PyQt5 QPushButton

QPushButton是 PyQt 中的一个简单按钮，当用户单击时，会执行一些相关的操作。为了将此按钮添加到应用程序中，使用了QPushButton class 。

例子：

一个带有按钮的窗口，单击时会显示一条消息“您单击了按钮”。

下面是代码：

from PyQt5 import QtCore, QtGui, QtWidgets
import sys
  
class Ui_MainWindow(object):
  
    def setupUi(self, MainWindow):
        MainWindow.resize(506, 312)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
          
        # adding pushbutton
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(200, 150, 93, 28))
  
        # adding signal and slot 
        self.pushButton.clicked.connect(self.changelabeltext)
    
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(140, 90, 221, 20))      
  
        # keeping the text of label empty before button get clicked
        self.label.setText("")     
         
        MainWindow.setCentralWidget(self.centralwidget)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
  
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Push Button"))
          
    def changelabeltext(self):
  
        # changing the text of label after button get clicked
        self.label.setText("You clicked PushButton")    
  
        # Hiding pushbutton from the main window
        # after button get clicked. 
        self.pushButton.hide()   
  
if __name__ == "__main__": 
    app = QtWidgets.QApplication(sys.argv) 
    
    MainWindow = QtWidgets.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show()
   
    sys.exit(app.exec_()) 

输出：

主窗口有按钮。

单击按钮后出现消息“您单击了按钮。