#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,QDateimport 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Dialogdef 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okself.label.setText("②"+str(str)+">>自定义消息")else:#点击cancelself.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okbuttons.rejected.connect(self.reject)#点击cancellayout.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_())