PyQt 输入对话框，意外类型

Posted 2023-02-17

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【中文标题】PyQt 输入对话框，意外类型【英文标题】：PyQt input dialog, unexpected type 【发布时间】：2018-03-23 11:47:52 【问题描述】：

这是我第一次使用 QInputDialog 并且我坚持使用这个示例。问题是当我按下 EditButton 并尝试打开 QInputDialog 时。出现“意外类型”错误：

"TypeError: QInputDialog.getText(QWidget, str, str, QLineEdit.EchoMode echo=QLine Edit.Normal, str text=QString(), Qt.WindowFlags flags=0, Qt.InputMethodHints inp utMethodHints=Qt.ImhNone) -> (str, bool): 参数 1 具有意外类型 'Ui_Dia 记录'"

我正在按照书中的示例进行操作，但它似乎不起作用。有人可以解释一下吗？

from PyQt5 import QtCore, QtGui, QtWidgets 
from PyQt5.QtWidgets import QInputDialog
class Ui_Dialog(object):
    def Addlist(self):
        self.listWidget.addItem(self.lineEdit.text())
        self.lineEdit.setText('')
        self.lineEdit.setFocus()
    def Editlist(self):
        row = self.listWidget.currentRow()
        newtext, ok = QInputDialog.getText(self, "Enter new text", "Enter new text")   
        if ok and (len(newtext) !=0):
            self.listWidget.takeItem(self.listWidget.currentRow())
            self.listWidget.insertItem(row, QListWidgetItem(newtext))      
    def Delete(self):
        self.listWidget.takeItem(self.listWidget.currentRow())
    def Deleteall(self):
        self.listWidget.clear()
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(570, 318)
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(30, 20, 101, 21))
        self.label.setObjectName("label")
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(130, 20, 113, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.AddButton = QtWidgets.QPushButton(Dialog)
        self.AddButton.setGeometry(QtCore.QRect(150, 80, 75, 23))
        self.AddButton.setObjectName("AddButton")
        self.listWidget = QtWidgets.QListWidget(Dialog)
        self.listWidget.setGeometry(QtCore.QRect(290, 20, 256, 271))
        self.listWidget.setObjectName("listWidget")
        self.EditButton = QtWidgets.QPushButton(Dialog)
        self.EditButton.setGeometry(QtCore.QRect(150, 120, 75, 23))
        self.EditButton.setObjectName("EditButton")
        self.DeteleButton = QtWidgets.QPushButton(Dialog)
        self.DeteleButton.setGeometry(QtCore.QRect(150, 160, 75, 23))
        self.DeteleButton.setObjectName("DeteleButton")
        self.DeleteAllButton = QtWidgets.QPushButton(Dialog)
        self.DeleteAllButton.setGeometry(QtCore.QRect(150, 200, 75, 23))
        self.DeleteAllButton.setObjectName("DeleteAllButton")
        self.listWidget.addItem('Pizza')
        self.listWidget.addItem('Pasta')
        self.listWidget.addItem('Burrito')
        self.listWidget.addItem('Hamburger')
        self.AddButton.clicked.connect(self.Addlist)
        self.EditButton.clicked.connect(self.Editlist)
        self.DeteleButton.clicked.connect(self.Delete)
        self.DeleteAllButton.clicked.connect(self.Deleteall)
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)
    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.label.setText(_translate("Dialog", "Enter Text"))
        self.AddButton.setText(_translate("Dialog", "Add"))
        self.EditButton.setText(_translate("Dialog", "Edit"))
        self.DeteleButton.setText(_translate("Dialog", "Delete"))
        self.DeleteAllButton.setText(_translate("Dialog", "Delete All"))
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

【问题讨论】：

报错说明这行代码有问题newtext, ok = QInputDialog.getText(self, "Enter new text", "Enter new text") 具体self的使用是Ui_Dialog类型为QWidget? 我猜你的类应该是QWidget 的子类而不是object 你能举个例子给我解释一下吗？ 【参考方案1】：

问题在于 QFileDialog 将 QWidget 项作为其父项作为其第一个参数。当你提供self 时，你提供给它的是一个继承自对象而不是QWidget 的Ui_Dialog 类的实例。

对此有几种不同的修复方法，其中涉及的代码更改很少：

def setupUi(self, Dialog):
    self.dialog = Dialog
    # your code here

def Editlist(self):
    row = self.listWidget.currentRow()
    newtext, ok = QInputDialog.getText(self.dialog, "Enter new text", "Enter new text")
    # your code heret

【讨论】：

【参考方案2】：

试试看：

from PyQt5 import QtCore, QtGui, QtWidgets 
from PyQt5.QtWidgets import QInputDialog,       QWidget, QListWidgetItem   # ++

class Ui_Dialog(QWidget):                                 # - object  + QWidget

    def Addlist(self):
        self.listWidget.addItem(self.lineEdit.text())
        self.lineEdit.setText('')
        self.lineEdit.setFocus()

    def Editlist(self):
        row = self.listWidget.currentRow()
        newtext, ok = QInputDialog.getText(self, "Enter new text", "Enter new text")  

        if ok and (len(newtext) !=0):
            self.listWidget.takeItem(self.listWidget.currentRow())
            self.listWidget.insertItem(row, QListWidgetItem(newtext)) 

    def Delete(self):
        self.listWidget.takeItem(self.listWidget.currentRow())

    def Deleteall(self):
        self.listWidget.clear()

    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(570, 318)
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(30, 20, 101, 21))
        self.label.setObjectName("label")
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(130, 20, 113, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.AddButton = QtWidgets.QPushButton(Dialog)
        self.AddButton.setGeometry(QtCore.QRect(150, 80, 75, 23))
        self.AddButton.setObjectName("AddButton")
        self.listWidget = QtWidgets.QListWidget(Dialog)
        self.listWidget.setGeometry(QtCore.QRect(290, 20, 256, 271))
        self.listWidget.setObjectName("listWidget")
        self.EditButton = QtWidgets.QPushButton(Dialog)
        self.EditButton.setGeometry(QtCore.QRect(150, 120, 75, 23))
        self.EditButton.setObjectName("EditButton")
        self.DeteleButton = QtWidgets.QPushButton(Dialog)
        self.DeteleButton.setGeometry(QtCore.QRect(150, 160, 75, 23))
        self.DeteleButton.setObjectName("DeteleButton")
        self.DeleteAllButton = QtWidgets.QPushButton(Dialog)
        self.DeleteAllButton.setGeometry(QtCore.QRect(150, 200, 75, 23))
        self.DeleteAllButton.setObjectName("DeleteAllButton")
        self.listWidget.addItem('Pizza')
        self.listWidget.addItem('Pasta')
        self.listWidget.addItem('Burrito')
        self.listWidget.addItem('Hamburger')
        self.AddButton.clicked.connect(self.Addlist)
        self.EditButton.clicked.connect(self.Editlist)
        self.DeteleButton.clicked.connect(self.Delete)
        self.DeleteAllButton.clicked.connect(self.Deleteall)
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.label.setText(_translate("Dialog", "Enter Text"))
        self.AddButton.setText(_translate("Dialog", "Add"))
        self.EditButton.setText(_translate("Dialog", "Edit"))
        self.DeteleButton.setText(_translate("Dialog", "Delete"))
        self.DeleteAllButton.setText(_translate("Dialog", "Delete All"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

【讨论】：

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