setSizeHint() 不适用于更改 QListWidget

如何解决setSizeHint() 不适用于更改 QListWidget

这是我更改列表中项目高度的代码

ui.symbolsList.insertItem(ui.symbolsList.count(),ui.addSymbolText.text())
count = ui.symbolsList.count()
for i in range(count):
    item = ui.symbolsList.item(i)
    item.setSizeHint(QSize(item.sizeHint().width(),60))

这不会改变 QListWidget 中项目的高度。我还尝试首先使用自定义高度创建项目，然后将该项目添加到列表中。我还需要做什么？

以下是工作代码：

from PyQt5 import QtCore,QtGui,QtWidgets
from PyQt5.QtCore import QSize


class Ui_MainWindow(object):
    def submit(self):
        self.listWidget.insertItem(self.listWidget.count(),self.lineEdit.text())
        count = self.listWidget.count()
        for i in range(count):
            item = self.listWidget.item(i)
            item.setSizeHint(QSize(item.sizeHint().width(),60))
                
        self.lineEdit.setText("")

    def setupUi(self,MainWindow):
        MainWindow.setobjectName("MainWindow")
        MainWindow.resize(800,600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setobjectName("centralwidget")
        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setGeometry(QtCore.QRect(170,110,256,192))
        self.listWidget.setobjectName("listWidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(170,70,113,20))
        self.lineEdit.setobjectName("lineEdit")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(300,75,23))
        self.pushButton.setobjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0,800,21))
        self.menubar.setobjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setobjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
    
        self.pushButton.clicked.connect(self.submit)
    
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    
    def retranslateUi(self,MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setwindowTitle(_translate("MainWindow","MainWindow"))
        self.pushButton.setText(_translate("MainWindow","PushButton"))

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

解决方法

问题是默认的 sizeHint() 是 QSize(-1,-1)，这是无效的，所以在创建宽度为 -1 的新 QSize 时会使其无效，导致在绘制项目时不使用它。解决方法不是使用默认的sizeHint()的宽度而是将宽度设置为0：

item.setSizeHint(QSize(0,60))