PyQt5-QComboBox控件使用

 1 #QComboBox下拉列表控件使用,省市级联
 2 from PyQt5.QtWidgets import  QPushButton,QVBoxLayout,QWidget,QApplication,QRadioButton,QHBoxLayout,QCheckBox,QGroupBox,QComboBox
 3 from PyQt5.QtGui import QIcon,QPixmap
 4 from PyQt5.QtCore import  Qt
 5 
 6 import sys
 7 
 8 class WindowClass(QWidget):
 9 
10     def __init__(self,parent=None):
11         self.citys = {"北京": ["北京"], "上海": ["上海"], "河北省": ["石家庄", "邯郸"]}
12         super(WindowClass, self).__init__(parent)
13         layout=QVBoxLayout()
14         self.comboBox_1=QComboBox()
15         self.comboBox_1.addItem("--请选择--")
16         self.comboBox_1.addItem("北京")
17         self.comboBox_1.addItem("上海")
18         self.comboBox_1.addItem("河北省")
19         self.comboBox_1.addItems(["湖南省","湖北省","天津"])
20 
21         self.comboBox_2 = QComboBox()
22         self.comboBox_2.addItem("--请选择--")
23 
24         layout.addWidget(self.comboBox_1)
25         layout.addWidget(self.comboBox_2)
26         self.comboBox_1.currentIndexChanged.connect(self.btnState)
27 
28         self.setLayout(layout)
29     def btnState(self):
30         print("状态：",self.comboBox_1.currentText())
31         # for count in range(self.comboBox_1.count()):
32         #     print("列表选项:" ,self.comboBox_1.itemText(count),count)
33 
34         province=self.comboBox_1.currentText()
35         print(province in  self.citys.keys())
36         if province!="--请选择--":
37             self.comboBox_2.clear()
38             self.comboBox_2.addItems(self.citys[province] if   province in  self.citys.keys() else ["--请选择--"])
39         else:
40             self.comboBox_2.clear()
41             self.comboBox_2.addItem("--请选择--")
42 
43 
44 
45 if __name__=="__main__":
46     app=QApplication(sys.argv)
47     win=WindowClass()
48     win.show()
49     sys.exit(app.exec_())