在sys.exit(app.exec_())之前不显示任何元素

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我尝试在窗口上显示图片(最多6张)。在此之前，您必须在第一个窗口中输入一个名称(在下面的代码中没有给出)。图片会自动从我的相机传输到电脑中，所以一开始文件夹中没有图片，但一段时间后可能直到6点。通过运行代码没有出现错误，但当所有6张图片都在正确的文件夹中时，窗口才会完全加载。因此，在sys.exit(app.exec_())运行之前不会显示任何内容。

我试着在ui.update_picture(MainWindow)之后调用sys.exit(app.exec_())，但是在这一点上就停止了。

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QIcon, QPixmap
import sys
import os
import time


path = "C:/Users/benni/Desktop/"                   # given from the first Window
folder_name = "exit_folder_test"                   # given from the first Window
source = "test"                                    # given
os.makedirs(path + folder_name)



class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.resize(1920, 1080)
        self.frame = QtWidgets.QWidget(MainWindow)
        start_x = 20                                # origin from the grid
        start_y = 80                                
        distance = 40                               # distance between the pictures
        global image_width
        image_width = 600                                                       
        global image_height
        image_height = 400

        self.picture1 = QtWidgets.QLabel(self.frame)                                         # all the different fields for the pictures, grid-layout
        self.picture1.setGeometry(QtCore.QRect(start_x, start_y, image_width, image_height))

        self.picture2 = QtWidgets.QLabel(self.frame)
        self.picture2.setGeometry(QtCore.QRect((start_x + image_width + distance), start_y, image_width, image_height))

        self.picture3 = QtWidgets.QLabel(self.frame)
        self.picture3.setGeometry(QtCore.QRect((start_x + 2*image_width + 2*distance), start_y, image_width, image_height))

        self.picture4 = QtWidgets.QLabel(self.frame)
        self.picture4.setGeometry(QtCore.QRect((start_x), (start_y + image_height + distance), image_width, image_height))

        self.picture5 = QtWidgets.QLabel(self.frame)
        self.picture5.setGeometry(QtCore.QRect((start_x + image_width + distance), (start_y + image_height + distance), image_width, image_height))

        self.picture6 = QtWidgets.QLabel(self.frame)
        self.picture6.setGeometry(QtCore.QRect((start_x + 2*image_width + 2*distance), (start_y + image_height + distance), image_width, image_height))

        self.print_button = QtWidgets.QPushButton(self.frame)       
        self.print_button.setGeometry(QtCore.QRect((start_x + 3*image_width + 2*distance) - 74, (start_y + 2*image_height + 2*distance), 75, 24)) 
        MainWindow.setCentralWidget(self.frame)

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

    def update_picture(self, MainWindow):                               # funktions to add pictures to the fields in setupUi
        pixmap1 = QPixmap(path + folder_name + "/image1.jpg").scaled(image_width, image_height)
        self.picture1.setPixmap(pixmap1)
        pixmap2 = QPixmap(path + folder_name + "/image2.jpg").scaled(image_width, image_height)
        self.picture2.setPixmap(pixmap2)
        pixmap3 = QPixmap(path + folder_name + "/image3.jpg").scaled(image_width, image_height)
        self.picture3.setPixmap(pixmap3)
        pixmap4 = QPixmap(path + folder_name + "/image4.jpg").scaled(image_width, image_height)
        self.picture4.setPixmap(pixmap4)
        pixmap5 = QPixmap(path + folder_name + "/image5.jpg").scaled(image_width, image_height)
        self.picture5.setPixmap(pixmap5)
        pixmap6 = QPixmap(path + folder_name + "/image6.jpg").scaled(image_width, image_height)
        self.picture6.setPixmap(pixmap6)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Fotobox"))
        self.print_button.setText(_translate("MainWindow", "print"))



if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()

    recording = True
    amount = 0
    number = 0
    while recording == True:
        pictures = os.listdir(path + source)         # reads the content of the given folder
        amount_update = len(pictures)         
        if amount != amount_update:                  # checks if the amount of files in the folder has changed
            amount = amount_update 
            for picture_name in pictures:                 
                number += 1
                time.sleep(1)                                   # wait until the picture is transferred
                picture_new_name = "image" + str(number) + ".jpg"
                os.rename(path + source + "/" + picture_name, path + folder_name + "/" + picture_new_name)   # renames all the given pictures and transfer them in a new folder
                if number > 0 and number < 7:           
                    ui.update_picture(MainWindow)
                    print(number)
                else:
                    recording = False
            recording = False



    sys.exit(app.exec_())

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