注销功能
# 动作一：注销 def on_printAction1_triggered(self): self.close() dialog = logindialog() if dialog.exec_()==QDialog.Accepted: the_window = MainWindow() self.windowList.append(the_window) #这句一定要写，不然无法重新登录 the_window.show()
退出功能
# 动作二：退出 def on_printAction2_triggered(self): self.close()
还是很简单的吧，好了，下面给出完整代码。
完整代码
【如下代码，完全复制，直接运行，即可使用】
import sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *#######################################################创建主窗口################################################class MainWindow(QMainWindow):
windowList = [] def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.setWindowTitle('主界面')
self.showMaximized() # 创建菜单栏
self.createMenus() def createMenus(self):
# 创建动作 注销
self.printAction1 = QAction(self.tr("注销"), self)
self.printAction1.triggered.connect(self.on_printAction1_triggered) # 创建动作 退出
self.printAction2 = QAction(self.tr("退出"), self)
self.printAction2.triggered.connect(self.on_printAction2_triggered) # 创建菜单，添加动作
self.printMenu = self.menuBar().addMenu(self.tr("注销和退出"))
self.printMenu.addAction(self.printAction1)
self.printMenu.addAction(self.printAction2) # 动作一：注销
def on_printAction1_triggered(self):
self.close()
dialog = logindialog() if dialog.exec_()==QDialog.Accepted:
the_window = MainWindow()
self.windowList.append(the_window) #这句一定要写，不然无法重新登录
the_window.show() # 动作二：退出
def on_printAction2_triggered(self):
self.close() # 关闭界面触发事件
def closeEvent(self, event):
print(999999999) pass#######################################################对话框################################################class logindialog(QDialog):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.setWindowTitle('登录界面')
self.resize(200, 200)
self.setFixedSize(self.width(), self.height())
self.setWindowFlags(Qt.WindowCloseButtonHint) ###### 设置界面控件
self.frame = QFrame(self)
self.verticalLayout = QVBoxLayout(self.frame)
self.lineEdit_account = QLineEdit()
self.lineEdit_account.setPlaceholderText("请输入账号")
self.verticalLayout.addWidget(self.lineEdit_account)
self.lineEdit_password = QLineEdit()
self.lineEdit_password.setPlaceholderText("请输入密码")
self.verticalLayout.addWidget(self.lineEdit_password)
self.pushButton_enter = QPushButton()
self.pushButton_enter.setText("确定")
self.verticalLayout.addWidget(self.pushButton_enter)
self.pushButton_quit = QPushButton()
self.pushButton_quit.setText("取消")
self.verticalLayout.addWidget(self.pushButton_quit) ###### 绑定按钮事件
self.pushButton_enter.clicked.connect(self.on_pushButton_enter_clicked)
self.pushButton_quit.clicked.connect(QCoreApplication.instance().quit) def on_pushButton_enter_clicked(self):
# 账号判断
if self.lineEdit_account.text() == "": return
# 密码判断
if self.lineEdit_password.text() == "": return
# 通过验证，关闭对话框并返回1
self.accept()#######################################################程序入门################################################if __name__ == "__main__":
app = QApplication(sys.argv)
dialog = logindialog() if dialog.exec_()==QDialog.Accepted:
the_window = MainWindow()
the_window.show()
sys.exit(app.exec_())
作者：一心狮
链接：https://www.jianshu.com/p/36fbc86e3b99
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