加载矢量数据

from os.path import basename

from PyQt5.QtGui import QFont, QColor
from osgeo import gdal
from qgis._core import QgsRasterLayer, QgsProject, QgsVectorLayer, QgsPalLayerSettings, QgsTextFormat, Qgis, \
    QgsVectorLayerSimpleLabeling
from qgis._gui import QgsMapCanvas

import utils.fileUtil as FileUtil


def open_shp_file(main):
    filepath = FileUtil.select_single_file(main, '等深线数据(*.shp)', 'last_dir_contour_shp')
    if filepath == '' or not filepath.endswith('.shp'):
        return

    gdal.SetConfigOption('SHAPE_RESTORE_SHX', 'YES')
    layer = QgsVectorLayer(filepath, basename(filepath), 'ogr')

    if not layer.isValid():
        return False

    # 设置标注
    layer_setting = QgsPalLayerSettings()
    layer_setting.drawLabels = True
    layer_setting.fieldName = layer.fields()[1].name()

    # 文本样式设置
    text_format = QgsTextFormat()
    text_format.setFont(QFont("Arial", 12))
    text_format.setColor(QColor(255, 255, 255))
    layer_setting.setFormat(text_format)
    layer_setting.placement = Qgis.LabelPlacement.Line
    layer_setting.placementFlags = QgsPalLayerSettings.AboveLine

    layer.setLabelsEnabled(True)
    layer.setLabeling(QgsVectorLayerSimpleLabeling(layer_setting))
    layer.triggerRepaint(True)

    canvas: QgsMapCanvas = main.preview_canvas
    QgsProject.instance().addMapLayer(layer)
    canvas.setLayers([layer] + canvas.layers())
    canvas.setDestinationCrs(layer.crs())
    canvas.setExtent(layer.extent())
    canvas.refresh()

from gui.preview.functions import open_raster_file, open_shp_file

def bind_func(main):
    _ui = main.ui
    # 添加栅格数据按钮绑定方法
    _ui.button_add_raster.clicked.connect(lambda self: open_raster_file(main))
    # 添加矢量数据按钮绑定方法
    _ui.button_add_shp.clicked.connect(lambda self: open_shp_file(main))