PyQt5：如何在短时间内显示另一个窗口/小部件

Question

嗨，在我的应用程序中，我有主 windows，当数据来自另一个线程时，我需要在另一个屏幕上显示 2 秒钟，然后 go 回到上一个屏幕。 Screens 有很多组件，所以我制作了一个简单的版本来展示我的目的。

数据来自另一个线程成功我可以更改 label 的文本。 但是我不能让旧的消失而新的出现。

from PyQt5.QtCore import QThread
from PyQt5.QtWidgets import QApplication,QMainWindow, QLabel, QWidget, QGridLayout, QVBoxLayout, QGroupBox
from PyQt5.QtGui import QTextDocument
from PyQt5 import QtCore, Qt
from PyQt5.QtGui import QIcon, QPixmap, QFont
from time import strftime 
import datetime 
from babel.dates import format_date, format_datetime, format_time
import sys
import worker
import time


class Form(QWidget):

    def __init__(self):
        super().__init__()
        self.label_main = QLabel("Welcome")
        self.label_uid = QLabel("Exit") 
        self.left = 0
        self.top = 0
        self._width = 480
        self._height = 800

        self.layout_main = QVBoxLayout()
        self.layout_access = QVBoxLayout()

        self.obj = worker.Worker()  # no parent!
        self.thread = QThread()  # no parent!
        self.obj.return_uid.connect(self.onCardRead)     
        self.obj.moveToThread(self.thread)
        self.obj.finished.connect(self.thread.quit)
        self.thread.started.connect(self.obj.get_uid)
        self.thread.start()

        self.initUI()

    def initUI(self):
        self.setLayout(self.layout_main)
        self.layout_main.addWidget(self.label_main)
        self.setWindowTitle('Main Thread')
        self.show()

    def secondUI(self):
        self.setLayout(self.layout_access)
        self.layout_access.addWidget(self.label_uid)
        self.setWindowTitle('Access Thread')
        self.show()

Answer 1

在 show() 之后添加 self.windowname.close() 或只是 self.close()

Answer 2

试试看：

import sys
from PyQt5 import QtWidgets, QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *


class Worker(QtCore.QObject):
    return_uid = QtCore.pyqtSignal(int)
    finished = QtCore.pyqtSignal()

    def get_uid(self): 
        print("start")
        count = 0
        QtCore.QThread.msleep(1000)
        while count < 10:
            QtCore.QThread.msleep(200)      
            self.return_uid.emit(count)
            count += 1
        self.finished.emit()


class Form(QWidget):
    def __init__(self):
        super().__init__()
        self.label_main = QLabel("Welcome")
        self.label_uid = QLabel("Exit") 

        self.layout_main = QVBoxLayout()
        self.layout_access = QVBoxLayout()

#        self.obj = worker.Worker()  # no parent!
        self.obj = Worker()                           

        self.thread = QThread()     
        self.obj.return_uid.connect(self.onCardRead)     
        self.obj.moveToThread(self.thread)

#        self.obj.finished.connect(self.thread.quit)
        self.obj.finished.connect(self.close)

        self.thread.started.connect(self.obj.get_uid)
        self.thread.start()

        self.initUI()

    def initUI(self):
        self.setLayout(self.layout_main)
        self.layout_main.addWidget(self.label_main)
        self.setWindowTitle('Main Thread')
        self.show()

    def secondUI(self):
        self.setLayout(self.layout_access)
        self.layout_access.addWidget(self.label_uid)
        self.setWindowTitle('Access Thread')
        self.show()

    def onCardRead(self, id):
        self.label_main.setNum(id)            


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Form()
    sys.exit(app.exec_())        

---

更新

import sys
from PyQt5 import QtWidgets, QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *


class Worker(QtCore.QObject):
    return_uid = QtCore.pyqtSignal(int)
    finished = QtCore.pyqtSignal()

    def get_uid(self): 
        print("start")
        count = 0
        QtCore.QThread.msleep(1000)
        while count < 10:
            QtCore.QThread.msleep(500)      
            self.return_uid.emit(count)
            count += 1
        self.finished.emit()


class Form(QWidget):
    def __init__(self):
        super().__init__()
        self.label_main = QLabel("Welcome")
        self.label_uid = QLabel("Exit") 

        self.layout_main = QVBoxLayout()
#        self.layout_access = QVBoxLayout()

        self.obj = Worker()                           
        self.thread = QThread()     
        self.obj.return_uid.connect(self.onCardRead)     
        self.obj.moveToThread(self.thread)

#        self.obj.finished.connect(self.close)
        self.obj.finished.connect(self.secondUI)                # <---

        self.thread.started.connect(self.obj.get_uid)
        self.thread.start()

        self.initUI()

    def initUI(self):
        self.setLayout(self.layout_main)
        self.layout_main.addWidget(self.label_main)
        self.setWindowTitle('Main Thread')
        self.resize(300, 100)
        self.show()

    def secondUI(self):                                         # <---
        self.hide()
        self.windowSecond = QWidget()
        self.layout_access = QVBoxLayout(self.windowSecond)
        self.layout_access.addWidget(self.label_uid)
        self.windowSecond.setWindowTitle('Main Screen')
        self.windowSecond.resize(300, 200)
        self.windowSecond.show()

    def onCardRead(self, id):
        self.label_main.setNum(id)            


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Form()
    sys.exit(app.exec_())