PyQt5 QSpinBox – 检查信号是否被阻塞

在本文中，我们将看到如何检查信号是否被旋转框阻塞，阻塞信号意味着与旋转框连接的方法将不会接收到信号，例如当我们向它添加动作时，当它的值发生变化时行动将不起作用。被阻塞时发出的信号不会被缓冲。为了阻止信号，我们使用blockSignals方法。

为了做到这一点，我们使用了 signalsBlocked 方法。

Syntax : spin_box.signalsBlocked()

Argument : It takes no argument

Return : It returns None

编程需要懂一点英语

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, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # blocking signals of the spin box
        self.spin.blockSignals(True)
  
        # creating a label
        self.label = QLabel("Label ", self)
  
        # setting geometry to the label
        self.label.setGeometry(100, 200, 300, 30)
  
        # checking if signals are blocked or not
        check = self.spin.signalsBlocked()
  
        # setting text to the label
        self.label.setText("Signals Blocked ? : " + str(check))
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：