說明

本例，展示了通過登錄界面打開主界面的實現(xiàn)方式。
其中，登錄的賬號與密碼判斷都比較簡單，請大家根據(jù)自己需要，自行完善補充。

【如下代碼，完全復(fù)制，直接運行，即可使用】

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
################################################
#######創(chuàng)建主窗口
################################################
class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setWindowTitle('主界面')
        self.showMaximized()



################################################
#######對話框
################################################
class logindialog(QDialog):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setWindowTitle('登錄界面')
        self.resize(200, 200)
        self.setFixedSize(self.width(), self.height())
        self.setWindowFlags(Qt.WindowCloseButtonHint)

        ###### 設(shè)置界面控件
        self.frame = QFrame(self)
        self.verticalLayout = QVBoxLayout(self.frame)

        self.lineEdit_account = QLineEdit()
        self.lineEdit_account.setPlaceholderText("請輸入賬號")
        self.verticalLayout.addWidget(self.lineEdit_account)

        self.lineEdit_password = QLineEdit()
        self.lineEdit_password.setPlaceholderText("請輸入密碼")
        self.verticalLayout.addWidget(self.lineEdit_password)

        self.pushButton_enter = QPushButton()
        self.pushButton_enter.setText("確定")
        self.verticalLayout.addWidget(self.pushButton_enter)

        self.pushButton_quit = QPushButton()
        self.pushButton_quit.setText("取消")
        self.verticalLayout.addWidget(self.pushButton_quit)

        ###### 綁定按鈕事件
        self.pushButton_enter.clicked.connect(self.on_pushButton_enter_clicked)
        self.pushButton_quit.clicked.connect(QCoreApplication.instance().quit)





    def on_pushButton_enter_clicked(self):
        # 賬號判斷
        if self.lineEdit_account.text() == "":
            return

        # 密碼判斷
        if self.lineEdit_password.text() == "":
            return

        # 通過驗證，關(guān)閉對話框并返回1
        self.accept()




################################################
#######程序入門
################################################
if __name__ == "__main__":
    app = QApplication(sys.argv)
    dialog = logindialog()
    if  dialog.exec_()==QDialog.Accepted:
        the_window = MainWindow()
        the_window.show()
        sys.exit(app.exec_())

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