通过QTDesigner构建实现含有打开文件Button的窗体

先放代码部分
第一段代码是在qtdesigner通过拖拽的方式构建UI文件，当然对于button也需要建立信号与槽的联系，pushButton的点击事件连接到openImage(),后面我会定义这个函数。pushBotton_2的点击事件会连接到runModel()这个函数（也是自定义的）

保存为.ui文件

.ui文件通过扩展工具pyuic，转化为.py文件，
如下

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'mainwindow.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(100, 330, 93, 28))
        self.pushButton.setObjectName("pushButton")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(20, 40, 72, 15))
        self.label.setObjectName("label")
        self.textEdit = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit.setGeometry(QtCore.QRect(20, 70, 341, 211))
        self.textEdit.setObjectName("textEdit")
        self.textEdit_2 = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit_2.setGeometry(QtCore.QRect(430, 70, 341, 211))
        self.textEdit_2.setObjectName("textEdit_2")
        self.textEdit_3 = QtWidgets.QTextEdit(self.centralwidget)
        self.textEdit_3.setGeometry(QtCore.QRect(430, 330, 341, 211))
        self.textEdit_3.setObjectName("textEdit_3")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(100, 400, 93, 28))
        self.pushButton_2.setObjectName("pushButton_2")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(430, 40, 72, 15))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(430, 300, 101, 16))
        self.label_3.setObjectName("label_3")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(MainWindow.openImage)
        self.pushButton_2.clicked.connect(MainWindow.runModel)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.label.setText(_translate("MainWindow", "源文件："))
        self.pushButton_2.setText(_translate("MainWindow", "PushButton"))
        self.label_2.setText(_translate("MainWindow", "目标文件："))
        self.label_3.setText(_translate("MainWindow", "输出详细信息："))

因为后期需要对ui文件进行调整，会覆盖之前的.ui文件，所以我选择再写一个.py文件，然后继承Ui_MainWindow类。
代码如下

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# author: feifan time:2019/5/21
import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QFileDialog
from PyQt5.QtGui import *
from mainwindow import Ui_MainWindow


class DetailUI(Ui_MainWindow,QMainWindow):
    def __init__(self):
        super(DetailUI, self).__init__()
        self.setupUi(self)
        self.setWindowTitle('银行卡识别')


    def openImage(self):
        try:
            fname , _ = QFileDialog.getOpenFileName(self, 'open file', '/',"Image files (*.jpg *.gif *.png)")
            self.textEdit.setPixmap(QPixmap(fname))
        except:
            self.textEdit.setText("打开文件失败，可能是文件内型错误")

    def runModel(self):
        pass
if __name__ == "__main__":
    app = QApplication(sys.argv)
    ex = DetailUI()
    ex.show()
    sys.exit(app.exec_())

点击pushButton，会触发打开图片型文件这一事件，如图：