即使窗口小部件关闭，如何在PyQt的QLineEdits中保存文本? [英] How to save text in QLineEdits in PyQt even if the Widget gets closed?

问题描述

您好，我已经使用PyQt为我的脚本制作了一个GUI，我有一些Line编辑和几个按钮

Hello I have made a GUI for my script using PyQt I have a couple of Line edit ands a couple of buttons

(.....)=(self.(.....).text())，我在脚本中使用该文本作为变量(但我认为这对问题不重要)我希望能够在QLineEdits中键入文本并将其保存，因此，下次我打开它时，文本仍将存在

(.....) = (self.(.....).text()) which I use that text for my script as a variable (but I don't think thats important to the question) I want to be able to type text into the QLineEdits and for it to save so next time I open it the text will still be there

我使用PyQt5，然后使用Py-installer将其制作为应用程序，因此我希望能够将文本保存在QLineEdits中，然后在关闭时将其保存在那里，以备下次打开时使用.>

I use PyQt5 then I use Py-installer to make it into an app So I want to be able to save the text inside the QLineEdits and then when It closes for it be be saved there for next time I open it>

Ps.我正在与其他人共享此应用，因此我希望它可以保存用户输入的内容(他们输入的是他们自定义的内容，例如(名称或类似名称)

Ps. I am sharing this app with other people So I want it to save what that user puts in (they are putting in stuff that is custom to them like for example (name or something like that)

这是我的pyqt5代码的示例:

Here is a sample of my pyqt5 code:

推荐答案

对于较旧的应用程序，它实现了保存小部件状态并恢复它们状态的功能.

For an older application, it implements the functions that saved the states of the widgets and restored them.

为了使其正常运行，该应用程序必须满足以下要求:

In order for it to work properly, the application must meet the following requirements:

• 您必须设置OrganizationName，OrganizationDomain和ApplicationName.

您要保存状态的每个小部件都必须具有objectName

Each widget that you want to save the state must have an objectName

要恢复状态时必须使用restore()，一个好的选择是在创建所有小部件之后.

You must use restore() when you want to restore the states, a good option is after creating all the widgets.

要保存状态时必须使用save()，一个好地方就是closeEvent().

You must use save() when you want to save the states, a good place would be closeEvent().

在下一部分中，我将显示一个示例:

In the next part I show an example:

import sys

from PyQt5 import QtWidgets, QtCore

# for PyQt4 change QtWidget to QtGui and PyQt5 to PyQt4


def restore(settings):
    finfo = QtCore.QFileInfo(settings.fileName())
    if finfo.exists() and finfo.isFile():
        for w in QtWidgets.qApp.allWidgets():
            mo = w.metaObject()
            if w.objectName() and not w.objectName().startswith("qt_"):
                settings.beginGroup(w.objectName())
                for i in range( mo.propertyCount(), mo.propertyOffset()-1, -1):
                    prop = mo.property(i)
                    if prop.isWritable():
                        name = prop.name()
                        val = settings.value(name, w.property(name))
                        if str(val).isdigit():
                            val = int(val)
                        w.setProperty(name, val)
                settings.endGroup()

def save(settings):
    for w in QtWidgets.qApp.allWidgets():
        mo = w.metaObject()
        if w.objectName() and not w.objectName().startswith("qt_"):
            settings.beginGroup(w.objectName())
            for i in range(mo.propertyCount()):
                prop = mo.property(i)
                name = prop.name()
                if prop.isWritable():
                    settings.setValue(name, w.property(name))
            settings.endGroup()


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setObjectName("widget")
        self.init_ui()
        self.settings = QtCore.QSettings()
        print(self.settings.fileName())
        restore(self.settings)

    def init_ui(self):
        lay = QtWidgets.QVBoxLayout(self)
        lineEdit1 = QtWidgets.QLabel("label")
        lineEdit1.setObjectName("label")
        lineEdit2 = QtWidgets.QLineEdit()
        lineEdit2.setObjectName("lineEdit2")
        combobox = QtWidgets.QComboBox()
        combobox.addItems(["1", "2", "3"])
        combobox.setObjectName("combo")
        lay.addWidget(lineEdit1)
        lay.addWidget(lineEdit2)
        lay.addWidget(combobox)

    def closeEvent(self, event):
        save(self.settings)
        super().closeEvent(event)


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    QtCore.QCoreApplication.setOrganizationName("Eyllanesc")
    QtCore.QCoreApplication.setOrganizationDomain("eyllanesc.com")
    QtCore.QCoreApplication.setApplicationName("MyApp")
    ex = Widget()
    ex.show()
    sys.exit(app.exec_())

---

更新:

在使用Qt Designer的情况下，不再需要放置objectsName，因为它们已经建立了，但是另一方面，提供Qt Designer的类不是小部件，而是一个类.负责填充窗口小部件，因此我们必须创建窗口小部件才能覆盖closeEvent方法，如下所示:

In the case that you use Qt Designer it is no longer necessary to place the objectsNames because they are already established, but on the other hand the class that provides Qt Designer is not a widget, but a class that is responsible for filling a widget, so we must create the widget to be able to overwrite the closeEvent method as shown below:

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        ...
    def retranslateUi(self, MainWindow):
        ...

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.setupUi(self)
        self.settings = QtCore.QSettings()
        restore(self.settings)

    def closeEvent(self, event):
        save(self.settings)
        super().closeEvent(event)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    QtCore.QCoreApplication.setOrganizationName("Eyllanesc")
    QtCore.QCoreApplication.setOrganizationDomain("eyllanesc.com")
    QtCore.QCoreApplication.setApplicationName("MyApp")
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

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