usage habit

variable naming

When using components, it is best to add a suffix to each component individually
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Basic use of each component

button

class Test_window(QtWidgets.QMainWindow,Test_UI.Ui_MainWindow):
    def __init__(self,parent=None):
        super(Test_window,self).__init__(parent)
        self.setupUi(self)

        self.pushButton_OpenFile.clicked.connect(self.button_test)

    def button_test(self):
        print(self.pushButton_OpenFile.isChecked())

Label

References: PyQt5 label centered image display (QLabel)

Common small functions

open a file or folder

basic method

1. Open a single file

QFileDialog.getOpenFileName()

2. Multiple files open

QFileDialog.getOpenFileNames()

3. Folder selection

QFileDialog.getExistingDirectory()

4. File saving

QFileDialog.getSaveFileName()

Example:

from PyQt5 import QtWidgets,QtCore
from PyQt5.QtWidgets import QMainWindow,QApplication
from PyQt5.QtWidgets import QFileDialog
import sys

import Test_UI

class Test_window(QtWidgets.QMainWindow,Test_UI.Ui_MainWindow):
    def __init__(self,parent=None):
        super(Test_window,self).__init__(parent)
        self.setupUi(self)

        self.pushButton_OpenFile.clicked.connect(self.msg)

    def msg(self):
        directory1 = QFileDialog.getExistingDirectory(self,
                                                      "选取文件夹",
                                                      "./")  # 起始路径
        print(directory1)

        fileName1, filetype = QFileDialog.getOpenFileName(self,
                                                          "选取文件",
                                                          "./",
                                                          "All Files (*);;Text Files (*.txt)")  # 设置文件扩展名过滤,注意用双分号间隔
        print(fileName1, filetype)

        files, ok1 = QFileDialog.getOpenFileNames(self,
                                                  "多文件选择",
                                                  "./",
                                                  "All Files (*);;Text Files (*.txt)")
        print(files, ok1)

        fileName2, ok2 = QFileDialog.getSaveFileName(self,
                                                     "文件保存",
                                                     "./",
                                                     "All Files (*);;Text Files (*.txt)")



if __name__ == '__main__':
    app = QApplication(sys.argv)
    mytest = Test_window()
    mytest.show()
    app.exec_()

Open the file and display the image

Import the key header file QtGui

from PyQt5 import QtWidgets,QtCore,QtGui

class Test_window(QtWidgets.QMainWindow,Test_UI.Ui_MainWindow):
    def __init__(self,parent=None):
        super(Test_window,self).__init__(parent)
        self.setupUi(self)

        self.pushButton_OpenFile.clicked.connect(self.openimage)

    def openimage(self):
        imgName, imgType = QFileDialog.getOpenFileName(self, "打开图片", "", "*.jpg;;*.png;;All Files(*)")
        jpg = QtGui.QPixmap(imgName).scaled(self.label_ShowImg.width(), self.label_ShowImg.height())
        self.label_ShowImg.setPixmap(jpg)

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Insert background image qcc

Create a .qrc file

<!DOCTYPE RCC>
<RCC version="1.0">
<qresource prefix="/">
    <file>images/logo.png</file>

</qresource>
</RCC>

Then use PTQCC conversion, you can use these pictures directly in QtDesigner
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Use records of commonly used components and small methods in Ptqt5 (opening files, displaying pictures, adding pictures to the background)