簡介

進行按鈕進行介面的跳轉，我這裡面我介紹兩種，一種是沒有使用Qtdesigner的程式碼，另一種是使用Qtdesigner的程式碼

程式碼1

import sys
from PyQt5.QtWidgets import QMainWindow, QPushButton, QApplication


class First(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.btn = QPushButton("Button", self)
        self.btn.move(30, 50)
        


        self.setGeometry(300, 300, 500, 500)
        self.setWindowTitle('Event sender')
        self.show()

class Second(QMainWindow):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.setGeometry(300, 300, 290, 150)
        self.setWindowTitle('Get sender')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    a = First()
    b = Second()
    a.show()
    a.btn.clicked.connect(b.show)
    sys.exit(app.exec_())
 

程式碼2

下面的程式碼使用了Qtdesigner的程式碼

from PyQt5 import QtCore, QtGui, QtWidgets
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QLabel,\
                                          QPushButton, QLineEdit, QMenuBar, QStatusBar
from PyQt5.QtCore import *

class FirstWindow(QWidget):

    def __init__(self, parent=None):
        # super這個用法是呼叫父類的建構函式
        # parent=None表示預設沒有父Widget，如果指定父親Widget，則呼叫之
        super(FirstWindow, self).__init__(parent)
        self.setGeometry(500, 500, 500, 500)
        self.setWindowTitle('顯示')

        self.btn = QPushButton(self)
        self.btn.setText('標定')
        self.btn.move(150, 50)


#下面的一部分是Qtdesigner的程式碼

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(624, 479)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(190, 130, 51, 31))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(330, 260, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(280, 130, 151, 21))
        self.lineEdit.setObjectName("lineEdit")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(190, 180, 51, 31))
        self.label_2.setObjectName("label_2")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(280, 190, 151, 21))
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(200, 260, 75, 23))
        self.pushButton_2.setObjectName("pushButton_2")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 624, 23))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.label.setText(_translate("MainWindow", "   長"))
        self.pushButton.setText(_translate("MainWindow", "確定"))
        self.label_2.setText(_translate("MainWindow", "   寬"))
        self.pushButton_2.setText(_translate("MainWindow", "取消"))

if __name__ == "__main__":
    app = QApplication(sys.argv)
    MainWindow = QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)

    ex = FirstWindow()
    ex.btn.clicked.connect(MainWindow.show)
    ex.show()

    sys.exit(app.exec_())