效果图：
按照上一节的方法，将剪切-复制-粘贴图标放置到工具栏后，为其指定槽函数。这些功能无需自己编写代码来实现，QPlainTextEdit提供了实现这些编辑功能的槽函数，如cut()、copy()、paste()等，只需要将这些Action和相应的槽函数关联即可。
然后将ui转换成py文件，执行即可。
ui_mainWindow.py
# -*- coding: utf-8 -*- # Form implementation generated from reading ui file 'ui_mainWindow.ui' # # Created by: PyQt5 UI code generator 5.13.0 # # WARNING! All changes made in this file will be lost! from PyQt5 import QtCore, QtGui, QtWidgets class Ui_MainWindow(object): def setupUi(self, MainWindow): MainWindow.setObjectName("MainWindow") MainWindow.resize(532, 367) self.centralwidget = QtWidgets.QWidget(MainWindow) self.centralwidget.setObjectName("centralwidget") self.plainTextEdit = QtWidgets.QPlainTextEdit(self.centralwidget) self.plainTextEdit.setGeometry(QtCore.QRect(0, 0, 531, 291)) font = QtGui.QFont() font.setPointSize(18) self.plainTextEdit.setFont(font) self.plainTextEdit.setObjectName("plainTextEdit") MainWindow.setCentralWidget(self.centralwidget) self.menubar = QtWidgets.QMenuBar(MainWindow) self.menubar.setGeometry(QtCore.QRect(0, 0, 532, 21)) self.menubar.setObjectName("menubar") self.menu = QtWidgets.QMenu(self.menubar) self.menu.setObjectName("menu") self.menu_2 = QtWidgets.QMenu(self.menubar) self.menu_2.setObjectName("menu_2") self.menu_3 = QtWidgets.QMenu(self.menubar) self.menu_3.setObjectName("menu_3") MainWindow.setMenuBar(self.menubar) self.toolBar = QtWidgets.QToolBar(MainWindow) self.toolBar.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly) self.toolBar.setObjectName("toolBar") MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.toolBar) self.actFont_Italic = QtWidgets.QAction(MainWindow) self.actFont_Italic.setCheckable(True) icon = QtGui.QIcon() icon.addPixmap(QtGui.QPixmap("icons/images/Italic.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actFont_Italic.setIcon(icon) self.actFont_Italic.setObjectName("actFont_Italic") self.actFont_Bold = QtWidgets.QAction(MainWindow) self.actFont_Bold.setCheckable(True) icon1 = QtGui.QIcon() icon1.addPixmap(QtGui.QPixmap("icons/images/Bold.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actFont_Bold.setIcon(icon1) self.actFont_Bold.setObjectName("actFont_Bold") self.actFont_Underline = QtWidgets.QAction(MainWindow) self.actFont_Underline.setCheckable(True) icon2 = QtGui.QIcon() icon2.addPixmap(QtGui.QPixmap("icons/images/underline.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actFont_Underline.setIcon(icon2) self.actFont_Underline.setObjectName("actFont_Underline") self.actEdit_Cut = QtWidgets.QAction(MainWindow) icon3 = QtGui.QIcon() icon3.addPixmap(QtGui.QPixmap("icons/images/cut.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actEdit_Cut.setIcon(icon3) self.actEdit_Cut.setObjectName("actEdit_Cut") self.actEdit_Copy = QtWidgets.QAction(MainWindow) icon4 = QtGui.QIcon() icon4.addPixmap(QtGui.QPixmap("icons/images/copy.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actEdit_Copy.setIcon(icon4) self.actEdit_Copy.setObjectName("actEdit_Copy") self.actEdit_Paste = QtWidgets.QAction(MainWindow) icon5 = QtGui.QIcon() icon5.addPixmap(QtGui.QPixmap("icons/images/paste.jpg"), QtGui.QIcon.Normal, QtGui.QIcon.Off) self.actEdit_Paste.setIcon(icon5) self.actEdit_Paste.setObjectName("actEdit_Paste") self.menubar.addAction(self.menu.menuAction()) self.menubar.addAction(self.menu_2.menuAction()) self.menubar.addAction(self.menu_3.menuAction()) self.toolBar.addAction(self.actFont_Italic) self.toolBar.addSeparator() self.toolBar.addAction(self.actFont_Bold) self.toolBar.addSeparator() self.toolBar.addAction(self.actFont_Underline) self.toolBar.addSeparator() self.toolBar.addAction(self.actEdit_Cut) self.toolBar.addAction(self.actEdit_Copy) self.toolBar.addAction(self.actEdit_Paste) self.toolBar.addSeparator() self.retranslateUi(MainWindow) self.actEdit_Cut.triggered.connect(self.plainTextEdit.cut) self.actEdit_Copy.triggered.connect(self.plainTextEdit.copy) self.actEdit_Paste.triggered.connect(self.plainTextEdit.paste) QtCore.QMetaObject.connectSlotsByName(MainWindow) def retranslateUi(self, MainWindow): _translate = QtCore.QCoreApplication.translate MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow")) self.menu.setTitle(_translate("MainWindow", "文件(F)")) self.menu_2.setTitle(_translate("MainWindow", "编辑(E)")) self.menu_3.setTitle(_translate("MainWindow", "格式(M)")) self.toolBar.setWindowTitle(_translate("MainWindow", "toolBar")) self.actFont_Italic.setText(_translate("MainWindow", "斜体")) self.actFont_Italic.setToolTip(_translate("MainWindow", "<html><head/><body><p><span style=" font-style:italic;">斜体</span></p></body></html>")) self.actFont_Bold.setText(_translate("MainWindow", "粗体")) self.actFont_Bold.setToolTip(_translate("MainWindow", "加粗")) self.actFont_Underline.setText(_translate("MainWindow", "下划线")) self.actFont_Underline.setToolTip(_translate("MainWindow", "下划线")) self.actEdit_Cut.setText(_translate("MainWindow", "剪切")) self.actEdit_Cut.setToolTip(_translate("MainWindow", "剪切到粘贴板")) self.actEdit_Cut.setShortcut(_translate("MainWindow", "Ctrl+X")) self.actEdit_Copy.setText(_translate("MainWindow", "复制")) self.actEdit_Copy.setToolTip(_translate("MainWindow", "复制到粘贴板")) self.actEdit_Copy.setShortcut(_translate("MainWindow", "Ctrl+C")) self.actEdit_Paste.setText(_translate("MainWindow", "粘贴")) self.actEdit_Paste.setToolTip(_translate("MainWindow", "从粘贴板粘贴")) self.actEdit_Paste.setShortcut(_translate("MainWindow", "Ctrl+V"))
myMainWindow.py
#!/usr/bin/env python # _*_ coding: UTF-8 _*_ """================================================= @Project -> File : Operate-system -> myMainWindow.py @IDE : PyCharm @Author : zihan @Date : 2020/4/11 14:44 @Desc : =================================================""" import sys from PyQt5.QtWidgets import (QApplication, QMainWindow, QActionGroup, QLabel, QProgressBar, QSpinBox, QFontComboBox) from PyQt5.QtCore import Qt, pyqtSlot from PyQt5.QtGui import QTextCharFormat, QFont from ui_mainWindow import Ui_MainWindow class QmyMainWindow(QMainWindow): def __init__(self, parent=None): super().__init__(parent) self.ui = Ui_MainWindow() self.ui.setupUi(self) # 设置斜体 self.ui.actFont_Italic.triggered.connect(self.do_act_font_italic_triggered) # 设置粗体 self.ui.actFont_Bold.triggered.connect(self.do_act_font_bold_triggered) # 设置下划线 self.ui.actFont_Underline.triggered.connect(self.do_act_underline_triggered) @pyqtSlot(bool) def do_act_font_italic_triggered(self, checked): # 斜体 fmt = self.ui.plainTextEdit.currentCharFormat() fmt.setFontItalic(checked) self.ui.plainTextEdit.mergeCurrentCharFormat(fmt) @pyqtSlot(bool) def do_act_font_bold_triggered(self, checked): # 粗体 fmt = self.ui.plainTextEdit.currentCharFormat() if checked: fmt.setFontWeight(QFont.Bold) else: fmt.setFontWeight(QFont.Normal) self.ui.plainTextEdit.mergeCurrentCharFormat(fmt) @pyqtSlot(bool) def do_act_underline_triggered(self, checked): # 下划线 fmt = self.ui.plainTextEdit.currentCharFormat() fmt.setFontUnderline(checked) self.ui.plainTextEdit.mergeCurrentCharFormat(fmt) if __name__ == "__main__": app = QApplication(sys.argv) # 创建app，用QApplication类 form = QmyMainWindow() form.show() sys.exit(app.exec_())
ok.