Python 在PySide中创建多窗口应用程序

我是PySide的新手，我想创建一个多窗口应用程序。例如，第一个窗口将是登录窗口，如果登录正确，则登录窗口应隐藏，下一个窗口应出现

我怎样才能做到这一点

import sys
from PySide.QtGui import *
from PySide.QtCore import *
import chooseoption

class Form(QDialog):
def __init__(self, parent = None):
    super(Form,self).__init__(parent)

    self.usernamelabel = QLabel("Username : ")
    self.passwordlabel = QLabel("Password : ")
    self.username = QLineEdit()
    self.password = QLineEdit()
    self.okbutton = QPushButton("Login")
    self.username.setPlaceholderText("Enter Username Here")
    self.password.setPlaceholderText("Enter Password Here")

    layout = QGridLayout()
    layout.addWidget(self.usernamelabel,0,0)
    layout.addWidget(self.passwordlabel,1,0)
    layout.addWidget(self.username,0,1)
    layout.addWidget(self.password,1,1)
    layout.addWidget(self.okbutton)
    self.setLayout(layout)

    self.usernamelist = ['priyank','stupendo','ayaan']
    self.passwordlist = ['priyank','stupendo','ayaan']

    self.connect(self.okbutton, SIGNAL("clicked()"),self.loginfunction)

def loginfunction(self):
    usernamestatus = False
    usernameindex = -1
    passwordstatus = False
    passwordindex = -1
    for currentusername in range(len(self.usernamelist)):
        if self.passwordlist[currentusername] == self.username.text():
            usernamestatus = True
            usernameindex = self.usernamelist.index(self.passwordlist[currentusername])

    for currentpassword in range(len(self.passwordlist)):
        if self.usernamelist[currentpassword] ==self.password.text():
            passwordstatus = True
            passwordindex = self.passwordlist.index(self.usernamelist[currentpassword])

    if usernamestatus == True and passwordstatus ==True and usernameindex == passwordindex:

        w2 = chooseoption.Form1()
        w2.show()

    else:
        self.msgBox = QMessageBox()
        self.msgBox.setText("invalid!!!")
        self.msgBox.exec_()



app = QApplication(sys.argv)
form = Form()
form.show()
sys.exit(app.exec_())

这是我的chooseoption.py文件：

import sys
from PySide.QtGui import *
from PySide.QtCore import *

class Form1(QDialog):

def __init__(self, parent = None):
    super(Form1,self).__init__(parent)

    self.addbutton = QPushButton("Add file in Important list")
    self.removebutton = QPushButton("Remove file from Important list")
    self.changeaddressbutton = QPushButton("Change Location of Important File")

    layout = QHBoxLayout()
    layout.addWidget(self.addbutton)
    layout.addWidget(self.removebutton)
    layout.addWidget(self.changeaddressbutton)
    self.setLayout(layout)

---

问题是，我的第二个窗口只是在屏幕上出现了几毫秒，然后消失了。如何修复此问题？

下面的代码将连续创建三个窗口：

from PySide.QtCore import *
from PySide.QtGui import *
import sys

class W1(QWidget):
    def __init__(self, parent=None):
        super(W1, self).__init__(parent)
        self.btn = QPushButton('Click1')

        vb = QVBoxLayout()
        vb.addWidget(self.btn)
        self.setLayout(vb)

        self.btn.clicked.connect(self.fireupWindows2)

    def fireupWindows2(self):
        w2 = W2()
        if w2.exec_():
            self.w3 = W3()    
            self.w3.show()

class W2(QDialog):
    def __init__(self, parent=None):
        super(W2, self).__init__(parent)

        self.btn = QPushButton('Click2')

        vb = QVBoxLayout()
        vb.addWidget(self.btn)
        self.setLayout(vb)

        self.btn.clicked.connect(self.fireupWindows3)

    def fireupWindows3(self):
        self.accept()

class W3(QWidget):
    def __init__(self, parent=None):
        super(W3, self).__init__(parent)
        self.resize(300, 300)
        self.btn = QLabel('The Last Window')

        vb = QVBoxLayout()
        vb.addWidget(self.btn)
        self.setLayout(vb)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = W1()
    w.show()
    sys.exit(app.exec_())

---

不知怎的，我解决了上述问题

test.py文件：

import sys
from PySide.QtGui import *
from PySide.QtCore import *
import chooseoption

class Form(QDialog):
def __init__(self, parent = None):
    super(Form,self).__init__(parent)

    self.usernamelabel = QLabel("Username : ")
    self.passwordlabel = QLabel("Password : ")
    self.username = QLineEdit()
    self.password = QLineEdit()
    self.okbutton = QPushButton("Login")
    self.username.setPlaceholderText("Enter Username Here")
    self.password.setPlaceholderText("Enter Password Here")

    layout = QGridLayout()
    layout.addWidget(self.usernamelabel,0,0)
    layout.addWidget(self.passwordlabel,1,0)
    layout.addWidget(self.username,0,1)
    layout.addWidget(self.password,1,1)
    layout.addWidget(self.okbutton)
    self.setLayout(layout)

    self.usernamelist = ['priyank','stupendo','ayaan']
    self.passwordlist = ['priyank','stupendo','ayaan']

    self.connect(self.okbutton, SIGNAL("clicked()"),self.loginfunction)

def loginfunction(self):
    usernamestatus = False
    usernameindex = -1
    passwordstatus = False
    passwordindex = -1
    for currentusername in range(len(self.usernamelist)):
        if self.passwordlist[currentusername] == self.username.text():
            usernamestatus = True
            usernameindex = self.usernamelist.index(self.passwordlist[currentusername])

    for currentpassword in range(len(self.passwordlist)):
        if self.usernamelist[currentpassword] ==self.password.text():
            passwordstatus = True
            passwordindex = self.passwordlist.index(self.usernamelist[currentpassword])

    if usernamestatus == True and passwordstatus ==True and usernameindex == passwordindex:
        self.hide()
        w2 = chooseoption.Form1(self)
        w2.show()


    else:
        self.msgBox = QMessageBox()
        self.msgBox.setText("Bloody Hacker!!!")
        self.msgBox.exec_()



app = QApplication(sys.argv)
form = Form()
form.show()
sys.exit(app.exec_())

这是第二个窗口：

import sys
from PySide.QtGui import *
from PySide.QtCore import *

class Form1(QDialog):

def __init__(self, parent = None):
    super(Form1,self).__init__(parent)

    self.addbutton = QPushButton("Add file in Important list")
    self.removebutton = QPushButton("Remove file from Important list")
    self.changeaddressbutton = QPushButton("Change Location of Important File")

    layout = QVBoxLayout()
    layout.addWidget(self.addbutton)
    layout.addWidget(self.removebutton)
    layout.addWidget(self.changeaddressbutton)
    self.setLayout(layout)

重要的部分是隐藏第一个窗口，创建第二个窗口的对象，将self作为参数，然后显示第二个窗口

self.hide()
w2 = chooseoption.Form1(self)
w2.show()

---

您能解释一下为什么要使用W2类（QDialog）而不是W2类（QWidget）吗？exec_uz（）函数到底做了什么？@user2788859 QDialog继承了QWidget，只是为了让它成为一个更具体的对话框。关于

exec（）

，请尝试删除该语句，看看会发生什么；）