堆疊部件頁

Question

我不能回去的堆疊部件上，當我點擊取消按鈕的第一頁（從cancel_button_clicked（個體經營）：功能）

from PyQt5 import QtCore, QtWidgets 

from PyQt5.QtWidgets import QMessageBox 


class Ui_form(object): 

    def setupUi(self, form): 
     form.setObjectName("form") 
     form.resize(1000, 650) 
     self.groupBox = QtWidgets.QGroupBox(form) 
     self.groupBox.setGeometry(QtCore.QRect(530, 350, 451, 281)) 
     self.groupBox.setObjectName("groupBox") 
     self.stackedWidget = QtWidgets.QStackedWidget(self.groupBox) 
     self.stackedWidget.setGeometry(QtCore.QRect(9, 19, 431, 241)) 
     self.stackedWidget.setObjectName("stackedWidget") 
     self.page_1 = QtWidgets.QWidget() 
     self.page_1.setObjectName("page_1") 
     self.login_button = QtWidgets.QPushButton(self.page_1) 
     self.login_button.setGeometry(QtCore.QRect(20, 210, 75, 23)) 
     self.login_button.setObjectName("login_button") 
     self.register_button = QtWidgets.QPushButton(self.page_1) 
     self.register_button.setGeometry(QtCore.QRect(180, 210, 75, 23)) 
     self.register_button.setObjectName("register_button") 
     self.exit_button = QtWidgets.QPushButton(self.page_1) 
     self.exit_button.setGeometry(QtCore.QRect(330, 210, 75, 23)) 
     self.exit_button.setObjectName("exit_button") 
     self.username_line = QtWidgets.QLineEdit(self.page_1) 
     self.username_line.setGeometry(QtCore.QRect(230, 40, 113, 20)) 
     self.username_line.setObjectName("username_line") 
     self.password_line = QtWidgets.QLineEdit(self.page_1) 
     self.password_line.setGeometry(QtCore.QRect(230, 110, 113, 20)) 
     self.password_line.setObjectName("password_line") 
     self.username_label = QtWidgets.QLabel(self.page_1) 
     self.username_label.setGeometry(QtCore.QRect(60, 40, 81, 16)) 
     self.username_label.setObjectName("username_label") 
     self.password_label = QtWidgets.QLabel(self.page_1) 
     self.password_label.setGeometry(QtCore.QRect(60, 110, 61, 16)) 
     self.password_label.setObjectName("password_label") 
     self.stackedWidget.addWidget(self.page_1) 
     self.page_2 = QtWidgets.QWidget() 
     self.page_2.setObjectName("page_2") 
     self.registeruser_label = QtWidgets.QLabel(self.page_2) 
     self.registeruser_label.setGeometry(QtCore.QRect(60, 33, 71, 20)) 
     self.registeruser_label.setObjectName("registeruser_label") 
     self.registerepass_label = QtWidgets.QLabel(self.page_2) 
     self.registerepass_label.setGeometry(QtCore.QRect(60, 100, 61, 16)) 
     self.registerepass_label.setObjectName("registerepass_label") 
     self.registeruser_line = QtWidgets.QLineEdit(self.page_2) 
     self.registeruser_line.setGeometry(QtCore.QRect(240, 40, 113, 20)) 
     self.registeruser_line.setObjectName("registeruser_line") 
     self.registerpass_line = QtWidgets.QLineEdit(self.page_2) 
     self.registerpass_line.setGeometry(QtCore.QRect(240, 100, 113, 20)) 
     self.registerpass_line.setObjectName("registerpass_line") 
     self.signup_button = QtWidgets.QPushButton(self.page_2) 
     self.signup_button.setGeometry(QtCore.QRect(70, 190, 75, 23)) 
     self.signup_button.setObjectName("signup_button") 
     self.cancel_button = QtWidgets.QPushButton(self.page_2) 
     self.cancel_button.setGeometry(QtCore.QRect(270, 190, 75, 23)) 
     self.cancel_button.setObjectName("cancel_button") 
     self.stackedWidget.addWidget(self.page_2) 

     self.retranslateUi(form) 
     self.stackedWidget.setCurrentIndex(0) 

     self.login_button.clicked.connect(self.login_button_clicked) 
     self.register_button.clicked.connect(self.register_button_clicked) 

     self.cancel_button.clicked.connect(self.cancel_button_clicked) 
     self.exit_button.clicked.connect(self.exit_button_clicked) 


    def retranslateUi(self, form): 
     _translate = QtCore.QCoreApplication.translate 
     form.setWindowTitle(_translate("form", "Form")) 
     self.groupBox.setTitle(_translate("form", "USER")) 
     self.login_button.setText(_translate("form", "LOG IN")) 
     self.register_button.setText(_translate("form", "REGISTER")) 
     self.exit_button.setText(_translate("form", "EXIT")) 
     self.username_label.setText(_translate("form", "USERNAME")) 
     self.password_label.setText(_translate("form", "PASSWORD")) 
     self.registeruser_label.setText(_translate("form", "USERNAME")) 
     self.registerepass_label.setText(_translate("form", "PASSWORD")) 
     self.signup_button.setText(_translate("form", "SIGN UP")) 
     self.cancel_button.setText(_translate("form", "CANCEL")) 

    def login_button_clicked(self): 
     file = open('user.txt','r') 
     for line in file: 
      us, pa = line.rstrip().split(';') 
      if self.username_line.text() == us and self.password_line.text() == pa: 
       QMessageBox.information(QMessageBox(), "Login", "LOGIN SUCCESS!") 
       break 
     else: 
      QMessageBox.information(QMessageBox(), "login", "LOGIN FAILED!") 


    def register_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(1) 

    def cancel_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(-1) 

    def exit_button_clicked(self): 
     self.close() 

if __name__ == '__main__': 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    LOGIN_window = QtWidgets.QDialog() 
    LOGIN = Ui_form() 
    LOGIN.setupUi(LOGIN_window) 

    LOGIN_window.show() 

    sys.exit(app.exec_()) 

Answer 1

不建議修改Qt Designer生成的類，如果你是初學者，則更糟糕。最值得推薦的是創建一個實現邏輯並使用已經創建的設計的類。

要做到這一點，您必須選擇適當的Widget，如果您用作MainWindow的模板，您應該使用QMainWindow，如果您使用Widget，則必須使用QWidget，如果您使用任何Dialog變體，則應該使用QDialog作爲我認爲是這樣。

由於任務很簡單，沒有必要創建類似槽的方法，我們可以使用lambda函數：lambda: self.stackedWidget.setCurrentIndex(1)

所有我下面的代碼來實現上述的：

class Dialog(QtWidgets.QDialog, Ui_form): 
    def __init__(self, parent=None): 
     QtWidgets.QDialog.__init__(self, parent) 
     self.setupUi(self) 
     self.stackedWidget.setCurrentIndex(0) 

     self.login_button.clicked.connect(self.Confirm_Button_Clicked) 
     self.register_button.clicked.connect(lambda: self.stackedWidget.setCurrentIndex(1)) 
     self.cancel_button.clicked.connect(self.cancel_button_clicked) 

    def Confirm_Button_Clicked(self): 
     file = open('user.txt','r') 
     [...] 

    def cancel_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(0) 


if __name__ == '__main__': 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    w = Dialog() 
    w.show() 
    sys.exit(app.exec_()) 

注意：如果你想返回第一頁，你應該把0的值作爲當前索引，記住索引從0開始。