如何设置 QFrame 的初始大小？

最大宽度：整数

此属性包含小部件的最大宽度（以像素为单位）。

此属性对应于由 maximumSize 属性保持的宽度。

...
self.frame.setMaximumWidth(48)                         # !!! +++
...

另请注意：

• 我重写了方法showmenu(self)。

• 设置您的图像。

• 不要更改 Qt Designer 生成的代码。创建另一个从相应小部件继承的类，并使用生成的类来填充它。

• 等等。

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


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
# ???        self.menuvisible = 0
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1000, 653)
        MainWindow.setStyleSheet("")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setStyleSheet("background-color: qlineargradient(spread:pad, x1:0, y1:0, x2:0, y2:1, stop:0.263699 rgba(28, 33, 44, 255), stop:0.784247 rgba(41, 48, 60, 255));")
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setSpacing(0)
        self.verticalLayout.setObjectName("verticalLayout")
        
        self.root = QtWidgets.QFrame(self.centralwidget)
        self.root.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.root.setFrameShadow(QtWidgets.QFrame.Raised)
        self.root.setObjectName("root")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.root)
        self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout_2.setSpacing(0)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.frame_ = QtWidgets.QFrame(self.root)
        self.frame_.setMinimumSize(QtCore.QSize(0, 60))
        self.frame_.setMaximumSize(QtCore.QSize(16777215, 60))
        self.frame_.setStyleSheet("")
        self.frame_.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_.setObjectName("frame_")
        self.horizontalLayout_3 = QtWidgets.QHBoxLayout(self.frame_)
#                                                  5 
        self.horizontalLayout_3.setContentsMargins(10, 0, 0, 0)
        self.horizontalLayout_3.setSpacing(0)
        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
        
        self.frame_2 = QtWidgets.QFrame(self.frame_)
        self.frame_2.setMinimumSize(QtCore.QSize(250, 0))
        self.frame_2.setMaximumSize(QtCore.QSize(250, 16777215))
        self.frame_2.setStyleSheet("")
        self.frame_2.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_2.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_2.setObjectName("frame_2")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.frame_2)
        self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout.setSpacing(6)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(self.frame_2)
        self.pushButton.setMinimumSize(QtCore.QSize(45, 45))
        self.pushButton.setMaximumSize(QtCore.QSize(45, 45))
        self.pushButton.setStyleSheet("border:none;")
        self.pushButton.setText("")
        icon = QtGui.QIcon()
# !        
#        icon.addPixmap(QtGui.QPixmap("Ok.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        icon.addPixmap(QtGui.QPixmap("Ok.png").scaled(45, 45))

        self.pushButton.setIcon(icon)
        self.pushButton.setIconSize(QtCore.QSize(55, 55))
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.label = QtWidgets.QLabel(self.frame_2)
        font = QtGui.QFont()
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        
        self.horizontalLayout_3.addWidget(self.frame_2)
        spacerItem = QtWidgets.QSpacerItem(609, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout_3.addItem(spacerItem)
        self.frame_3 = QtWidgets.QFrame(self.frame_)
        self.frame_3.setMinimumSize(QtCore.QSize(100, 0))
        self.frame_3.setMaximumSize(QtCore.QSize(100, 16777215))
        self.frame_3.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_3.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_3.setObjectName("frame_3")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.frame_3)
        self.horizontalLayout_2.setSpacing(5)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        spacerItem1 = QtWidgets.QSpacerItem(15, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.horizontalLayout_2.addItem(spacerItem1)
        self.miniBtn = QtWidgets.QPushButton(self.frame_3)
        self.miniBtn.setMinimumSize(QtCore.QSize(26, 26))
        self.miniBtn.setMaximumSize(QtCore.QSize(26, 26))
        self.miniBtn.setStyleSheet("QPushButton{\n"
"    background-color:rgb(97, 97, 97);\n"
"    border:none;\n"
"    border-radius: 13;\n"
"}\n"
"QPushButton:hover{\n"
"    background-color: rgb(134, 134, 134);\n"
"}\n"
"\n"
"QPushButton:pressed{    \n"
"    background-color: rgb(0, 0, 0);\n"
"}")
        self.miniBtn.setText("")
        icon1 = QtGui.QIcon()
        icon1.addPixmap(QtGui.QPixmap("Ok.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.miniBtn.setIcon(icon1)
        self.miniBtn.setIconSize(QtCore.QSize(22, 22))
        self.miniBtn.setObjectName("miniBtn")
        self.horizontalLayout_2.addWidget(self.miniBtn)
        self.closeBtn = QtWidgets.QPushButton(self.frame_3)
        self.closeBtn.setMinimumSize(QtCore.QSize(26, 26))
        self.closeBtn.setMaximumSize(QtCore.QSize(26, 26))
        self.closeBtn.setStyleSheet("QPushButton{\n"
"    background-color:rgb(97, 97, 97);\n"
"    border:none;\n"
"    border-radius: 13;\n"
"}\n"
"QPushButton:hover{\n"
"    background-color: rgb(134, 134, 134);\n"
"}\n"
"\n"
"QPushButton:pressed{    \n"
"    background-color: rgb(0, 0, 0);\n"
"}")
        self.closeBtn.setText("")
        icon2 = QtGui.QIcon()
# !                                    vvvvvv
        icon2.addPixmap(QtGui.QPixmap("Ok.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.closeBtn.setIcon(icon2)
        self.closeBtn.setIconSize(QtCore.QSize(22, 22))
        self.closeBtn.setObjectName("closeBtn")
        self.horizontalLayout_2.addWidget(self.closeBtn)
        self.horizontalLayout_3.addWidget(self.frame_3)
        self.verticalLayout_2.addWidget(self.frame_)
        
        self.frame_5 = QtWidgets.QFrame(self.root)
        self.frame_5.setStyleSheet("")
        self.frame_5.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_5.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_5.setObjectName("frame_5")
        self.horizontalLayout_5 = QtWidgets.QHBoxLayout(self.frame_5)
#                                                  5        
        self.horizontalLayout_5.setContentsMargins(5, 0, 0, 0)
        self.horizontalLayout_5.setSpacing(0)
        self.horizontalLayout_5.setObjectName("horizontalLayout_5")

        self.frame = QtWidgets.QFrame(self.frame_5)
# ???
#        self.frame.resize(48, 589)
#        self.frame.setMinimumSize(QtCore.QSize(48, 589))
#        self.frame.setMaximumSize(QtCore.QSize(200, 16000))
# ???
        
        self.frame.setStyleSheet("background-color: rgb(58, 65, 82);\n"
"border-radius: 23;")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.verticalLayout_4 = QtWidgets.QVBoxLayout(self.frame)
        self.verticalLayout_4.setObjectName("verticalLayout_4")
        self.menu = QtWidgets.QPushButton(self.frame)
# ???        
#        self.menu.clicked.connect(self.showmenu)                 # Показываем окно
        
#        self.menu.setMinimumSize(QtCore.QSize(30, 25))
        self.menu.setMinimumSize(QtCore.QSize(35, 35))
        self.menu.setMaximumSize(QtCore.QSize(16000, 25))
        self.menu.setStyleSheet("border:none;")
        self.menu.setText("")
        icon3 = QtGui.QIcon()
# !
#        icon3.addPixmap(QtGui.QPixmap("Ok.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        icon3.addPixmap(QtGui.QPixmap("Ok.png").scaled(35, 35))
        
        self.menu.setIcon(icon3)
        self.menu.setIconSize(QtCore.QSize(35, 35))
        self.menu.setObjectName("menu")
        self.verticalLayout_4.addWidget(self.menu)
        spacerItem2 = QtWidgets.QSpacerItem(
            20, 58, 
            QtWidgets.QSizePolicy.Minimum, 
            QtWidgets.QSizePolicy.Minimum                   # - Expanding
        )
        self.verticalLayout_4.addItem(spacerItem2)
        
        self.frame_6 = QtWidgets.QFrame(self.frame)
        
#        self.frame_6.setMinimumSize(QtCore.QSize(180, 80))
#        self.frame_6.setMaximumSize(QtCore.QSize(180, 80))
        self.frame_6.setMaximumHeight(80)                                # +++               

        self.frame_6.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_6.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_6.setObjectName("frame_6")
        self.horizontalLayout_4 = QtWidgets.QHBoxLayout(self.frame_6)
        self.horizontalLayout_4.setContentsMargins(0, 9, 31, -1)
        self.horizontalLayout_4.setSpacing(1)
        self.horizontalLayout_4.setObjectName("horizontalLayout_4")
        self.label_2 = QtWidgets.QLabel(self.frame_6)
        self.label_2.setText("")
# !                                           vvvvvvvvvvvvvvvvvvvvvv
        self.label_2.setPixmap(QtGui.QPixmap("Ok.png").scaled(60, 60))
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_4.addWidget(self.label_2)
        
        self.label_3 = QtWidgets.QLabel(self.frame_6)
        self.label_3.setMinimumSize(QtCore.QSize(30, 30))
        self.label_3.setMaximumSize(QtCore.QSize(30, 30))
        self.label_3.setText("")
# !                                           vvvvvvvvvvvvvvvvvvvvvv
        self.label_3.setPixmap(QtGui.QPixmap("Ok.png").scaled(30, 30))
        self.label_3.setObjectName("label_3")
        self.horizontalLayout_4.addWidget(self.label_3)
# ???        spacerItem3 = QtWidgets.QSpacerItem(18, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
# ???        self.horizontalLayout_4.addItem(spacerItem3)
        
        self.weapon = QtWidgets.QPushButton(self.frame_6)
#        sizePolicy = QtWidgets.QSizePolicy(
#            QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Fixed)
#        sizePolicy.setHorizontalStretch(0)
#        sizePolicy.setVerticalStretch(0)
#        sizePolicy.setHeightForWidth(self.weapon.sizePolicy().hasHeightForWidth())
#        self.weapon.setSizePolicy(sizePolicy)
        
#        self.weapon.setMinimumSize(QtCore.QSize(111, 40))
#        self.weapon.setMaximumSize(QtCore.QSize(200, 40))
        self.weapon.setMinimumWidth(111)                                # +++     
        
        font = QtGui.QFont()
        font.setFamily("Copperplate Gothic Bold")
        font.setPointSize(14)
        font.setBold(False)
        font.setWeight(50)
        self.weapon.setFont(font)
        self.weapon.setStyleSheet("QPushButton {\n"
"    border:none;\n"
"    color: rgb(78, 75, 94);      \n"
"    background-color: rgba(255, 255, 255, 0);\n"
"/* padding: 5px; */     \n"
"    }\n"
"\n"
"QPushButton:hover {\n"
"    color: rgb(168, 168, 168);\n"
"    }\n"
"QPushButton:pressed {\n"
"    border-style: inset;\n"
"    color: rgb(214, 214, 214);\n"
"    }")

# ???        self.weapon.setInputMethodHints(QtCore.Qt.ImhNone)
# ???        self.weapon.setIconSize(QtCore.QSize(35, 35))
# ???        self.weapon.setAutoExclusive(False)
        self.weapon.setObjectName("weapon")
        self.horizontalLayout_4.addWidget(self.weapon)

# !!!        
        self.verticalLayout_4.addWidget(
            self.frame_6, alignment=Qt.AlignLeft | Qt.AlignTop)           # +++      
        
        spacerItem4 = QtWidgets.QSpacerItem(20, 338, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout_4.addItem(spacerItem4)

        self.spravka = QtWidgets.QPushButton(self.frame)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.spravka.sizePolicy().hasHeightForWidth())
        self.spravka.setSizePolicy(sizePolicy)
#                                                170        
        self.spravka.setMinimumSize(QtCore.QSize(180, 40))
        self.spravka.setMaximumSize(QtCore.QSize(180, 40))
        font = QtGui.QFont()
        font.setFamily("Copperplate Gothic Bold")
        font.setPointSize(12)
        font.setBold(False)
        font.setWeight(50)
        self.spravka.setFont(font)
        self.spravka.setStyleSheet("QPushButton {\n"
"    border:none;\n"
"    color: rgb(78, 75, 94);\n"
"    background-color: rgba(255, 255, 255, 0);\n"
"    padding: 5px;\n"
"\n"
"    }\n"
"QPushButton:hover {\n"
"    color: rgb(168, 168, 168);\n"
"    }\n"
"\n"
"QPushButton:pressed {\n"
"    border-style: inset;\n"
"   \n"
"    color: rgb(214, 214, 214);\n"
"    }")
        self.spravka.setInputMethodHints(QtCore.Qt.ImhNone)
        icon4 = QtGui.QIcon()
        icon4.addPixmap(QtGui.QPixmap("Ok.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
       
        self.spravka.setIcon(icon4)
#        self.spravka.setIconSize(QtCore.QSize(55, 55))
        self.spravka.setIconSize(QtCore.QSize(30, 30))        
        
        self.spravka.setAutoExclusive(False)
        self.spravka.setObjectName("spravka")
        self.verticalLayout_4.addWidget(self.spravka)
        
        self.horizontalLayout_5.addWidget(self.frame)
        self.frame_4 = QtWidgets.QFrame(self.frame_5)
        self.frame_4.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame_4.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame_4.setObjectName("frame_4")
# +++ vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv       
        self.label_frame_4 = QtWidgets.QLabel(
            '<h1>Hello World</h1>', 
            alignment=QtCore.Qt.AlignCenter)
        self.label_frame_4.setStyleSheet("""
            background-color: qlineargradient(spread:pad, x1:0, y1:0, x2:0, y2:1, stop:0.263699 rgba(28, 33, 44, 255), stop:0.784247 rgba(41, 48, 60, 255));
            color: #fff;
        """)
        self.layout_frame_4 = QtWidgets.QHBoxLayout(self.frame_4)
        self.layout_frame_4.addWidget(self.label_frame_4)
# +++ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        
        self.horizontalLayout_5.addWidget(self.frame_4)
        self.verticalLayout_2.addWidget(self.frame_5)
        self.verticalLayout.addWidget(self.root)
        MainWindow.setCentralWidget(self.centralwidget)

        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", "<html><head/><body><p><span style=\" font-size:18pt; color:#ffffff;\">Apex - Helper</span></p></body></html>"))
        self.weapon.setText(_translate("MainWindow", "Weapons"))
#                                                      vvvvvvvvvvv        
        self.spravka.setText(_translate("MainWindow", "           Reference"))

# ??? import icons_rc


class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        
        # тут ваша логика 
        # ... vvvvvv ...
        
        self.frame.setMaximumWidth(48)                         # !!! +++
        
        self.menuvisible = False
       
        self.menu.clicked.connect(self.showmenu)               # анимация
        self.weapon.hide()

    def showmenu(self):
#        self.anim = QPropertyAnimation(self.frame, b'size')
        self.anim = QPropertyAnimation(self.frame, b"maximumWidth")     # !!!
#                                                  ^^^^^^^^^^^^^^       # !!!      
        self.anim.setDuration(400)
        if not self.menuvisible:
            self.anim.setStartValue(48)
            self.anim.setEndValue(215)
            self.weapon.show()
        else:
            self.anim.setStartValue(215)
            self.anim.setEndValue(48)
            self.weapon.hide()

        self.anim.start()
        self.menuvisible = not self.menuvisible
     

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

它是：

它变成了：

好的.png