PyQt5 Python中的程序设置是如何保存的

Question

我有一个桌面程序，可以选择主题。如何保存用户的选择？

def Dark_Blue_Theme(self):
style = open('themes/darkblue.css' , 'r')
style = style.read()
self.setStyleSheet(style)
def Dark_Gray_Theme(self):
style = open('themes/darkgray.css' , 'r')
style = style.read()
self.setStyleSheet(style)
def Dark_Orange_Theme(self):
style = open('themes/darkorange.css' , 'r')
style = style.read()
self.setStyleSheet(style)
def QDark_Theme(self):
style = open('themes/qdark.css' , 'r')
style = style.read()
self.setStyleSheet(style)

Answer 1

逻辑是使用QSettings保存所选主题，然后在程序开始时使用它来加载主题：

import os
from PyQt5 import QtCore, QtGui, QtWidgets
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
THEME_DIR = os.path.join(CURRENT_DIR, "themes")
DEFAULT_THEME = "qdark"

class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self._theme = ""
self.restore_settings()
self.load_theme()
themes_menu = self.menuBar().addMenu(self.tr("Themes"))
it = QtCore.QDirIterator(THEME_DIR, ["*.css"])
group = QtWidgets.QActionGroup(self)
group.triggered.connect(self.handle_theme_triggered)
while it.hasNext():
it.next()
fi = it.fileInfo()
action = QtWidgets.QAction(fi.baseName(), self)
action.setCheckable(True)
group.addAction(action)
themes_menu.addAction(action)
if fi.baseName() == self.theme:
action.setChecked(True)
def handle_theme_triggered(self, action):
self._theme = action.text()
self.load_theme()
self.save_settings()
@property
def theme(self):
return self._theme
def save_settings(self):
settings = QtCore.QSettings()
settings.setValue("theme", self.theme)
def restore_settings(self):
settings = QtCore.QSettings()
theme = settings.value("theme")
if theme:
self._theme = theme
else:
self._theme = DEFAULT_THEME
self.save_settings()
def load_theme(self):
if self.theme:
theme_file = os.path.join(THEME_DIR, self.theme + ".css")
with open(theme_file) as f:
style = f.read()
self.setStyleSheet(style)
def closeEvent(self, event):
self.save_settings()
super().closeEvent(event)

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec())

├── main.py
└── themes
├── darkblue.css
├── darkgray.css
├── darkorange.css
└── qdark.css