PyQt5 - 单窗体的循环渐入渐出（QTimer）

    self.timer = QTimer(Test_Transparent)self.timer.start(50)self.timer.timeout.connect(self.show)#counter用于根据计时器更新窗体透明度self.counter = 1#degree用于控制透明度的增减性（“显示-透明-显示-透明”为一个循环周期）self.degree = -0.03def show(self):if self.counter >= 1:time.sleep(3)self.counter -= 0.01self.degree *= -1else:window.setWindowOpacity(self.counter)self.counter -= self.degreeif self.counter < 0:self.degree *= -1self.counter = 0.01

实例：【心灵毒鸡汤的淡入淡出显示】

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication,QDialog
from PyQt5.QtCore import QTimer,Qt
import sys
import time
import randomclass Ui_Test_Transparent(object):def setupUi(self, Test_Transparent):Test_Transparent.setObjectName("Test_Transparent")Test_Transparent.resize(850, 620)Test_Transparent.setMinimumSize(QtCore.QSize(850, 620))Test_Transparent.setMaximumSize(QtCore.QSize(850, 620))icon = QtGui.QIcon()icon.addPixmap(QtGui.QPixmap("./img/icon.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)Test_Transparent.setWindowIcon(icon)Test_Transparent.setWindowOpacity(1)#Test_Transparent.setWindowFlags(Qt.FramelessWindowHint)self.label = QtWidgets.QLabel(Test_Transparent)self.label.setEnabled(False)self.label.setGeometry(QtCore.QRect(0, 0, 851, 621))self.label.setStyleSheet("")self.label.setText("")self.label.setPixmap(QtGui.QPixmap("./img/x.jpg"))self.label.setScaledContents(True)self.label.setObjectName("label")self.label_2 = QtWidgets.QLabel(Test_Transparent)self.label_2.setGeometry(QtCore.QRect(155, 130, 551, 341))font = QtGui.QFont()font.setPointSize(15)self.label_2.setFont(font)self.label_2.setWordWrap(True)self.label_2.setObjectName("label_2")self.retranslateUi(Test_Transparent)QtCore.QMetaObject.connectSlotsByName(Test_Transparent)def retranslateUi(self, Test_Transparent):_translate = QtCore.QCoreApplication.translateTest_Transparent.setWindowTitle(_translate("Test_Transparent", "心灵毒鸡汤"))self.timer = QTimer(Test_Transparent)self.timer.start(50)self.timer.timeout.connect(self.show)#语录列表a1 = "我感觉我也累了，不折腾了。可能我不配幸福吧，我认命了。"a2 = "我以为我能逗你笑你就会喜欢我，可我却输给了让你哭的人。"a3 = "若能避开猛烈的欢喜，自然不会有悲痛袭来。"a4 = "大学一转眼四年就过去了。"self.sentense = [a1,a2,a3,a4]self.label_2.setText(random.choice(self.sentense))#counter用于根据计时器更新窗体透明度self.counter = 1#degree用于控制透明度的增减性（“显示-透明-显示-透明”为一个循环周期）self.degree = -0.03def show(self):if self.counter >= 1:time.sleep(4)self.counter -= 0.01self.degree *= -1else:window.setWindowOpacity(self.counter)self.counter -= self.degreeif self.counter < 0:self.label_2.setText(random.choice(self.sentense))self.degree *= -1self.counter = 0.01if __name__ == "__main__":app = QApplication(sys.argv)window = QDialog()ui = Ui_Test_Transparent()ui.setupUi(window)window.show()sys.exit(app.exec_())