python之PySide2安装使用及QT Designer UI设计案例教程

pyside2 

>>> pip install pyside2

 QT Designer

>>> pip show pyside2

Location: c:\users\Administrator\appdata\roaming\python\python39\site-packages

文件位置
C:\Users\Administrator\AppData\Roaming\Python\Python39\site-packages\PySide2\designer.exe

Unable to lanch C: 

PySide2目录下复制uic.exe到新建的bin文件夹

C:\...\Python\Python39\site-packages\PySide2\bin\uic.exe

Ⅰ. Init 

from PySide2.QtWidgets import *

class Window:
   def __init__(self):
       self.win = QMainWindow()

if __name__ == '__main__':
   app = QApplication([])
   w = Window()
   w.win.show()
   app.exec_()

from PySide2.QtWidgets import *

if __name__ == '__main__':
   app = QApplication([])
   win = QMainWindow()
   win.show()
   app.exec_()

Ⅱ Example

from PySide2.QtWidgets import *

class Window:
   def __init__(self):
       self.win = QMainWindow()
       self.win.resize(500, 400)
       self.win.move(700, 210)
       self.win.setWindowTitle("测试窗口")

self.textEdit = QTextEdit(self.win)
       self.textEdit.move(50, 50)
       self.textEdit.resize(200, 300)
       self.textEdit.setPlaceholderText("请输入文本")

self.button = QPushButton("button", self.win)
       self.button.move(300, 100)
       self.button.clicked.connect(self.btnClick)

def btnClick(self):
       info = self.textEdit.toPlainText()   # 获取文本信息
       print(info)
       # print("button被点击")

if __name__ == '__main__':
   app = QApplication([])
   # win = QMainWindow()
   # win.show()
   w = Window()
   w.win.show()
   app.exec_()

QT Designer

1.自动生成代码

...
from PySide2.QtCore import QFile
from PySide2.QtUiTools import QUiLoader

...

if __name__ == "__main__":
   app = QApplication([])
   win = QMainWindow()
   w = Ui_Form()
   w.setupUi(win)
   win.show()
   app.exec_()

2.动态加载ui文件

from PySide2.QtWidgets import *
from PySide2.QtCore import QFile
from PySide2.QtUiTools import QUiLoader

class Window:
   def __init__(self):
       super(Window, self).__init__()

# 从文件中加载UI定义
       qfile = QFile("demo1.ui")
       qfile.open(QFile.ReadOnly)
       qfile.close()

# 从UI定义中动态创建一个相应的窗口对象, 将其内部文件定义为self.ui.button
       self.ui = QUiLoader().load(qfile)

self.ui.button.clicked.connect(self.btnClick)
       # self.button.clicked.connect(self.btnClick)

def btnClick(self):
       info = self.ui.textEdit.toPlainText()   # 获取文本信息
       # info = self.textEdit.toPlainText()
       print(info)

if __name__ == '__main__':
   app = QApplication([])
   w = Window()
   w.ui.show()
   # w.win.show()
   app.exec_()

来源：https://blog.csdn.net/weixin_56461542/article/details/119064314