How to Create a MessageBox in Python Using Qt Designer?

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To create a MessageBox in Python using Qt Designer, follow these steps:

  1. Open Qt Designer and create a new project.
  2. Drag and drop a “Dialog” widget onto the design area.
  3. Drag and drop a “PushButton” onto the Dialog widget.
  4. Select the PushButton and go to the “Signals/Slots Editor”.
  5. Double click the “clicked()” signal to create a new slot.
  6. In the “Slot Editor” that pops up, give the slot a name, such as “showMessageBox”.
  7. Click the “OK” button to close the “Slot Editor”.
  8. With the PushButton still selected, go to the “Property Editor”.
  9. Under “Object Name”, give the PushButton a name, such as “showMsgBoxBtn”.
  10. Save the .ui file.

Now, in your Python code, you can use the following code to create a QMessageBox:

from PyQt5 import QtWidgets, uic

class MyDialog(QtWidgets.QDialog):
    def __init__(self):
        super(MyDialog, self).__init__()
        uic.loadUi('mydialog.ui', self)
        self.showMsgBoxBtn.clicked.connect(self.showMessageBox)

    def showMessageBox(self):
        msgBox = QtWidgets.QMessageBox()
        msgBox.setText("Hello, World!")
        msgBox.exec_()

In this code, we first load the UI file using uic.loadUi(). We then connect the clicked() signal of the PushButton to the showMessageBox() slot. In the showMessageBox() slot, we create a QMessageBox, set the message text, and then call exec_() to show the message box.

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