如何判断在pyQt4行中输入/返回的时间编辑

Question

我遇到了一个问题，我无法弄清楚如何判断用户是否输入。所有我阅读过的stackoverflow帖子和文档都告诉我要添加self.textEdit.returnPressed.connect，或者其他的解决方案。我使用的PyQt 4.下面的代码：

# -*- coding: utf-8 -*- 

# Form implementation generated from reading ui file 'untitled.ui' 
# 
# Created by: PyQt4 UI code generator 4.11.4 
# 
# WARNING! All changes made in this file will be lost! 

import gi 
import signal 
gi.require_version('Gtk', '3.0') 
import sys 
import dbus 
import pygtk 
import gi 
import signal 
from PyQt4 import QtCore, QtGui 
from PyQt4.QtCore import pyqtSlot 
from PyQt4.QtCore import QUrl 
from PyQt4.QtWebKit import QWebView 

import sip 
sip.setapi('QString', 2) 
sip.setapi('QVariant', 2) 

gi.require_version('Notify', '0.7') 


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 Ui_MainWindow(object): 
    def setupUi(self, MainWindow): 
     MainWindow.setObjectName(_fromUtf8("MainWindow")) 
     MainWindow.resize(679, 600) 
     self.centralwidget = QtGui.QWidget(MainWindow) 
     self.centralwidget.setObjectName(_fromUtf8("centralwidget")) 

     self.saveButton = QtGui.QPushButton(self.centralwidget) 
     self.saveButton.setGeometry(QtCore.QRect(10, 0, 88, 28)) 
     self.saveButton.setObjectName(_fromUtf8("pushButton")) 

     self.textEdit = QtGui.QTextEdit(self.centralwidget) 
     self.textEdit.setGeometry(QtCore.QRect(0, 30, 681, 800)) 
     self.textEdit.setObjectName(_fromUtf8("textEdit")) 

     self.fontButton = QtGui.QPushButton(self.centralwidget) 
     self.fontButton.setGeometry(QtCore.QRect(400, 0, 88, 28)) 
     self.fontButton.setObjectName(_fromUtf8("fontButton")) 

     self.fontSize = QtGui.QTextEdit(self.centralwidget) 
     self.fontSize.setGeometry(QtCore.QRect(200, 0, 88, 28)) 
     self.fontSize.setObjectName(_fromUtf8("fontEdit")) 
     self.fontSize.returnPressed.connect(self.pushButtonOK.click) 

     MainWindow.setCentralWidget(self.centralwidget) 
     self.menubar = QtGui.QMenuBar(MainWindow) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 679, 24)) 
     self.menubar.setObjectName(_fromUtf8("menubar")) 

     self.menuTest = QtGui.QMenu(self.menubar) 
     self.menuTest.setObjectName(_fromUtf8("menuTest")) 
     MainWindow.setMenuBar(self.menubar) 

     self.statusbar = QtGui.QStatusBar(MainWindow) 
     self.statusbar.setObjectName(_fromUtf8("statusbar")) 
     MainWindow.setStatusBar(self.statusbar) 
     self.menubar.addAction(self.menuTest.menuAction()) 

     self.retranslateUi(MainWindow) 
     QtCore.QMetaObject.connectSlotsByName(MainWindow) 

     @QtCore.pyqtSlot() 
     def on_pushButtonOK_clicked(self): 
      inputNumber = self.lineEditNumber.text() 
      if inputNumber.isdigit(): 
       info = "You selected `{0}`" 

      else: 
       info = "Please select a number, `{0}` isn't valid!" 

      print(info.format(inputNumber)) 

     #functions 



     def save(self): 
      with open('log.txt', 'w') as yourFile: 
       yourFile.write(str(self.textEdit.toPlainText())) 

     def saveFont(self): 
      self.QtGui.QtFont.font.setPointSize(int(self.fontSize)) 


     def commander(self): 
      save(self) 

     self.saveButton.clicked.connect(lambda: save(self)) 
     self.fontButton.clicked.connect(lambda: save(self)) 



    def retranslateUi(self, MainWindow): 
     MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None)) 
     self.saveButton.setText(_translate("MainWindow", "Save text", None)) 
     self.fontButton.setText(_translate("MainWindow", "Save Font", None)) 
     self.menuTest.setTitle(_translate("MainWindow", "test", None)) 

if __name__ == "__main__": 
    import sys 
    app = QtGui.QApplication(sys.argv) 
    MainWindow = QtGui.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show() 
    sys.exit(app.exec_()) 

Answer 1

你必须失误

• returnPressed作品与QtLineEdit并使用QtTextEdit
• 你没有self.pushButtonOK但self.saveButton和self.fontButton

所以你需要

self.fontSize = QtGui.QLineEdit(self.centralwidget) 
    self.fontSize.setGeometry(QtCore.QRect(200, 0, 88, 28)) 
    self.fontSize.setObjectName(_fromUtf8("fontEdit")) 
    self.fontSize.returnPressed.connect(self.fontButton.click)