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#QComBoximport sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QSliderDemo(QWidget):    def __init__(self):        super(QSliderDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle('滑块控件演示')        self.resize(300,200)        layout = QVBoxLayout()        self.label = QLabel('Hello PyQt5')        self.label.setAlignment(Qt.AlignCenter)        layout.addWidget(self.label)        self.slider = QSlider(Qt.Horizontal)        self.slider.setMinimum(1)        self.slider.setMaximum(99)        #步长        self.slider.setSingleStep(2)        #设置当前值        self.slider.setValue(18)        #设置刻度位置        self.slider.setTickPosition(QSlider.TicksBelow)        #s设置刻度间隔        self.slider.setTickInterval(10)        #绑定事件        self.slider.valueChanged.connect(self.valueChange)        layout.addWidget(self.label)        layout.addWidget(self.slider)        self.setLayout(layout)    def valueChange(self):        print('当前值： %s' % self.slider.value())        size = self.slider.value()        self.label.setFont(QFont('Arial',size))if __name__ == '__main__':    app =QApplication(sys.argv)    main = QSliderDemo()    main.show()    app.exit(app.exec_())

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