从QDialog到QMainWindow之间的连接 - PyQt5

Question

我已经创建了两个小部件（QMainWindow作为win_one和QDialog作为win_two）与qtdesigner和PyQt5。 从win_one开始，我打开win_two，填写lineEdit，然后按OK将条目转移到显示在win_one中的label。一切正常，除了两个问题：

1. win_one窗口被打开.showMaximized()但经过填充的标签，窗口的尺寸变化。
2. 从win_one按钮停止工作

front_win_one.py

from PyQt5 import QtCore, QtGui, QtWidgets 

class Ui_win_one(object): 
    def setupUi(self, win_one): 
     win_one.setObjectName("win_one") 
     win_one.resize(1147, 234) 
     self.centralwidget = QtWidgets.QWidget(win_one) 
     self.centralwidget.setObjectName("centralwidget") 
     self.pushButton = QtWidgets.QPushButton(self.centralwidget) 
     self.pushButton.setGeometry(QtCore.QRect(50, 50, 111, 51)) 
     self.pushButton.setObjectName("pushButton") 
     self.label = QtWidgets.QLabel(self.centralwidget) 
     self.label.setGeometry(QtCore.QRect(40, 160, 131, 31)) 
     self.label.setObjectName("label") 
     win_one.setCentralWidget(self.centralwidget) 

     self.retranslateUi(win_one) 
     QtCore.QMetaObject.connectSlotsByName(win_one) 

    def retranslateUi(self, win_one): 
     _translate = QtCore.QCoreApplication.translate 
     win_one.setWindowTitle(_translate("win_one", "MainWindow")) 
     self.pushButton.setText(_translate("win_one", "To qdialog")) 
     self.label.setText(_translate("win_one", "TextLabel")) 


if __name__ == "__main__": 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    win_one = QtWidgets.QMainWindow() 
    ui = Ui_win_one() 
    ui.setupUi(win_one) 
    win_one.show() 
    sys.exit(app.exec_()) 

front_win_two.py

from PyQt5 import QtCore, QtGui, QtWidgets 

class Ui_win_two(object): 
    def setupUi(self, win_two): 
     win_two.setObjectName("win_two") 
     win_two.resize(317, 278) 
     self.pushButton = QtWidgets.QPushButton(win_two) 
     self.pushButton.setGeometry(QtCore.QRect(40, 120, 121, 23)) 
     self.pushButton.setObjectName("pushButton") 
     self.lineEdit = QtWidgets.QLineEdit(win_two) 
     self.lineEdit.setGeometry(QtCore.QRect(30, 50, 161, 21)) 
     self.lineEdit.setObjectName("lineEdit") 

     self.retranslateUi(win_two) 
     QtCore.QMetaObject.connectSlotsByName(win_two) 

    def retranslateUi(self, win_two): 
     _translate = QtCore.QCoreApplication.translate 
     win_two.setWindowTitle(_translate("win_two", "Dialog")) 
     self.pushButton.setText(_translate("win_two", "OK")) 


if __name__ == "__main__": 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    win_two = QtWidgets.QDialog() 
    ui = Ui_win_two() 
    ui.setupUi(win_two) 
    win_two.show() 
    sys.exit(app.exec_()) 

back.py

import sys 
from PyQt5 import QtCore, QtGui, QtWidgets 
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QDialog 
from front_win_1 import Ui_win_one 
from front_win_2 import Ui_win_two 

class win_two(QDialog, Ui_win_two): 
    def __init__(self, parent=None): 
     super(win_two, self).__init__(parent) 
     self.setupUi(self) 
     self.pushButton.clicked.connect(self.vers_main) 

    def vers_main(self): 
     entry = self.lineEdit.text() 
     win_one().label.setText(entry) 

class win_one(QMainWindow, Ui_win_one): 
    def __init__(self, parent=None): 
     super(win_one, self).__init__(parent) 
     self.setupUi(dialog) 
     self.pushButton.clicked.connect(self.open_qdialog) 

    def open_qdialog(self): 
     self.dialog_win_2 = win_two() 
     self.dialog_win_2.show() 

if __name__ == "__main__": 
    app = QApplication(sys.argv) 
    dialog = QMainWindow() 
    prog = win_one(dialog) 
    dialog.showMaximized() 
    sys.exit(app.exec_()) 

谢谢哟ü

Answer 1

你的代码有一些不同之处：

1. 你不应该这样做dialog = QMainWindow()，因为它足以创建类win_one的目标，为此，你必须改变self.setupUi(dialog)到self.setupUi(self)。

2. 随着win_one().label.setText(entry)要创建一个新的对象，这是不必要的，除了你正在失去以前的对象，所以当你再次按下该窗口中的语句，QDialog没有打开，一个简单的办法就是把它作为父win_one to win_two并使用self.parent()函数来访问它。

上述所有在下面的部分实施：

class win_two(QDialog, Ui_win_two): 
    def __init__(self, parent=None): 
     super(win_two, self).__init__(parent) 
     self.setupUi(self) 
     self.pushButton.clicked.connect(self.vers_main) 

    def vers_main(self): 
     entry = self.lineEdit.text() 
     self.parent().label.setText(entry) 

class win_one(QMainWindow, Ui_win_one): 
    def __init__(self, parent=None): 
     super(win_one, self).__init__(parent) 
     self.setupUi(self) 
     self.pushButton.clicked.connect(self.open_qdialog) 

    def open_qdialog(self): 
     self.dialog_win_2 = win_two(self) 
     self.dialog_win_2.show() 

if __name__ == "__main__": 
    app = QApplication(sys.argv) 
    prog = win_one() 
    prog.showMaximized() 
    sys.exit(app.exec_()) 

注：我永远无法重现第一次的错误，只有第二个。