qt 点击label标签实现打开另一个ui界面

可以使用以下代码实现：

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.setGeometry(200, 200, 300, 300)
        self.setWindowTitle("Main Window")

        self.label = QtWidgets.QLabel("Click me to open another UI")
        self.setCentralWidget(self.label)
        self.label.mousePressEvent = self.openUI    # 设置label点击事件

    def openUI(self, event):
        self.anotherUI = AnotherUI()
        self.anotherUI.show()

class AnotherUI(QtWidgets.QMainWindow):
    def __init__(self):
        super(AnotherUI, self).__init__()

        self.setGeometry(500, 200, 400, 400)
        self.setWindowTitle("Another UI")

        self.label = QtWidgets.QLabel("Another UI")
        self.setCentralWidget(self.label)

if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

当你点击 label 标签时，将会打开另一个 UI 界面。