在PyQt的主窗口中打开一个Ui_Form

Question

这个问题已经困扰我好几天了。我试图从主窗口打开一个Ui_form。由于某些原因，子窗口立即打开并关闭。

class Ui_MainWindow(QtGui.QMainWindow):
    def __init__(self,parent=None):
        QtGui.QMainWindow.__init__(self,parent)
    def setupUi(self, MainWindow):
        # Some Gui Code
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(406, 234)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.verticalLayout = QtGui.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.horizontalLayout = QtGui.QHBoxLayout()
        self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
        self.listView = QtGui.QListView(self.centralwidget)
        self.listView.setObjectName(_fromUtf8("listView"))
        self.horizontalLayout.addWidget(self.listView)
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.horizontalLayout.addWidget(self.pushButton)
        self.verticalLayout.addLayout(self.horizontalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 406, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)
        self.retranslateUi(MainWindow)
        QtCore.QObject.connect(self.pushButton , QtCore.SIGNAL("clicked()") , self.NewLog)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "New Log", None, QtGui.QApplication.UnicodeUTF8))

    def NewLog(self):
        app = QtGui.QWidget()
        myapp = new_application_log.Ui_Form()
        myapp.setupUi(app)
        myapp.show()
        #app.exec_()
class Ui_Form(QtGui.QWidget):
    def __init__(self,parent = None):
        QtGui.QWidget.__init__(self,parent)
    def setupUi(self, Form):
        # Some Gui Code.
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(312, 269)
        self.verticalLayout = QtGui.QVBoxLayout(Form)
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.listView = QtGui.QListView(Form)
        self.listView.setObjectName(_fromUtf8("listView"))
        self.verticalLayout.addWidget(self.listView)
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)
    def retranslateUi(self, Form):
        Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))
def main():
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow() # <-- Instantiate QMainWindow object.
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    app.exec_()

Answer 1

最简单的解决方案是将newLog更改为

def NewLog(self):
    app = QtGui.QWidget()
    self.form = Ui_Form()
    self.form.setupUi(app)
    self.form.show()

与Ui_mainwindow类中定义的self.form

class Ui_MainWindow(QtGui.QMainWindow):
    def __init__(self,parent=None):
        QtGui.QMainWindow.__init__(self,parent)
        self.form = None

在您的代码中，您在newLog函数内部定义myapp = Ui_form()变量，然后它将超出作用域并在函数退出时被删除。如果要以某种方式包含一些函数结束的阻塞，则技术上不需要将self.form放在Ui_mainWindow的__init__()中。例如，您有一个表单，它将返回需要点击按钮才能关闭，然后您可以按照您所拥有的那样做，但由于您只是show()一个小部件，您需要让它在函数之外存活。

---

编辑:例如，由于上述原因，这段代码可以正常运行——您必须在函数退出之前单击按钮

def NewLog(self, text='I am open!', buttons=QtGui.QMessageBox.Ok):
   errorBox = QtGui.QMessageBox()
   errorBox.setText(text)
   errorBox.setStandardButtons(buttons)
   return errorBox.exec_()