is activated through a new toolbar button which appears when QField is set to editing mode and a line or polygon vector is selected.
If topological editing is activated on the project QGIS before exporting for QField, shared nodes of neighbouring geometries are modified together when moving / deleting vertices and additional vertices are added to segments when a new node is added from neightbouring geometries.
You can make a multi-selection and edit all the features at the same time. In some cases, it can be very efficient.