pyqt4中的滑块

Question

我是pyqt的新手，我正在尝试在pyqt4中实现滑块，但是我不知道为什么代码为什么没有生成任何输出。

我想要的是，创建3个滑块以动态更改3个值。

在这里，我正在调整文本"色调"，" sat"，" val"的字体大小。

是否有任何很好的来源可以在pyqt中学习滑块？

这是我的代码

pyqt4slider.py

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class Window(QWidget):
def __init__(self):
    super(Window, self).__init__()
    self.setGeometry(50,50,500,300)
    self.setWindowTiltle("HSV")
    self.home()
def home(self):
    #hue = 100
    #sat = 100
    #val = 100
    layout = QVBoxLayout()
    self.l1 = QLabel("hue")
    self.l2 = QLabel("sat")
    self.l3 = QLabel("val")
    self.l1.setAlignment(Qt.AlignCenter)
    self.l2.setAlignment(Qt.AlignCenter)
    self.l3.setAlignment(Qt.AlignCenter)
    layout.addWidget(self.l1)
    layout.addWidget(self.l1)
    layout.addWidget(self.l1)
    self.sl = QSlider(Qt.Horizontal)
    self.s2 = QSlider(Qt.Horizontal)
    self.s3 = QSlider(Qt.Horizontal)
    self.sl.setMinimum(0)
    self.sl.setMaximum(179)
    self.sl.setValue(20)
    self.sl.setTickPosition(QSlider.TicksBelow)
    self.sl.setTickInterval(5)
    self.s2.setMinimum(0)
    self.s2.setMaximum(255)
    self.s2.setValue(100)
    self.s2.setTickPosition(QSlider.TicksBelow)
    self.s2.setTickInterval(5)
    self.s3.setMinimum(0)
    self.s3.setMaximum(255)
    self.s3.setValue(100)
    self.s3.setTickPosition(QSlider.TicksBelow)
    self.s3.setTickInterval(5)
    layout.addWidget(self.s1)
    self.sl.valueChanged.connect(self.valuechange)
    layout.addWidget(self.s2)
    self.s2.valueChanged.connect(self.valuechange)
    layout.addWidget(self.s3)
    self.s3.valueChanged.connect(self.valuechange)
    self.setLayout(layout)
    def valuechange(self):
        sizel1 = self.sl.value()
        self.l1.setFont("Arial",sizel1)
        sizel2 = self.sl.value()
        self.l2.setFont("Arial", sizel2)
        sizel2 = self.sl.value()
        self.l2.setFont("Arial", sizel2)


def main():
    app = QApplication(sys.argv)
    ex = Window()
    ex.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

这是我在运行代码后得到的

在0.000S中进行0测试

确定

使用退出代码0完成的过程0空测试套件。

Answer 1

脚本中的大多数问题都是由错别字引起的。这是一个固定版本，应该可以正常工作：

import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.setGeometry(50,50,500,300)
        self.setWindowTitle("HSV")
        self.home()
    def home(self):
        layout = QVBoxLayout()
        self.l1 = QLabel("hue")
        self.l2 = QLabel("sat")
        self.l3 = QLabel("val")
        self.l1.setAlignment(Qt.AlignCenter)
        self.l2.setAlignment(Qt.AlignCenter)
        self.l3.setAlignment(Qt.AlignCenter)
        layout.addWidget(self.l1)
        layout.addWidget(self.l2)
        layout.addWidget(self.l3)
        self.s1 = QSlider(Qt.Horizontal)
        self.s2 = QSlider(Qt.Horizontal)
        self.s3 = QSlider(Qt.Horizontal)
        self.s1.setMinimum(0)
        self.s1.setMaximum(179)
        self.s1.setValue(20)
        self.s1.setTickPosition(QSlider.TicksBelow)
        self.s1.setTickInterval(5)
        self.s2.setMinimum(0)
        self.s2.setMaximum(255)
        self.s2.setValue(100)
        self.s2.setTickPosition(QSlider.TicksBelow)
        self.s2.setTickInterval(5)
        self.s3.setMinimum(0)
        self.s3.setMaximum(255)
        self.s3.setValue(100)
        self.s3.setTickPosition(QSlider.TicksBelow)
        self.s3.setTickInterval(5)
        layout.addWidget(self.s1)
        self.s1.valueChanged.connect(self.valuechange)
        layout.addWidget(self.s2)
        self.s2.valueChanged.connect(self.valuechange)
        layout.addWidget(self.s3)
        self.s3.valueChanged.connect(self.valuechange)
        self.setLayout(layout)
        # set the initial fonts
        self.valuechange()
    def valuechange(self):
        sizel1 = self.s1.value()
        self.l1.setFont(QFont("Arial", sizel1))
        sizel2 = self.s2.value()
        self.l2.setFont(QFont("Arial", sizel2))
        sizel3 = self.s3.value()
        self.l3.setFont(QFont("Arial", sizel3))
def main():
    app = QApplication(sys.argv)
    ex = Window()
    ex.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()