Python PyQt5实现一个简单的图像查看器（菜单+；图像）

我是PyQt的初学者。我想创建一个带有简单菜单和标签的窗口。 我搜索了如何创建菜单和如何在标签中显示图像，但无法将这两个东西结合起来

菜单代码（图像不显示）：

不带显示图像的菜单的代码：

import os
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
import cv2


class ImageViewer(QWidget):

    def __init__(self):
        QWidget.__init__(self)
        self.setup_ui()

    def setup_ui(self):
        self.image_label = QLabel()
        self.image_label.setPixmap(QPixmap('./default.png'))

        self.main_layout = QVBoxLayout()  # adding widgets to layot
        self.main_layout.addWidget(self.image_label)

        self.setLayout(self.main_layout)  # set layot


if __name__ == "__main__":
    app = QApplication(sys.argv)
    viewer = ImageViewer()
    viewer.show()
app.exec_()

---

如何组合这两件事？？？

将self添加到所有label变量中，它就可以工作了

import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
import cv2


class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.label = QLabel(self)
        pixmap = QPixmap('./liver.bmp')
        self.label.setPixmap(pixmap)
        self.resize(pixmap.width(), pixmap.height())
        # Create new action
        openAction = QAction(QIcon('open.png'), '&Open', self)
        openAction.setShortcut('Ctrl+O')
        openAction.setStatusTip('Open document')
        openAction.triggered.connect(self.openCall)

        # Create menu bar and add action
        menuBar = self.menuBar()
        fileMenu = menuBar.addMenu('&File')
        fileMenu.addAction(openAction)


    def openCall(self):
        pixmap = QPixmap('./default.png')
        self.label.setPixmap(pixmap)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit( app.exec_() )

---

没用了…谢谢你！问题在于标签的大小。它太小了，没看见，我太傻了。。。

import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
import cv2


class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.label = QLabel(self)
        pixmap = QPixmap('./liver.bmp')
        self.label.setPixmap(pixmap)
        self.resize(pixmap.width(), pixmap.height())
        # Create new action
        openAction = QAction(QIcon('open.png'), '&Open', self)
        openAction.setShortcut('Ctrl+O')
        openAction.setStatusTip('Open document')
        openAction.triggered.connect(self.openCall)

        # Create menu bar and add action
        menuBar = self.menuBar()
        fileMenu = menuBar.addMenu('&File')
        fileMenu.addAction(openAction)


    def openCall(self):
        pixmap = QPixmap('./default.png')
        self.label.setPixmap(pixmap)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit( app.exec_() )