PyQt5 设计师。使按钮事件起作用

Question

我正在尝试使用 Qt Designer 让按钮事件处理程序工作。

我在 Python 3.6 中使用 Anaconda-Spyder

出现表单，但按钮btn_browse 不起作用。行编辑框有一个光标，你可以在里面输入。

从 ui 自动生成的 Python 文件如下。它被称为file_reader.py

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(640, 320)
        self.btn_browse = QtWidgets.QPushButton(Dialog)
        self.btn_browse.setGeometry(QtCore.QRect(220, 50, 113, 32))
        self.btn_browse.setObjectName("btn_browse")
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(170, 120, 241, 131))
        self.lineEdit.setObjectName("lineEdit")
        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.btn_browse.setText(_translate("Dialog", "MyButton"))

我使用的代码（几乎来自 QtDesigner Docs 站点）是

from PyQt5 import QtGui
from PyQt5.QtWidgets import QDialog, QApplication
from file_reader import Ui_Dialog
class Dialog(QDialog):
    def __init__(self):
        super(Dialog, self).__init__()

        # Set up the user interface from Designer.
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)

        # Make some local modifications.
        self.ui.colorDepthCombo.addItem("2 colors (1 bit per pixel)")

        # Connect up the buttons.
        self.ui.btn_browse.clicked.connect(self.browse_folder)


    def browse_folder(self):
        #exit
        print("Hello")
        #self.textBrowser.clear() # In case there are any existing elements in the list
        directory = QtGui.QFileDialog.getExistingDirectory(self,"Pick a folder")
        # execute getExistingDirectory dialog and set the directory variable to be equal
        # to the user selected directory

        if directory: # if user didn't pick a directory don't continue
            for file_name in os.listdir(directory): # for all files, if any, in the directory
                self.listWidget.addItem(file_name)  # add file to the listWidget




import sys        
app = QApplication(sys.argv)
window = Dialog() #Also tried QDialog() here
ui = Ui_Dialog()
ui.setupUi(window)

window.show()
sys.exit(app.exec_())

我认为没有调用函数browse_folder。我认为问题可能是使用的 QDialog 类而不是 QMainForm。我

我正在努力。另外，我不确定 ui 转换器中的 x 开关是做什么的。

我在这里看了几个答案，看不出我做错了什么。

Answer 1

您的代码存在以下问题：

• 您创建的不是 Dialog 对象，而是一个填充有Ui_Dialog 的QDialog，它没有browse_folder 方法或连接。

• QFileDialog 是QtWidgets 的一部分，它不是QtGui 的一部分，您可能正在使用PyQt4 的示例。

• 我假设listWidget 来自Ui_Dialog，所以您必须通过ui 登录。

---

from PyQt5.QtWidgets import QDialog, QApplication, QFileDialog
from file_reader import Ui_Dialog
import os

class Dialog(QDialog):
    def __init__(self):
        super(Dialog, self).__init__()

        # Set up the user interface from Designer.
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)

        # Make some local modifications.
        self.ui.colorDepthCombo.addItem("2 colors (1 bit per pixel)")

        # Connect up the buttons.
        self.ui.btn_browse.clicked.connect(self.browse_folder)


    def browse_folder(self):
        #exit
        print("Hello")
        #self.textBrowser.clear() # In case there are any existing elements in the list
        directory = QFileDialog.getExistingDirectory(self,"Pick a folder")
        # execute getExistingDirectory dialog and set the directory variable to be equal
        # to the user selected directory

        if directory: # if user didn't pick a directory don't continue
            for file_name in os.listdir(directory): # for all files, if any, in the directory
                self.ui.listWidget.addItem(file_name)  # add file to the listWidget


import sys        
app = QApplication(sys.argv)
window = Dialog()
window.show()
sys.exit(app.exec_())