使用 Qsettings 恢复 QCheckBox

Question

有QCheckBox想在关闭文件后保存和恢复checkstate。

尝试了以下，但它确实不起作用！

代码：

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class SecondOrder(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(SecondOrder, self).__init__(parent)
        self.setFont(QtGui.QFont("Helvetica", 8, QtGui.QFont.Normal, italic=False))

        curvaturelabel = QtWidgets.QLabel('Nominal curvature')
        stiffnesslabel = QtWidgets.QLabel('Nominal stiffness')
        simcurvaturelabel = QtWidgets.QLabel('Simplified nominal curvature')   

        self.curvaturecheck = QtWidgets.QCheckBox()
        self.stiffnesscheck = QtWidgets.QCheckBox()
        self.simcurvaturecheck = QtWidgets.QCheckBox()

        self.clay = QtWidgets.QVBoxLayout()
        self.clay.addWidget(curvaturelabel)
        self.clay.addWidget(stiffnesslabel)
        self.clay.addWidget(simcurvaturelabel)

        self.dlay = QtWidgets.QVBoxLayout()
        self.dlay.addWidget(self.curvaturecheck)
        self.dlay.addWidget(self.stiffnesscheck)
        self.dlay.addWidget(self.simcurvaturecheck)

        grid = QtWidgets.QGridLayout(self)
        grid.addLayout(self.dlay, 0, 0)
        grid.addLayout(self.clay, 0, 1)

        Secondorder_Group = QtWidgets.QGroupBox(self)
        Secondorder_Group.setTitle("&Second order analysis method")
        Secondorder_Group.setLayout(grid)

        self.elay = QtWidgets.QHBoxLayout(self)
        self.elay.addWidget(Secondorder_Group)     
        self.elay.setSizeConstraint(self.elay.SetFixedSize)

        group = QtWidgets.QButtonGroup(self) 
        group.addButton(self.curvaturecheck) 
        group.addButton(self.stiffnesscheck) 
        group.addButton(self.simcurvaturecheck)

        self.readSettings()

        self.curvaturecheck.stateChanged.connect(lambda: self.writeSettings())
        self.stiffnesscheck.stateChanged.connect(lambda: self.writeSettings())
        self.simcurvaturecheck.stateChanged.connect(lambda: self.writeSettings())

    def readSettings(self):
        settings = QtCore.QSettings('file.ini')
        settings.beginGroup("QCheckBox")
        self.curvaturecheck.setCheckState(settings.value("A", QtCore.Qt.Checked, bool))
        self.stiffnesscheck.setCheckState(settings.value("B", False, bool))
        self.simcurvaturecheck.setCheckState(settings.value("C", False, bool))
        settings.endGroup()

    def writeSettings(self):
        settings = QtCore.QSettings('file.ini')
        settings.beginGroup("QCheckBox")
        settings.setValue("A", self.curvaturecheck.isCheckable())
        settings.setValue("B", self.stiffnesscheck.isCheckable())
        settings.setValue("C", self.simcurvaturecheck.isCheckable())
        settings.endGroup()


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

注意下面的代码都试过了，确实保存和恢复了但是混了多次校验？希望能够检查一次并恢复。

    settings.setValue("A", self.curvaturecheck.isChecked())
    settings.setValue("B", self.stiffnesscheck.isChecked())
    settings.setValue("C", self.simcurvaturecheck.isChecked())

Answer 1

https://doc.qt.io/qt-5/qbuttongroup.html#details

QButtonGroup provides an abstract container into which button widgets can be placed.. It does not provide a visual representation of this container (see QGroupBox for a container widget), but instead manages the states of each of the buttons in the group.

setValue() 每个复选框都可以切换另一个。

但真正的问题是isCheckable()（意味着可以检查或不检查）。可能您想使用 isChecked()（值设置为 true）。

编辑。您可以尝试通过 setChecked().

设置状态

或者，如果您想支持部分检查，请使用 setCheckState()（如您所用）和 checkState() 来获取信息。

Answer 2

如果您要保存类型 T 数据，那么您必须使用使用类型 T 的函数，在您的情况下，您使用 isChecked() 保存一个布尔值，并且您想要使用函数 setCheckState()，该函数使用一个Qt::CheckState 导致错误的类型。

考虑到以上有2个解决方案：

使用布尔值：

def readSettings(self):
    settings = QtCore.QSettings("file.ini")
    settings.beginGroup("QCheckBox")
    self.curvaturecheck.setChecked(settings.value("A", True, bool))
    self.stiffnesscheck.setChecked(settings.value("B", False, bool))
    self.simcurvaturecheck.setChecked(settings.value("C", False, bool))
    settings.endGroup()

def writeSettings(self):
    settings = QtCore.QSettings("file.ini")
    settings.beginGroup("QCheckBox")
    settings.setValue("A", self.curvaturecheck.isChecked())
    settings.setValue("B", self.stiffnesscheck.isChecked())
    settings.setValue("C", self.simcurvaturecheck.isChecked())
    settings.endGroup()

使用Qt::CheckState

def readSettings(self):
    settings = QtCore.QSettings("file.ini")
    settings.beginGroup("QCheckBox")
    self.curvaturecheck.setCheckState(
        settings.value("A", QtCore.Qt.Checked, QtCore.Qt.CheckState)
    )
    self.stiffnesscheck.setCheckState(
        settings.value("B", QtCore.Qt.Unchecked, QtCore.Qt.CheckState)
    )
    self.simcurvaturecheck.setCheckState(
        settings.value("C", QtCore.Qt.Unchecked, QtCore.Qt.CheckState)
    )
    settings.endGroup()

def writeSettings(self):
    settings = QtCore.QSettings("file.ini")
    settings.beginGroup("QCheckBox")
    settings.setValue("A", self.curvaturecheck.checkState())
    settings.setValue("B", self.stiffnesscheck.checkState())
    settings.setValue("C", self.simcurvaturecheck.checkState())
    settings.endGroup()

建议您删除位于settings.fileName().

的.ini文件

另一方面，没有必要使用 lambda 函数，将您的代码更改为：

self.curvaturecheck.stateChanged.connect(self.writeSettings)
self.stiffnesscheck.stateChanged.connect(self.writeSettings)
self.simcurvaturecheck.stateChanged.connect(self.writeSettings)

使用 Qsettings 恢复 QCheckBox

Restoring QCheckBox with Qsettings

python

python-3.x

qsettings

qcheckbox

pyqt5