如何从 main class 调用一个或多个 GUI 对象

Question

我有一个 gui 应用程序

我在文本框1、文本框2中输入文字，然后点击pushButton、
函数return_text_username ()在moduel_b.py中被调用。现在我可以通过lambda1函数调用一个实例并在class_b中使用它，但是当我点击pushbutton时我不能调用两个实例。

**A- 我想在 main.py 中将 lineEdit_2 添加到 lambda 方法中，或者将 instance_lambda2_password 添加到 connect 方法中。

**B- 我想在 moduel_b.py 中编辑 return_printtext_password (self, txt) 以打印和 return 密码。

谁能帮帮我？这是代码：

main.py

# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui
import sys
from GUI import Ui_MainWindow
class MainWindow(QtGui.QMainWindow,Ui_MainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        from module_b import calss_b
        global instance_b
        instance_b=calss_b(self)
        instance_lambda1_username=lambda: instance_b.return_text_username(self.ui.lineEdit.text())##I want to add lineEdit_2 
        instance_lambda2_password=lambda: instance_b.printtext2(self.ui.lineEdit_2.text())
        QtCore.QObject.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"), \
        instance_lambda1_username)## Or add instance_lambda2_password here.


if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    global myapp
    myapp = MainWindow()
    myapp.show()
    sys.exit(app.exec_())

module_b.py

import sys
from GUI import Ui_MainWindow
from PyQt4 import QtCore, QtGui
class calss_b (object):
     def __init__(self, parent=None):
      pass


     def return_text_username (self, txt):
        username=unicode(txt) 
        print username  
        return username 

      ## I want print password and return it.   
     def return_printtext_password (self, txt):
        password=unicode(txt) 
        print password   
        return password

Answer 1

您不需要为每个 slot 定义 lambda 函数，而是将它们组合成一个并将其传递给您的 connect 方法，这样：

txt1 = self.ui.lineEdit.text #Method reference not Method call
txt2 = self.ui.lineEdit2.text 
mySlot = lambda : (instance_b.return_text_username(txt1()), instance_b.return_printtext_password(txt2()))# Passed to lambda method call this time
QtCore.QObject.connect(self.ui.pushButton, QtCore.SIGNAL("clicked()"),  mySlot)

至于Point-B，我想你已经做到了，

 def return_text_username (self, txt):
     username=unicode(txt) 
     print username  
     return username

如何从 main class 调用一个或多个 GUI 对象

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