我使用Qt Designer创建一个简单的UI并将其转换为Python代码.我搜索了任何检测更改窗口大小的方法.

这是生成的代码：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def onResize(event):
        print(event)

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setWindowTitle("MainWindow")
        MainWindow.resize(200, 200)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)

        MainWindow.resized.connect(self.someFunction)

        QtCore.QMetaObject.connectSlotsByName(MainWindow)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我发现了一个类似的问题QWidget resize signal?和this tutorial to handle size,建议覆盖QMainWindow的resizeEvent方法.

但他们中的任何一个都无法解决我的问题.是否有任何调整大小的函数来检测窗口大小调整,如下所示：

MainWindow.resized.connect(self.someFunction)

解决方法:

默认情况下没有这样的信号,但您可以创建调整大小的信号,我们在resizeEvent函数中发出它.

例如：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setWindowTitle("MainWindow")
        MainWindow.resize(200, 200)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        MainWindow.setCentralWidget(self.centralwidget)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


class Window(QtWidgets.QMainWindow):
    resized = QtCore.pyqtSignal()
    def  __init__(self, parent=None):
        super(Window, self).__init__(parent=parent)
        ui = Ui_MainWindow()
        ui.setupUi(self)
        self.resized.connect(self.someFunction)

    def resizeEvent(self, event):
        self.resized.emit()
        return super(Window, self).resizeEvent(event)

    def someFunction(self):
        print("someFunction")


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(app.exec_())