两个独立的QWidget之间的通信

马丁·杰克斯（Martin Jeaks）

有两个单独的QT Designer ui表单，两个都有两个按钮。单击form1中的按钮时，form2打开。单击form2中的按钮时如何向form1发送消息。一切正常，但消息。

form1.py

from PyQt4.QtGui import *
from PyQt4.QtCore import *
import form2                            #Import for Signal
from form2 import *                     # Import for UI
RegForm = "regform.ui"
Ui_RegForm, QtBaseClass = uic.loadUiType(RegForm)
class RegForm(QtGui.QMainWindow, Ui_RegForm):
    def __init__(self,parent = None):
        super(RegForm,self).__init__(parent,flags =                  Qt.WindowCloseButtonHint)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setupUi(self)

        self.unHideBtn.clicked.connect(self.showUnhideForm)

        self.myForm = form2.UnhideForm(self)                 #For Signal
        self.myForm.mySignal.connect(self.receiveSignal)     #Signal

    def receiveSignal(self, message):
        QtGui.QMessageBox.information(self, 'Message', message)

    def showUnhideForm(self):
        sub = UnhideForm(self)
        sub.show()

form2.py

from PyQt4 import QtCore, QtGui, uic
from PyQt4.QtGui import *
from PyQt4.QtCore import *
UnhideForm = "unhide.ui"
Ui_UnhideForm, QtBaseClass = uic.loadUiType(UnhideForm)
class UnhideForm(QtGui.QMainWindow, Ui_UnhideForm):
    mySignal = QtCore.pyqtSignal(str)#Signal
    def __init__(self,parent = None):
        super(UnhideForm,self).__init__(parent,flags = Qt.WindowCloseButtonHint)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setupUi(self)

        # On clicking emit a signal
        self.quitBtn.clicked.connect(self.emitSignal)

        # And Close the form
        self.quitBtn.clicked.connect(self.close)
    def emitSignal(self):
        if(not self.signalsBlocked()):
            self.mySignal.emit("Yes")

Form2可以正常打开，并且当quitBtn被关闭时，它会关闭。但是没有消息被发送回Form1。我是PyQt的新手。请帮忙。谢谢你。

苏宾·戈皮

这是用于将消息发送到一个UI到另一个UI的示例代码

import sys
from PyQt4 import QtGui
from PyQt4 import QtCore

class FORM1 (QtGui.QWidget):

    def __init__(self, parent=None):
        super(FORM1, self).__init__(parent)

        self.button1 = QtGui.QPushButton (self)
        self.button1.setGeometry (QtCore.QRect(10, 10, 100, 30))
        self.button1.setObjectName ('button1')
        self.button1.setText ('Button1')        

        self.textEdit = QtGui.QTextEdit(self)
        self.textEdit.setGeometry (QtCore.QRect(10, 50, 400, 100))
        self.textEdit.setObjectName('textEdit')         

        self.resize(500, 200)

        self.button1.clicked.connect (self.callForm2)     


    def callForm2 (self) :
        self.form2_widget     = FORM2 ()
        self.form2_widget.show  ()            
        self.form2_widget.button2.clicked.connect (self.sendMessage)     

    def sendMessage (self) :        
        self.textEdit.setText ('There are two separate QT Designer ui forms.Both have two buttons.')     



class FORM2 (QtGui.QWidget) :  

    def __init__(self, parent=None):
        super(FORM2, self).__init__(parent)        

        self.button2    = QtGui.QPushButton (self)
        self.button2.setGeometry(QtCore.QRect(50, 50, 100, 30))
        self.button2.setObjectName ('Button2')
        self.button2.setText ('Button2')        

        self.resize(400, 100) 


if __name__=='__main__':
    app = QtGui.QApplication(sys.argv)
    widget = FORM1 ()
    widget.show()
    app.exec_()

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