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：
