在程序运行 PyQt 时添加标签

Posted 2023-02-14

【中文标题】在程序运行 PyQt 时添加标签

【英文标题】：Add label while program running PyQt

【发布时间】：2016-11-01 00:06:03

【问题描述】：

我刚刚开始使用 Qt Designer for python，我设计了一个主窗口。我想在单击按钮时添加一个标签。我发现说要使用布局的答案，但 Qt Designer 似乎没有使用它。我正在尝试这个：

from main_ui import *
import sys
def send():
        label=QtGui.QLabel(myapp.ui.centralwidget)
        label.setGeometry(QtCore.QRect(10, 10, 46, 13))
        label.setText(myapp.ui.lineEdit.text())


try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s
app = QtGui.QApplication(sys.argv)
myapp = StartQT4()
myapp.show()
QtCore.QObject.connect(myapp.ui.pushButton, QtCore.SIGNAL(_fromUtf8("clicked()")), send)

QtCore.QMetaObject.connectSlotsByName(myapp)

sys.exit(app.exec_())

它什么也没做。我想添加一个标签，但我找不到如何做到这一点，如果有人可以帮助我，我将不胜感激。我的 ui 文件是：

from PyQt4 import QtCore, QtGui
import time

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)
class StartQT4(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

class Ui_MainWindow(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(767, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(230, 300, 75, 23))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.lineEdit = QtGui.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(80, 330, 371, 71))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 767, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        self.scrollArea = QtGui.QScrollArea(self.centralwidget)
        self.scrollArea.setGeometry(QtCore.QRect(130, 70, 301, 191))
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName(_fromUtf8("scrollArea"))
        self.scrollAreaWidgetContents = QtGui.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 299, 189))
        self.scrollAreaWidgetContents.setObjectName(_fromUtf8("scrollAreaWidgetContents"))
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        p= QtGui.QPalette()
        p.setColor(QtGui.QPalette.Background, QtCore.Qt.white)
        self.scrollArea.setAutoFillBackground(True)
        self.scrollArea.setPalette(p)
        self.retranslateUi(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.pushButton.setText(_translate("MainWindow", "send", None))

【问题讨论】：

添加后有没有尝试调用label.show()？

哇！我以前试过，但不知何故没有用，现在可以了！非常感谢。

如果小部件是在显示父级之前创建的，则它们将与它们的父级一起显示。之后你需要手动调用show。这允许您创建小部件并按需显示它们。不知道你对设计师不使用布局的意思是什么，因为这是一个通常用它做的事情。

【参考方案1】：

您应该在 GUI 描述中添加标签：

from PyQt4 import QtCore, QtGui
import time

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)
class StartQT4(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

class Ui_MainWindow(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(767, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.pushButton = QtGui.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(230, 300, 75, 23))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.lineEdit = QtGui.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(80, 330, 371, 71))
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))

        self.label = QtGui.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(80, 400, 371, 71))
        font = QtGui.QFont()
        font.setPointSize(16)
        self.label.setFont(font)
        self.label.setStyleSheet(_fromUtf8("color:rgb(255, 85, 127)"))
        self.label.setObjectName(_fromUtf8("label"))


        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 767, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        self.scrollArea = QtGui.QScrollArea(self.centralwidget)
        self.scrollArea.setGeometry(QtCore.QRect(130, 70, 301, 191))
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName(_fromUtf8("scrollArea"))
        self.scrollAreaWidgetContents = QtGui.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 299, 189))
        self.scrollAreaWidgetContents.setObjectName(_fromUtf8("scrollAreaWidgetContents"))
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        p= QtGui.QPalette()
        p.setColor(QtGui.QPalette.Background, QtCore.Qt.white)
        self.scrollArea.setAutoFillBackground(True)
        self.scrollArea.setPalette(p)
        self.retranslateUi(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.pushButton.setText(_translate("MainWindow", "send", None))

然后在您的 def send(self): 中为该标签设置一个文本（假设您的 GUI 文件名为“GUI.py”：

from GUI import Ui_MainWindow
import sys
from PyQt4 import QtCore, QtGui


try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s


class MAIN(Ui_MainWindow):
    def send(self):
        print ui.lineEdit.text()
        ui.label.setText(ui.lineEdit.text())
        app.processEvents()


app = QtGui.QApplication(sys.argv)
Dialog = QtGui.QMainWindow()
ui = MAIN()
ui.setupUi(Dialog)
print dir(Dialog)

QtCore.QObject.connect(ui.pushButton, QtCore.SIGNAL(_fromUtf8("clicked()")), ui.send)

QtCore.QMetaObject.connectSlotsByName(Dialog)

Dialog.show()
sys.exit(app.exec_())