PyQt5 QDoubleSpinBox – 获取值改变信号
在本文中,我们将了解如何获取 QDoubleSpinBox 的值变化信号。用户可以通过鼠标和键盘为 QDoubleSpinBox 设置任何十进制值(浮点数),但有时需要以编程方式设置值以覆盖用户输入的值,可以借助setValue
设置方法。当值发生变化时,会发出此信号。
为此,我们将valueChanged
方法与 QDateTimeEdit 对象一起使用。
Syntax : dd_spin.valueChanged.connect(method)
Argument : It takes method as argument
Return : It returns None
下面是实现
# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("Python ")
# setting geometry
self.setGeometry(100, 100, 500, 400)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for components
def UiComponents(self):
# creating double spin box
d_spin = QDoubleSpinBox(self)
# setting geometry to the double spin box
d_spin.setGeometry(100, 100, 150, 40)
# creating a label
label = QLabel("GeeksforGeeks", self)
# setting geometry to the label
label.setGeometry(100, 200, 300, 80)
# making label multi line
label.setWordWrap(True)
# getting value changed signal of double spin box
d_spin.valueChanged.connect(lambda: spin_method())
def spin_method():
# setting text to the label
label.setText("Value Changed Signal")
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())
输出 :