从 PyQt 的主窗口打开 Ui_Form

Question

嗯，这是一个困扰我好几天的问题。我正在尝试从 MainWindow 打开一个 Ui_form。由于某种原因，子窗口会立即打开和关闭。

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您的 newLog 更改为此

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

在Ui_mainwindow 类中定义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 函数内定义了 myapp = Ui_form() 变量，然后它超出范围并在函数退出时被删除。如果您要以某种方式包含对函数结尾的某些阻塞，从技术上讲，您不需要将self.form 放入__init__() 的Ui_mainWindow 中。比如说，你有一个返回的表单，需要点击一个按钮才能关闭，然后你可以照原样做，但是由于你只是 show()ing 一个小部件，你需要让它在外面存活函数。

---

编辑：例如，由于上述原因，这段代码运行得很好——你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_()