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最近在学习pyqt5编程，需要使用自定义控件，定义了一个setGroup的类，继承自QWidget。在AutoMainWin类中实例化setGroup类，期望在QMainWindow上显示setGroup的内容，发现自定义的类setGroup并不能显示。把setGroup类作为主窗口在__name__ == '__main__'中实例化，发现也不能正常显示。确定是自定义控件的问题，而不是放在AutoMainWin中才不能显示的。排查setGroup类内容，最终发现是因为缺少了self.setLayout(self.Hbox)。附代码如下：

​#!import sysimport serialfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class SetWin(QWidget):    def __init__(self):        super(SetWin, self).__init__()        self.initUI()    def initUI(self):        comNum = ['Com1', 'Com2', 'Com3', 'Com4']        self.setGeometry(200, 200, 100, 150)        self.setWindowTitle('Set Com Port')        self.sltPortLB = QLabel('Select Com Port')        self.sltPort = QComboBox()        self.sltPort.addItems(comNum)        vbox = QVBoxLayout()        vbox.addWidget(self.sltPortLB)        vbox.addWidget(self.sltPort)        vbox.addStretch(1)        self.setLayout(vbox)        self.setWindowModality(Qt.ApplicationModal)        self.show()        print('init setwin')class setGroup(QWidget):    def __init__(self):        super(setGroup, self).__init__()        self.grp = QGroupBox()        self.grp.setTitle('Set Com Port')        self.sltlb = QLabel('Select Port')        self.startbtn = QPushButton('Start')        self.combx = QComboBox()        self.combx.addItem('Com1')        self.HboxSlt = QHBoxLayout()        self.HboxSlt.addWidget(self.sltlb)        self.HboxSlt.addWidget(self.combx)        self.HboxSlt.addStretch(1)        self.Vbox = QVBoxLayout()        self.Vbox.addLayout(self.HboxSlt)        self.Vbox.addWidget(self.startbtn)        self.grp.setLayout(self.Vbox)        self.Hbox = QHBoxLayout()        self.Hbox.addWidget(self.grp)        self.Hbox.addStretch(1)        self.setLayout(self.Hbox)        print('set group')class AutoMainWin(QMainWindow):    def __init__(self):        super(AutoMainWin, self).__init__()        self.initUI()    def initUI(self):        self.setGeometry(100, 100, 640, 480)        self.setWindowTitle('test tool')        comAction = QAction(QIcon('set.png'), 'Set Com', self)        comAction.setShortcut('Ctrl+T')        comAction.triggered.connect(self.openSetWin)        self.toolbar = self.addToolBar('Set')        self.toolbar.addAction(comAction)        self.toolbar.setIconSize(QSize(42, 36))        lb = QLabel('name1')        setgrp = setGroup()        self.Vbox = QVBoxLayout()        self.Vbox.addWidget(setgrp)        self.Vbox.addWidget(lb)        self.Vbox.addStretch(1)        #self.setLayout(self.Vbox)        wgt = QWidget()        wgt.setLayout(self.Vbox)        self.setCentralWidget(wgt)    def openSetWin(self):        self.setwin = SetWin()        print('set window')if __name__ == '__main__':    app = QApplication(sys.argv)    gAutoMain = AutoMainWin()    gAutoMain.show()    sys.exit(app.exec_())​

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