PyQt5-如何在QMainWindow类中显示图像？

Question

I'm trying to display a picture in a QMainWindow class:

from PyQt5.QtWidgets import QLabel, QMainWindow, QApplication
from PyQt5.QtGui import QPixmap
import sys


class Menu(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("Title")
        label = QLabel(self)
        pixmap = QPixmap('capture.png')
        label.setPixmap(pixmap)
        self.resize(pixmap.width(), pixmap.height())
        self.show()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Menu()
    sys.exit(app.exec_())

But it doesn't show the image, just opens the window. I'm insisting on a QMainWindow class because I'm trying to write something like a paint app, so I'll be able to write a menu, and I'll be able to write on the picture.

Any suggestions would be appreciated.

Thanks.

Answer 1

QMainWindow.setCentralWidget(widget)

Sets the given widget to be the main window's central widget.

from PyQt5.QtWidgets import QLabel, QMainWindow, QApplication, QWidget, QVBoxLayout
from PyQt5.QtGui import QPixmap
import sys


class Menu(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("Title")

        self.central_widget = QWidget()               
        self.setCentralWidget(self.central_widget)    
        lay = QVBoxLayout(self.central_widget)

        label = QLabel(self)
        pixmap = QPixmap('logo.png')
        label.setPixmap(pixmap)
        self.resize(pixmap.width(), pixmap.height())

        lay.addWidget(label)
        self.show()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Menu()
    sys.exit(app.exec_())