PyQt5-多窗口数据传输

#窗口之间数据传递（通过属性方式）
from PyQt5.QtWidgets import QDialogButtonBox, QDateTimeEdit,QDialog,QComboBox,QTableView,QAbstractItemView,QHeaderView,QTableWidget, QTableWidgetItem, QMessageBox,QListWidget,QListWidgetItem, QStatusBar,  QMenuBar,QMenu,QAction,QLineEdit,QStyle,QFormLayout,   QVBoxLayout,QWidget,QApplication ,QHBoxLayout, QPushButton,QMainWindow,QGridLayout,QLabel
from PyQt5.QtGui import QIcon,QPixmap,QStandardItem,QStandardItemModel,QCursor,QFont,QBrush,QColor,QPainter,QMouseEvent,QImage,QTransform
from PyQt5.QtCore import QStringListModel,QAbstractListModel,QModelIndex,QSize,Qt,QObject,pyqtSignal,QTimer,QEvent,QDateTime,QDate

import sys
class Win(QWidget):
    def __init__(self,parent=None):
        super(Win, self).__init__(parent)
        self.resize(400,400)

        self.btn=QPushButton("按钮",self)
        self.btn.move(50,50)
        self.btn.setMinimumWidth(120)
        self.btn.clicked.connect(self.openDialog)

        #显示子窗口传来的日期字符串或者其他数据
        self.label=QLabel('这里显示信息',self)
        self.label.setMinimumWidth(420)

    #打开Dialog
    def openDialog(self):
        dialog=Dialog(self)
        #连接【子窗口内置消息和主窗口的槽函数】
        dialog.datetime.dateChanged.connect(self.slot_inner)
        #连接【子窗口自定义消息和主窗口槽函数】
        dialog.dialogSignel.connect(self.slot_emit)
        dialog.show()

    def slot_inner(self,date):
        print("主窗口：method_1")
        self.label.setText("①"+str(date)+">>内置消息获取日期为")

    def slot_emit(self,flag,str):
        print("主窗口：method_2")
        print(flag)
        if flag=="0":#点击ok
          self.label.setText("②"+str(str)+">>自定义消息")
        else:#点击cancel
          self.label.setText(str)

#弹出框对象
class Dialog(QDialog):
    #自定义消息
    dialogSignel=pyqtSignal(int,str)

    def __init__(self,parent=None):
        super(Dialog, self).__init__(parent)
        layout=QVBoxLayout(self)
        self.label=QLabel(self)
        self.datetime=QDateTimeEdit(self)
        self.datetime.setCalendarPopup(True)
        self.datetime.setDateTime(QDateTime.currentDateTime())
        self.label.setText("请选择日期")
        layout.addWidget(self.label)
        layout.addWidget(self.datetime)

        buttons=QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel,Qt.Horizontal,self)
        buttons.accepted.connect(self.accept)#点击ok
        buttons.rejected.connect(self.reject)#点击cancel
        layout.addWidget(buttons)
    def accept(self):#点击ok是发送内置信号
        print("accept")
        self.dialogSignel.emit(0,self.datetime.text())
        self.destroy()
    def reject(self):#点击cancel时，发送自定义信号
        print('reject')
        self.dialogSignel.emit(1,"清空")
        self.destroy()

if __name__=='__main__':

    app=QApplication(sys.argv)
    win = Win()
    win.show()
    sys.exit(app.exec_())