PyQt5 使用 pyqtSignal 进行窗口数据传递

示例1 dialog01.py

import sys
from PyQt5.QtWidgets import QMainWindow, QVBoxLayout, QPushButton, QApplication, QWidget, QLineEdit
from PyQt5.QtCore import Qt
from dialog01 import Dialog


class Wind(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.resize(400, 500)
        layout = QVBoxLayout()
        self.button1 = QPushButton('button1')
        self.button1.clicked.connect(self.show_dialog)
        self.edit = QLineEdit()

        widget = QWidget()
        layout.addWidget(self.button1)
        layout.addWidget(self.edit)
        widget.setLayout(layout)
        self.setCentralWidget(widget)

    def name_edit(self, name):
        self.edit.setText(name)

    def show_dialog(self):
        print('show_dialog')
        dialog = Dialog(self)
        dialog.update_name.connect(self.name_edit)
        dialog.setWindowModality(Qt.WindowModal)
        dialog.show()
        print('end')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Wind()
    win.show()
    sys.exit(app.exec_())

dialog01.py

from PyQt5.QtWidgets import QDialog, QVBoxLayout, QLabel, QLineEdit, QApplication
from PyQt5.QtCore import pyqtSignal
import sys


class Dialog(QDialog):
    update_name = pyqtSignal(object)

    def __init__(self, parent=None):
        super().__init__(parent)
        layout = QVBoxLayout()
        label = QLabel('name')
        layout.addWidget(label)
        self.line_edit = QLineEdit()
        self.line_edit.setPlaceholderText('input name')
        self.line_edit.textChanged.connect(self.emit_name)
        layout.addWidget(self.line_edit)
        self.setLayout(layout)

    def emit_name(self):
        name = self.line_edit.text()
        self.update_name.emit(name)

效果

示例2 dialog01.py

import sys
from PyQt5.QtWidgets import QMainWindow, QVBoxLayout, QPushButton, QApplication, QWidget, QLineEdit
from PyQt5.QtCore import Qt
from dialog01 import Dialog


class Wind(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.resize(400, 500)
        layout = QVBoxLayout()
        self.button1 = QPushButton('button1')
        self.button1.clicked.connect(self.show_dialog)
        self.edit = QLineEdit()

        widget = QWidget()
        layout.addWidget(self.button1)
        layout.addWidget(self.edit)
        widget.setLayout(layout)
        self.setCentralWidget(widget)

    def show_dialog(self):
        print('show_dialog')
        dialog = Dialog(self)
        dialog.setWindowModality(Qt.WindowModal)
        dialog.show()
        print('end')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Wind()
    win.show()
    sys.exit(app.exec_())

dialog01.py

from PyQt5.QtWidgets import QDialog, QVBoxLayout, QLabel, QLineEdit, QApplication
from PyQt5.QtCore import pyqtSignal
import sys


class Dialog(QDialog):
    update_name = pyqtSignal(object)

    def __init__(self, parent=None):
        super().__init__(parent)
        self.parent = parent
        layout = QVBoxLayout()
        label = QLabel('name')
        layout.addWidget(label)
        self.line_edit = QLineEdit()
        self.line_edit.setPlaceholderText('input name')
        self.line_edit.textChanged.connect(self.emit_name)
        layout.addWidget(self.line_edit)
        self.setLayout(layout)

    def emit_name(self):
        name = self.line_edit.text()
        self.parent.edit.setText(name)