我想在应用程序关闭时保存PyQt5设置

Question

我想在应用程序关闭时保存PyQt5设置。这是因为下次我再次运行它时，它将使用最终设置运行。所以，我写了这样的代码

这是一个主ui代码

# main_ui.py
import sys
from PyQt5.QtCore import QSettings
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QTabWidget, QVBoxLayout
from sub_ui import SubUI


class MainUI(QMainWindow):
    def __init__(self):
        super().__init__()
        self.settings = QSettings("A", "B")
        self.init_ui()

    def init_ui(self):
        tabs = QTabWidget()
        tabs.addTab(SubUI(), "SubUI")

        vlayout = QVBoxLayout()
        vlayout.addWidget(tabs)

        central_widget = QWidget()
        central_widget.setLayout(vlayout)
        self.setCentralWidget(central_widget)

        self.setWindowTitle("MainUI")
        if self.settings.contains("geometry"):
            print("LOAD: " + str(self.settings.value("geometry")))
            self.setGeometry(self.settings.value("geometry"))
        else:
            self.setGeometry(100, 100, 300, 300)
        self.show()

    def closeEvent(self, event):
        print("SAVE: " + str(self.settings.value("geometry")))
        self.settings.setValue("geometry", self.frameGeometry())


if __name__ == "__main__":
    APP = QApplication(sys.argv)
    ex = MainUI()
    sys.exit(APP.exec_())

这是一个子ui代码

# sub_ui.py
from PyQt5.QtCore import QSettings
from PyQt5.QtWidgets import QWidget, QHBoxLayout, QLabel, QLineEdit


class SubUI(QWidget):
    def __init__(self):
        super().__init__()
        self.settings = QSettings("A", "B")
        self.label = QLabel("test")
        self.lineedit = QLineEdit()
        self.init_ui()
        self.load_settings()

    def __del__(self):
        self.save_settings()

    def init_ui(self):
        hlayout = QHBoxLayout()
        hlayout.addWidget(self.label)
        hlayout.addWidget(self.lineedit)
        self.setLayout(hlayout)

    def save_settings(self):
        self.settings.setValue("label", self.lineedit.text())

    def load_settings(self):
        if self.settings.contains("label"):
            self.lineedit.setText(self.settings.value("label"))

有两个问题

一,。更改了框架几何体

我运行了这个程序，只需点击[X]图标即可关闭。但是“self.frameGeometry（）”值会更改。为什么会发生这种情况

==更多信息===

我只是运行了上面的程序三次，然后通过点击X来关闭它

LOAD: PyQt5.QtCore.QRect(1289, 370, 544, 604) 
SAVE: PyQt5.QtCore.QRect(1289, 370, 544, 604) 

LOAD: PyQt5.QtCore.QRect(1288, 339, 546, 636) 
SAVE: PyQt5.QtCore.QRect(1288, 339, 546, 636) 

LOAD: PyQt5.QtCore.QRect(1287, 308, 548, 668) 
SAVE: PyQt5.QtCore.QRect(1287, 308, 548, 668) 

frameGeometry值自行更改

这是我程序的原始问题

LOAD: PyQt5.QtCore.QRect(852, 217, 1108, 1050)
SAVE: PyQt5.QtCore.QRect(851, 186, 1110, 1082)

LOAD: PyQt5.QtCore.QRect(851, 186, 1110, 1082)
SAVE: PyQt5.QtCore.QRect(850, 155, 1112, 1114)

LOAD: PyQt5.QtCore.QRect(850, 155, 1112, 1114)
SAVE: PyQt5.QtCore.QRect(849, 124, 1114, 1146)

===

如何使frameGeometry值一致

二,。无法保存子ui设置。

当该程序关闭时，它返回错误

RuntimeError: wrapped C/C++ object of type QSettings has been deleted

因此，我无法保存这些值

我怎么能做我想做的事

Answer 1

1. 我不会在Linux上复制它。但是您可以使用^{}和^{}：

class MainUI(QMainWindow):
    def __init__(self):
        super().__init__()
        self.settings = QSettings("A", "B")
        self.init_ui()

    def init_ui(self):
        # ...
        self.setWindowTitle("MainUI")
        self.load_settings()
        self.show()

    def closeEvent(self, event):
        self.save_settings()
        super().closeEvent(event)

    def save_settings(self):
        self.settings.setValue("geometry", self.saveGeometry())

    def load_settings(self):
        if self.settings.contains("geometry"):
            self.restoreGeometry(self.settings.value("geometry"))
        else:
            self.setGeometry(100, 100, 300, 300)

1. 在_del _u方法中，依赖于SubUI作为子窗口小部件的对象已经被销毁，这在OP获得的错误消息中表示

   另一方面，只有窗口的closeEvent()方法（MainUI），因为它是唯一一个关闭的方法，因此保存QSettings中所有数据的适当方法实现了保存数据的通用方法

main_ui.py

class MainUI(QMainWindow):
    def __init__(self):
        super().__init__()
        self.settings = QSettings("A", "B")
        self.init_ui()

    def init_ui(self):
        # ...

    def closeEvent(self, event):
        for w in self.findChildren(QWidget) + [self]:
            if hasattr(w, "save_settings") and callable(w.save_settings):
                w.save_settings()
        super().closeEvent(event)

    def save_settings(self):
        self.settings.setValue("geometry", self.frameGeometry())

sub_ui.py

from PyQt5.QtCore import QSettings
from PyQt5.QtWidgets import QWidget, QHBoxLayout, QLabel, QLineEdit


class SubUI(QWidget):
    def __init__(self):
        super().__init__()
        self.settings = QSettings("A", "B")
        self.label = QLabel("test")
        self.lineedit = QLineEdit()
        self.init_ui()
        self.load_settings()

    def init_ui(self):
        hlayout = QHBoxLayout(self)
        hlayout.addWidget(self.label)
        hlayout.addWidget(self.lineedit)

    def save_settings(self):
        self.settings.setValue("label", self.lineedit.text())

    def load_settings(self):
        if self.settings.contains("label"):
            self.lineedit.setText(self.settings.value("label"))