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PyQt5：更新标签？

[英]PyQt5: Updating Label?

 原文  2017-04-20 17:49:26  7   2    python/ pyqt/ pyqt5/ qlabel

问题描述

I'm currently having trouble updating labels continuously, I have tried my different ways but either nothing happens or the program stops working. 我目前无法连续更新标签，我尝试了不同的方法但是没有任何反应或程序停止工作。 I have attached below part of my code. 我附上了部分代码。 Also I was hoping someone could explain exactly the purpose of def retranslateUi(self, MainWindow): 我也希望有人能够解释def retranslateUi（self，MainWindow）的目的： 

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Tom")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(800, 600)
        MainWindow.setAutoFillBackground(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.Date = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(18)
        self.Date.setFont(font)
        self.Date.setAlignment(QtCore.Qt.AlignCenter)
        self.Date.setObjectName("Date")
        self.verticalLayout.addWidget(self.Date)
        self.Time = QtWidgets.QLabel(self.centralwidget)
        self.Time.setAlignment(QtCore.Qt.AlignCenter)
        self.Time.setObjectName("It is currently " + datetime.strptime(d, "%H:%M:%S").strftime( " %I:%M:%S %p"))
        self.verticalLayout.addWidget(self.Time)
        self.Weather = QtWidgets.QLabel(self.centralwidget)
        self.Weather.setAlignment(QtCore.Qt.AlignCenter)
        self.Weather.setWordWrap(False)
        self.Weather.setObjectName("Weather")
        self.verticalLayout.addWidget(self.Weather)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem1)
        spacerItem2 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem2)
        spacerItem3 = QtWidgets.QSpacerItem(771, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem3)
        spacerItem4 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem4)
        spacerItem5 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem5)
        MainWindow.setCentralWidget(self.centralwidget)

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


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("Tom", "Tom"))
        self.Date.setText(_translate("Tom", "Today is " + week_day +" the " + (ordinal(day)) + " of " + (month)))
        self.Time.setText(_translate("Tom", "It is currently " + datetime.strptime(d, "%H:%M:%S").strftime( " %I:%M:%S %p")))
        self.Weather.setText(_translate("Tom", "New York City " + str(ctemp) + "\xb0F " + string.capwords(status)))


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

I want the label that gets the current time to keep updating and the call to weather api to happen about every 5 min. 我希望获得当前时间的标签能够不断更新，并且每隔5分钟就会调用天气api。 Any help is greatly appreciated! 任何帮助是极大的赞赏！

2 个解决方案

解决方案1
 3 已采纳  2017-04-20 19:14:58

To implement the code we will do the following: 要实现代码，我们将执行以下操作：

  1. To update the time we use a timer. 要更新我们使用计时器的时间。
  2. To obtain the weather data, we use the pyowm library. 要获取天气数据，我们使用pyowm库。
  3. The task of obtaining the weather can block the main thread of the GUI, therefore we will create a Thread. 获取天气的任务可以阻止GUI的主线程，因此我们将创建一个Thread。
  4. Within the thread we will create a signal that will store the weather information and connect it to the main thread via the updateTemp slot. 在线程中，我们将创建一个信号，用于存储天气信息并通过updateTemp插槽将其连接到主线程。 
class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUi(self)
        timerTime = QtCore.QTimer(self)
        timerTime.timeout.connect(self.updateDate)
        timerTime.start(1000)
        self.pyowm = PyownThread(self)
        self.pyowm.tempSignal.connect(self.updateTemp)
        self.pyowm.start()

    def updateDate(self):
        date = QtCore.QDateTime.currentDateTime()
        self.Date.setText("Today is " + date.toString("ddd MMMM d yyyy"))
        self.Time.setText("It is currently " + date.toString("hh:mm:ss ap"))

    def updateTemp(self, temp):
        self.Weather.setText("New York City temperature:" + str(temp['temp']) + " \u00B0C")

Thread: 线： 

class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8')


    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            self.sleep(5*60)

About the question: could explain exactly the purpose of def retranslateUi(self, MainWindow)? 关于这个问题： 可以准确解释def retranslateUi（self，MainWindow）的目的吗？

This serves to make translatable into several languages, for example the same code could be used for an audience that speaks English, Spanish, German, etc. For your purposes it is not necessary. 这可以翻译成多种语言，例如，相同的代码可以用于说英语，西班牙语，德语等的听众。对于您的目的，没有必要。

Complete code: 完整代码： 

from PyQt5 import QtWidgets, QtGui, QtCore
import pyowm


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Tom")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(800, 600)
        MainWindow.setAutoFillBackground(False)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.Date = QtWidgets.QLabel(self.centralwidget)
        font = QtGui.QFont()
        font.setPointSize(18)
        self.Date.setFont(font)
        self.Date.setAlignment(QtCore.Qt.AlignCenter)
        self.Date.setObjectName("Date")
        self.verticalLayout.addWidget(self.Date)
        self.Time = QtWidgets.QLabel(self.centralwidget)

        self.verticalLayout.addWidget(self.Time)
        self.Weather = QtWidgets.QLabel(self.centralwidget)
        self.Weather.setAlignment(QtCore.Qt.AlignCenter)
        self.Weather.setWordWrap(False)
        self.Weather.setObjectName("Weather")
        self.verticalLayout.addWidget(self.Weather)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem)
        spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem1)
        spacerItem2 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem2)
        spacerItem3 = QtWidgets.QSpacerItem(771, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem3)
        spacerItem4 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem4)
        spacerItem5 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.verticalLayout.addItem(spacerItem5)
        MainWindow.setCentralWidget(self.centralwidget)

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


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("Tom", "Tom"))
        self.Date.setText(_translate("Tom", "Today is "))
        self.Time.setText(_translate("Tom", "It is currently "))
        self.Weather.setText(_translate("Tom", "New York City" ))


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent=parent)
        self.setupUi(self)
        timerTime = QtCore.QTimer(self)
        timerTime.timeout.connect(self.updateDate)
        timerTime.start(1000)
        self.pyowm = PyownThread(self)
        self.pyowm.tempSignal.connect(self.updateTemp)
        self.pyowm.start()

    def updateDate(self):
        date = QtCore.QDateTime.currentDateTime()
        self.Date.setText("Today is " + date.toString("ddd MMMM d yyyy"))
        self.Time.setText("It is currently " + date.toString("hh:mm:ss ap"))

    def updateTemp(self, temp):
        self.Weather.setText("New York City temperature:" + str(temp['temp']) + " \u00B0C")


class PyownThread(QtCore.QThread):
    tempSignal = QtCore.pyqtSignal(dict)
    def __init__(self, parent=None):
        super(PyownThread, self).__init__(parent=parent)
        self.owm = pyowm.OWM('1589dbcc0e9608e5b70f0ede23e757c8') 

    def run(self):
        while True:
            observation = self.owm.weather_at_place('New York,us')
            w = observation.get_weather()
            ctemp = w.get_temperature('celsius')
            self.tempSignal.emit(ctemp)
            QtCore.QThread.sleep(5*60)



if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

在此输入图像描述

解决方案2
 1  2017-04-20 18:47:09

Here is a small working example that should help you. 这是一个应该帮助你的小工作示例。 QTimer is used for periodical calling the update_labelTime function. QTimer用于定期调用update_labelTime函数。 

import sys
from PyQt5.QtCore import QTimer, QTime
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel

class MyApp(QMainWindow):
    def __init__(self):
        super(MyApp, self).__init__()

        self.labelTime = QLabel()
        self.update_labelTime()
        self.setCentralWidget(self.labelTime)

        self.timer = QTimer()
        self.timer.timeout.connect(self.update_labelTime)
        self.timer.start(1000) # repeat self.update_labelTime every 1 sec

    def update_labelTime(self):

        time_str = "Current time: {0}".format(QTime.currentTime().toString())
        self.labelTime.setText(time_str)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MyApp()
    window.show()
    sys.exit(app.exec_())

PS Don't forget to change the updating period in timer.start call PS不要忘记在timer.start调用中更改更新周期

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