基本功能

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *class SliderDemo(QWidget):def __init__(self, parent=None):super(SliderDemo, self).__init__(parent)self.setWindowTitle("QSlider 例子") self.resize(300, 100)layout = QVBoxLayout()self.l1 = QLabel("Hello World")self.l1.setAlignment(Qt.AlignCenter)layout.addWidget(self.l1)# 水平方向self.sl = QSlider(Qt.Horizontal)#设置最小值self.sl.setMinimum(10)#设置最大值self.sl.setMaximum(50)# 步长self.sl.setSingleStep( 3 ) # 设置当前值self.sl.setValue(20)# 刻度位置，刻度在下方self.sl.setTickPosition(QSlider.TicksBelow)# 设置刻度间隔self.sl.setTickInterval(5)layout.addWidget(self.sl)# 连接信号槽self.sl.valueChanged.connect(self.valuechange)self.setLayout(layout)def valuechange(self):print('current slider value=%s' % self.sl.value() )size = self.sl.value()self.l1.setFont(QFont("Arial",size))if __name__ == '__main__':app = QApplication(sys.argv)demo = SliderDemo()demo.show()sys.exit(app.exec_())

跟着滑块显示数值

import sysfrom PyQt5.Qt import *class MSlider(QSlider):def __init__(self, parent=None, *args, **kwargs):super().__init__(parent, *args, **kwargs)self.setTickPosition(QSlider.TicksBothSides)self.setup_ui()def setup_ui(self):self.label = QLabel(self)self.label.setText("0")self.label.setStyleSheet("color: red;")self.label.hide()def get_label_pos(self) -> (int, int):"""计算label应该处于的位置"""x = int((self.width() - self.label.width()) / 2)y = int((1 - self.value() / (self.maximum() - self.minimum()))* (self.height() - self.label.height()))return x, ydef mousePressEvent(self, ev) -> None:super(MSlider, self).mousePressEvent(ev)self.label.move(*self.get_label_pos())self.label.show()self.label.setText(str(self.value()))self.label.adjustSize()def mouseMoveEvent(self, ev) -> None:super(MSlider, self).mouseMoveEvent(ev)self.label.move(*self.get_label_pos())self.label.setText(str(self.value()))self.label.adjustSize()def mouseReleaseEvent(self, ev) -> None:super(MSlider, self).mouseReleaseEvent(ev)self.label.hide()class Window(QWidget):def __init__(self):super().__init__()self.setWindowTitle("QSlider-拓展案例")self.resize(500, 500)self.setup_ui()def setup_ui(self):# 0.创建两个控件slider = MSlider(self)slider.move(200, 200)slider.resize(30, 200)if __name__ == "__main__":app = QApplication(sys.argv)window = Window()window.show()sys.exit(app.exec_())