pyside6 主窗口给子窗口发送信号

通过信号发送

from PySide6.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, QPushButton, QLineEdit
from PySide6.QtCore import Signal, Slot


class Mywindow(QWidget):
    sendValueSignal = Signal(str)  # 0.创建一个信号，并且带一个字符串类型参数

    def __init__(self):
        super().__init__()

        self.mainLayout = QVBoxLayout()
        self.label = QLabel('IP:')
        self.IPLineEdit = QLineEdit()
        self.mainLayout.addWidget(self.label)
        self.mainLayout.addWidget(self.IPLineEdit)
        self.sendBtn = QPushButton('发给子窗口')
        self.mainLayout.addWidget(self.sendBtn)
        self.sendBtn.clicked.connect(self.sendValue)  # 1.将点击按钮绑定 sendValue方法
        self.btn_show = QPushButton('显示子窗口')
        self.btn_close = QPushButton('关闭子窗口')
        self.btn_hide = QPushButton('隐藏子窗口')
        self.btn_show.clicked.connect(self.openSubwindow)
        self.btn_close.clicked.connect(self.closeSubwindow)
        self.btn_hide.clicked.connect(self.hideSubwindow)
        self.mainLayout.addWidget(self.btn_hide)
        self.mainLayout.addWidget(self.btn_close)
        self.mainLayout.addWidget(self.btn_show)

        self.setLayout(self.mainLayout)
        self.bind()

    def bind(self):
        self.subwindow = Subwindow()
        self.subwindow.show()
        self.sendValueSignal.connect(self.subwindow.sublineedit.setText)  # 3.信号发生后执行绑定的方法

    def sendValue(self):
        message = self.IPLineEdit.text()
        self.sendValueSignal.emit(message)  # 2.sendValue 方法执行后触发信号发送，并且带一个参数

    def openSubwindow(self):
        self.subwindow.show()

    def closeSubwindow(self):
        self.subwindow.close()

    def hideSubwindow(self):
        self.subwindow.hide()


class Subwindow(QWidget):
    def __init__(self):
        super().__init__()
        self.mainLayout = QVBoxLayout()
        self.label = QLabel("子窗口")
        self.sublineedit = QLineEdit()
        self.mainLayout.addWidget(self.label)
        self.mainLayout.addWidget(self.sublineedit)

        self.setLayout(self.mainLayout)


if __name__ == '__main__':
    app = QApplication([])
    window = Mywindow()
    window.show()
    app.exec()

效果