Python使用PyQt5库 一、Designer界面的使用

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台平：Mac OS
不介绍PyQt5的安装与Designer的安装，这里使用的是Qt 5.7自带的Designer界面编辑器
打开Designer界面后创建一个界面。

这里附上这个文件代码：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>336</width>
    <height>463</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QPushButton" name="Process_textLine">
    <property name="geometry">
     <rect>
      <x>70</x>
      <y>380</y>
      <width>181</width>
      <height>32</height>
     </rect>
    </property>
    <property name="text">
     <string>处理文件行内容无重复</string>
    </property>
   </widget>
   <widget class="QWidget" name="">
    <property name="geometry">
     <rect>
      <x>50</x>
      <y>11</y>
      <width>242</width>
      <height>162</height>
     </rect>
    </property>
    <layout class="QVBoxLayout" name="verticalLayout">
     <property name="spacing">
      <number>0</number>
     </property>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QLineEdit" name="PathSource">
         <property name="enabled">
          <bool>true</bool>
         </property>
         <property name="maximumSize">
          <size>
           <width>133</width>
           <height>21</height>
          </size>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QPushButton" name="SelectFileButton">
         <property name="text">
          <string>数据文件1</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout_2">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QLineEdit" name="PathSource_2">
         <property name="maximumSize">
          <size>
           <width>133</width>
           <height>21</height>
          </size>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QPushButton" name="SelectFileButton_2">
         <property name="text">
          <string>数据文件2</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout_3">
       <property name="spacing">
        <number>0</number>
       </property>
       <item>
        <widget class="QLineEdit" name="lineEdit">
         <property name="maximumSize">
          <size>
           <width>133</width>
           <height>21</height>
          </size>
         </property>
        </widget>
       </item>
       <item>
        <widget class="QPushButton" name="outputFile">
         <property name="text">
          <string>输出文件</string>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item>
      <widget class="QPushButton" name="screening">
       <property name="maximumSize">
        <size>
         <width>16777215</width>
         <height>40</height>
        </size>
       </property>
       <property name="text">
        <string>筛选</string>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
   <widget class="QWidget" name="">
    <property name="geometry">
     <rect>
      <x>100</x>
      <y>250</y>
      <width>131</width>
      <height>69</height>
     </rect>
    </property>
    <layout class="QVBoxLayout" name="verticalLayout_2">
     <item>
      <layout class="QHBoxLayout" name="horizontalLayout_4">
       <property name="spacing">
        <number>10</number>
       </property>
       <item>
        <widget class="QSpinBox" name="spinBox">
         <property name="maximum">
          <number>9</number>
         </property>
        </widget>
       </item>
       <item>
        <layout class="QHBoxLayout" name="horizontalLayout_5">
         <item>
          <widget class="QLabel" name="label">
           <property name="layoutDirection">
            <enum>Qt::LeftToRight</enum>
           </property>
           <property name="text">
            <string>To</string>
           </property>
           <property name="alignment">
            <set>Qt::AlignCenter</set>
           </property>
          </widget>
         </item>
        </layout>
       </item>
       <item>
        <widget class="QSpinBox" name="spinBox_2">
         <property name="maximum">
          <number>9</number>
         </property>
        </widget>
       </item>
      </layout>
     </item>
     <item>
      <widget class="QPushButton" name="Process_text4last">
       <property name="text">
        <string>处理</string>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
   <zorder>PathSource</zorder>
   <zorder>SelectFileButton</zorder>
   <zorder>SelectFileButton</zorder>
   <zorder>PathSource_2</zorder>
   <zorder>SelectFileButton_2</zorder>
   <zorder>screening</zorder>
   <zorder>Process_textLine</zorder>
   <zorder>lineEdit</zorder>
   <zorder>outputFile</zorder>
   <zorder>spinBox</zorder>
   <zorder>spinBox_2</zorder>
   <zorder>Process_text4last</zorder>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

安装PyQt5库后会有工具将.ui转换成python界面代码
pyuic5

使命令行进入到.ui存在的目录下
pyuic5 test.ui -o AppMain.py
这个命令会将test.ui界面文件生成 AppMain.py文件，AppMain.py文件里则是输出的Python语言pyqt5的相关代码类

附所输出的代码

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

# Form implementation generated from reading ui file 'test.ui'
#
# Created by: PyQt5 UI code generator 5.7
#
# 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(336, 463)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.Process_textLine = QtWidgets.QPushButton(self.centralwidget)
        self.Process_textLine.setGeometry(QtCore.QRect(70, 380, 181, 32))
        self.Process_textLine.setObjectName("Process_textLine")
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(50, 11, 242, 162))
        self.widget.setObjectName("widget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.widget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setSpacing(0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setSpacing(0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.PathSource = QtWidgets.QLineEdit(self.widget)
        self.PathSource.setEnabled(True)
        self.PathSource.setMaximumSize(QtCore.QSize(133, 21))
        self.PathSource.setObjectName("PathSource")
        self.horizontalLayout.addWidget(self.PathSource)
        self.SelectFileButton = QtWidgets.QPushButton(self.widget)
        self.SelectFileButton.setObjectName("SelectFileButton")
        self.horizontalLayout.addWidget(self.SelectFileButton)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_2.setSpacing(0)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.PathSource_2 = QtWidgets.QLineEdit(self.widget)
        self.PathSource_2.setMaximumSize(QtCore.QSize(133, 21))
        self.PathSource_2.setObjectName("PathSource_2")
        self.horizontalLayout_2.addWidget(self.PathSource_2)
        self.SelectFileButton_2 = QtWidgets.QPushButton(self.widget)
        self.SelectFileButton_2.setObjectName("SelectFileButton_2")
        self.horizontalLayout_2.addWidget(self.SelectFileButton_2)
        self.verticalLayout.addLayout(self.horizontalLayout_2)
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_3.setSpacing(0)
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        self.lineEdit = QtWidgets.QLineEdit(self.widget)
        self.lineEdit.setMaximumSize(QtCore.QSize(133, 21))
        self.lineEdit.setObjectName("lineEdit")
        self.horizontalLayout_3.addWidget(self.lineEdit)
        self.outputFile = QtWidgets.QPushButton(self.widget)
        self.outputFile.setObjectName("outputFile")
        self.horizontalLayout_3.addWidget(self.outputFile)
        self.verticalLayout.addLayout(self.horizontalLayout_3)
        self.screening = QtWidgets.QPushButton(self.widget)
        self.screening.setMaximumSize(QtCore.QSize(16777215, 40))
        self.screening.setObjectName("screening")
        self.verticalLayout.addWidget(self.screening)
        self.widget1 = QtWidgets.QWidget(self.centralwidget)
        self.widget1.setGeometry(QtCore.QRect(100, 250, 131, 69))
        self.widget1.setObjectName("widget1")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.widget1)
        self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.horizontalLayout_4 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_4.setSpacing(10)
        self.horizontalLayout_4.setObjectName("horizontalLayout_4")
        self.spinBox = QtWidgets.QSpinBox(self.widget1)
        self.spinBox.setMaximum(9)
        self.spinBox.setObjectName("spinBox")
        self.horizontalLayout_4.addWidget(self.spinBox)
        self.horizontalLayout_5 = QtWidgets.QHBoxLayout()
        self.horizontalLayout_5.setObjectName("horizontalLayout_5")
        self.label = QtWidgets.QLabel(self.widget1)
        self.label.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.horizontalLayout_5.addWidget(self.label)
        self.horizontalLayout_4.addLayout(self.horizontalLayout_5)
        self.spinBox_2 = QtWidgets.QSpinBox(self.widget1)
        self.spinBox_2.setMaximum(9)
        self.spinBox_2.setObjectName("spinBox_2")
        self.horizontalLayout_4.addWidget(self.spinBox_2)
        self.verticalLayout_2.addLayout(self.horizontalLayout_4)
        self.Process_text4last = QtWidgets.QPushButton(self.widget1)
        self.Process_text4last.setObjectName("Process_text4last")
        self.verticalLayout_2.addWidget(self.Process_text4last)
        self.PathSource.raise_()
        self.SelectFileButton.raise_()
        self.SelectFileButton.raise_()
        self.PathSource_2.raise_()
        self.SelectFileButton_2.raise_()
        self.screening.raise_()
        self.Process_textLine.raise_()
        self.lineEdit.raise_()
        self.outputFile.raise_()
        self.spinBox.raise_()
        self.spinBox_2.raise_()
        self.Process_text4last.raise_()
        MainWindow.setCentralWidget(self.centralwidget)
        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", "MainWindow"))
        self.Process_textLine.setText(_translate("MainWindow", "处理文件行内容无重复"))
        self.SelectFileButton.setText(_translate("MainWindow", "数据文件1"))
        self.SelectFileButton_2.setText(_translate("MainWindow", "数据文件2"))
        self.outputFile.setText(_translate("MainWindow", "输出文件"))
        self.screening.setText(_translate("MainWindow", "筛选"))
        self.label.setText(_translate("MainWindow", "To"))
        self.Process_text4last.setText(_translate("MainWindow", "处理"))

#END

现在测试一下这个界面

打开AppMain.py
在#END后添加以下代码

class MyWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(MyWindow, self).__init__()
        self.setupUi(self)

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    mywindow = MyWindow()
    mywindow.show()
    sys.exit(app.exec_())

我使用的是继承的方式，当然还有其他方式，这样的话可以使视图（界面）与功能区分开来，方便维护。

当然肯定是运行成功的！
我就不附图了，本人比较懒。