PyQt5 QTreeView有问题，不显示文件夹

Question

我正在尝试用Python构建简单的FTP客户端，对于GUI，我使用PyQt5。问题是当我运行QTreeView程序时并没有显示目录，它只是一个空白的表面。如何编写此代码以显示文件夹以及如何与下面的此listView链接？我在谷歌上看到过，但我无法解决这个问题。你知道吗

这是我的窗户

我想要这样的东西

代码：

from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(852, 637)
        MainWindow.setAnimated(True)
        MainWindow.setDocumentMode(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.connectButton = QtWidgets.QPushButton(self.centralwidget)
        self.connectButton.setGeometry(QtCore.QRect(710, 20, 111, 21))
        self.connectButton.setObjectName("connectButton")
        self.usernameEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.usernameEdit.setGeometry(QtCore.QRect(180, 20, 161, 20))
        self.usernameEdit.setObjectName("usernameEdit")
        self.passEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.passEdit.setGeometry(QtCore.QRect(350, 20, 161, 20))
        self.passEdit.setObjectName("passEdit")
        self.portEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.portEdit.setGeometry(QtCore.QRect(520, 20, 161, 20))
        self.portEdit.setReadOnly(False)
        self.portEdit.setObjectName("portEdit")
        self.hostEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.hostEdit.setGeometry(QtCore.QRect(10, 20, 161, 20))
        self.hostEdit.setText("")
        self.hostEdit.setObjectName("hostEdit")
        self.treeView = QtWidgets.QTreeView(self.centralwidget)
        self.treeView.setGeometry(QtCore.QRect(10, 60, 401, 281))
        self.treeView.setObjectName("treeView")
        self.treeView_2 = QtWidgets.QTreeView(self.centralwidget)
        self.treeView_2.setGeometry(QtCore.QRect(420, 60, 401, 281))
        self.treeView_2.setObjectName("treeView_2")
        self.listView = QtWidgets.QListView(self.centralwidget)
        self.listView.setGeometry(QtCore.QRect(10, 350, 401, 192))
        self.listView.setObjectName("listView")
        self.listView_2 = QtWidgets.QListView(self.centralwidget)
        self.listView_2.setEnabled(True)
        self.listView_2.setGeometry(QtCore.QRect(420, 350, 401, 192))
        self.listView_2.setObjectName("listView_2")
        self.uploadButton = QtWidgets.QPushButton(self.centralwidget)
        self.uploadButton.setGeometry(QtCore.QRect(10, 550, 401, 41))
        self.uploadButton.setObjectName("uploadButton")
        self.downloadButton = QtWidgets.QPushButton(self.centralwidget)
        self.downloadButton.setGeometry(QtCore.QRect(420, 550, 401, 41))
        self.downloadButton.setObjectName("downloadButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 852, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "My FTP Client"))
        self.connectButton.setText(_translate("MainWindow", "Quickconnect"))
        self.usernameEdit.setPlaceholderText(_translate("MainWindow", "Username"))
        self.passEdit.setPlaceholderText(_translate("MainWindow", "Password"))
        self.portEdit.setPlaceholderText(_translate("MainWindow", "Port"))
        self.hostEdit.setPlaceholderText(_translate("MainWindow", "Host"))
        self.uploadButton.setText(_translate("MainWindow", "Upload"))
        self.downloadButton.setText(_translate("MainWindow", "Download"))


    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_())

Answer 1

如果QTreeView没有告诉您要显示什么，您希望它如何显示？，a QTreeView它所做的是显示某个模型的内容，在您的情况下，应该使用a QFileSystemModel。你知道吗

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    ...

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        model = QtWidgets.QFileSystemModel(self)
        model.setRootPath(QtCore.QDir.rootPath())
        self.treeView.setModel(model)
        self.treeView.expandAll()
        self.treeView.setRootIndex(model.index(QtCore.QDir.rootPath()))

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