stay PyQt5 in ,QWidgets The module provides a set of UI Element to create a classic desktop user interface . Widgets can display data and status information , Receive user input , And provide containers for other widgets that should be grouped together . A widget that is not embedded in the parent control is called a window . Contains the parent widget for each child control . So first , You start writing a code for your window window=QtWidgets.QWidget()
(QWidget Class is the base class for all user interface objects ). After creating the window , Need for UI Window setup layout .Qt There are many classes for layout in , But the most common is QVBoxLayout( Arrange widgets vertically ) and {}( Arrange widgets horizontally ), Many times they are used to make custom layouts . Now your QVBoxLayout Create as
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( Please note that ,vbox Just a variable name )text_1=QtWidgets.QLineEdit()
text_2=QtWidgets.QLineEdit()
run_btn=QtWidgets.QPushButton("run")
text_3=QtWidgets.QLineEdit()
be careful , stay QPushButton in , We can take the name of the button as its parameter ( In this case, yes ex-run). Now is the time for events and signals .
To connect a button to a function , Let's write down btn.clicked.connect(function_name) here btn It's our button . Note that the function name here has no parentheses , That means we didn't call the function , Just connect the button to the function ( When the user clicks the button , The function will be executed )run_btn=QtWidgets.QPushButton("run")
def main():
data_1=text_1.text()
data_2=text_2.text()
text_3.setText(str(int(data_1)+int(data_2)))
Now in our main In function , Let's start with text_1 and {} collecting data ( There is one text() method ,QLineEdit from QLineEdit get data , As str). therefore ,main Functions accept at the same time {} and {} And add them ( If the value entered cannot be converted to an integer , An error is raised ) And pass setText() Method to set the value to text_3. stay
Now you must package the widget into the one we created earlier vbox in vbox.addWidget(text_1)
vbox.addWidget(text_2)
vbox.addWidget(run_btn)
vbox.addWidget(text_3)
Now set the layout of the window to window.setLayout(vbox)
Show the window as window.show()
Up to now , One thing is missing , That's the line app=QtWidgets.QApplication(sys.argv)
This line is required , Because every PyQt5 Every application must create one application object .sys.argv Parameters are a list of parameters on the command line .
Now we must create the main loop of the application . Event handling starts at this point .app.exec_() Method to run our application , Then provide a clean exit . stay
Put all this together now ：import sys
from PyQt5 import QtWidgets
app=QtWidgets.QApplication(sys.argv)
window=QtWidgets.QWidget()
vbox=QtWidgets.QVBoxLayout()
text_1=QtWidgets.QLineEdit()
text_2=QtWidgets.QLineEdit()
run_btn=QtWidgets.QPushButton("run")
text_3=QtWidgets.QLineEdit()
def main():
data_1=text_1.text()
data_2=text_2.text()
text_3.setText(str(int(data_1)+int(data_2)))
run_btn.clicked.connect(main)
vbox.addWidget(text_1)
vbox.addWidget(text_2)
vbox.addWidget(run_btn)
vbox.addWidget(text_3)
window.setLayout(vbox)
window.show()
sys.exit(app.exec_())
This will make UI The window is shown below ：
I hope it helps .
If you have any questions, please comment .
Coding happiness ! stay
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