这个项目最初的目的是可以倒计时，然后有个文本框，这样方便记录手机充电10分钟充了百之几，结束后可播放一段音频然后提醒一下这样子的，当然有时有些后台任务预计多久结束然后提醒一下也不错的。下面上代码及效果图
from PyQt6 import QtCore, QtGui, QtWidgets
from PyQt6.QtMultimedia import QMediaPlayer,QAudioOutput
from pathlib import Path
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(610, 374)
self.formLayout = QtWidgets.QFormLayout(Form)
self.formLayout.setObjectName("formLayout")
self.horizontalLayout_4 = QtWidgets.QHBoxLayout()
self.horizontalLayout_4.setObjectName("horizontalLayout_4")
self.verticalLayout = QtWidgets.QVBoxLayout()
self.verticalLayout.setObjectName("verticalLayout")
self.horizontalLayout = QtWidgets.QHBoxLayout()
self.horizontalLayout.setObjectName("horizontalLayout")
self.pushButton_lcd1_start = QtWidgets.QPushButton(parent=Form)
self.pushButton_lcd1_start.setObjectName("pushButton_lcd1_start")
self.horizontalLayout.addWidget(self.pushButton_lcd1_start)
self.pushButton_lcd1_pause = QtWidgets.QPushButton(parent=Form)
self.pushButton_lcd1_pause.setObjectName("pushButton_lcd1_pause")
self.horizontalLayout.addWidget(self.pushButton_lcd1_pause)
self.pushButton_lcd1_stop = QtWidgets.QPushButton(parent=Form)
self.pushButton_lcd1_stop.setObjectName("pushButton_lcd1_stop")
self.horizontalLayout.addWidget(self.pushButton_lcd1_stop)
self.verticalLayout.addLayout(self.horizontalLayout)
self.lcdNumber_1 = QtWidgets.QLCDNumber(parent=Form)
self.lcdNumber_1.setMinimumSize(QtCore.QSize(0, 100))
self.lcdNumber_1.setLineWidth(1)
self.lcdNumber_1.setDigitCount(12)
self.lcdNumber_1.setObjectName("lcdNumber_1")
self.lcdNumber_1.display("00:00:00:000")
self.verticalLayout.addWidget(self.lcdNumber_1)
self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
self.horizontalLayout_2.setObjectName("horizontalLayout_2")
self.comboBox_lcd2_hour = QtWidgets.QComboBox(parent=Form)
self.comboBox_lcd2_hour.setObjectName("comboBox_lcd2_hour")
self.comboBox_lcd2_hour.setToolTip("时") #设置提示
self.comboBox_lcd2_hour.addItems(map(str,range(13)))
self.horizontalLayout_2.addWidget(self.comboBox_lcd2_hour)
self.comboBox_lcd2_minute = QtWidgets.QComboBox(parent=Form)
self.comboBox_lcd2_minute.setObjectName("comboBox_lcd2_minute")
self.comboBox_lcd2_minute.addItems(map(str,range(60)))
self.comboBox_lcd2_minute.setToolTip("分") #设置提示
self.comboBox_lcd2_minute.setCurrentText("1") #设置默认值
self.horizontalLayout_2.addWidget(self.comboBox_lcd2_minute)
self.pushButton_countdown_start = QtWidgets.QPushButton(parent=Form)
self.pushButton_countdown_start.setObjectName("pushButton_countdown_start")
self.horizontalLayout_2.addWidget(self.pushButton_countdown_start)
self.verticalLayout.addLayout(self.horizontalLayout_2)
self.lcdNumber_2 = QtWidgets.QLCDNumber(parent=Form)
self.lcdNumber_2.setMinimumSize(QtCore.QSize(0, 100))
self.lcdNumber_2.setDigitCount(8)
self.lcdNumber_2.setObjectName("lcdNumber_2")
self.lcdNumber_2.display("00:00:00")
self.verticalLayout.addWidget(self.lcdNumber_2)
self.label_countdown_info = QtWidgets.QLabel(parent=Form)
self.label_countdown_info.setObjectName("label_countdown_info")
self.verticalLayout.addWidget(self.label_countdown_info)
self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
self.horizontalLayout_3.setObjectName("horizontalLayout_3")
self.pushButton_browse_audio = QtWidgets.QPushButton(parent=Form)
self.pushButton_browse_audio.setObjectName("pushButton_browse_audio")
self.horizontalLayout_3.addWidget(self.pushButton_browse_audio)
self.pushButton_play_audio = QtWidgets.QPushButton(parent=Form)
self.pushButton_play_audio.setObjectName("pushButton_6")
self.pushButton_stopaudio = QtWidgets.QPushButton(parent=Form)
self.pushButton_stopaudio.setObjectName("pushButton_7")
self.horizontalLayout_3.addWidget(self.pushButton_play_audio)
self.horizontalLayout_3.addWidget(self.pushButton_stopaudio)
self.horizontalSlider_volume = QtWidgets.QSlider(parent=Form)
self.horizontalSlider_volume.setOrientation(QtCore.Qt.Orientation.Horizontal)
self.horizontalSlider_volume.setObjectName("horizontalSlider_volume")
self.horizontalSlider_volume.setMaximum(100) #不设置的话，默认最大值是99
self.horizontalSlider_volume.setValue(50) #设置当前滑动条位置
self.horizontalLayout_3.addWidget(self.horizontalSlider_volume)
self.verticalLayout.addLayout(self.horizontalLayout_3)
self.label_currentaudio_info = QtWidgets.QLabel(parent=Form)
self.label_currentaudio_info.setObjectName("label_currentaudio_info")
self.verticalLayout.addWidget(self.label_currentaudio_info)
spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Policy.Minimum, QtWidgets.QSizePolicy.Policy.Expanding)
self.verticalLayout.addItem(spacerItem)
self.horizontalLayout_4.addLayout(self.verticalLayout)
self.plainTextEdit = QtWidgets.QPlainTextEdit(parent=Form)
self.plainTextEdit.setObjectName("plainTextEdit")
self.horizontalLayout_4.addWidget(self.plainTextEdit)
self.formLayout.setLayout(0, QtWidgets.QFormLayout.ItemRole.LabelRole, self.horizontalLayout_4)
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
self.lasttimepause_counting=0 # 因为有暂停的需求，所以需要一个变量储存上次的计时
self.current_working_dir = Path(__file__).cwd() #获取当前py文件所在路径
self.media_play=QMediaPlayer() #创建QMediaPlayer()，这个类可播放音频视频
self.audio_output=QAudioOutput() #创建一个QAudioOutput()，QMediaPlayer()要播放视频还得承载一个视频类
self.media_play.setAudioOutput(self.audio_output) #设置QMediaPlayer()的音频输出处理
self.qdeadlinetimer=QtCore.QDeadlineTimer() #创建一个QtCore.QDeadlineTimer()对象，它可设置过期时间，检测是否过期等等
self.QElapsedTimer=QtCore.QElapsedTimer() #创建一个计时QElapsedTimer对象
self.qtimer_1 = QtCore.QTimer() #分别创建两个定时器，可按指定间隔发出信号
self.qtimer_2 = QtCore.QTimer()
self.qfontmetrics = QtGui.QFontMetrics(self.label_currentaudio_info.font()) #创建一个可采用省略号处理过长文本的对象，避免因文本过长导致布局变形
self.read_exist_audiopath_config() # 读取音频文件路径配置文件
self.pushButton_lcd1_pause.setEnabled(False) #禁用计时暂停、停止按钮，避免在未开始计时相应的函数调用
self.pushButton_lcd1_stop.setEnabled(False) #禁用计时暂停、停止按钮，避免在未开始计时相应的函数调用
self.pushButton_lcd1_start.clicked.connect(lambda :self.start_counting_time(Form)) #以下都使用了临时函数lambda传参，Form在这类应由外面传入，但qt有些函数需要它，故继续传下去
self.pushButton_lcd1_pause.clicked.connect(lambda :self.pause_counting_time(Form))
self.pushButton_lcd1_stop.clicked.connect(lambda :self.stop_counting_time(Form))
self.qtimer_1.timeout.connect(lambda :self.counting_time(Form))
self.qtimer_2.timeout.connect(lambda :self.countdown_time_display(Form))
self.pushButton_countdown_start.clicked.connect(lambda :self.start_countdown_time(Form))
self.pushButton_play_audio.clicked.connect(lambda :self.play_audio(Form))
self.pushButton_stopaudio.clicked.connect(lambda :self.stop_play_audio(Form))
self.pushButton_browse_audio.clicked.connect(lambda :self.explore_audio(Form))
self.horizontalSlider_volume.valueChanged.connect(lambda :self.audio_output.setVolume(self.horizontalSlider_volume.value()/100)) #音量条即时更新音量值
self.media_play.mediaStatusChanged.connect(lambda :self.playing_status(Form)) #使用mediaStatusChanged捕获播放器的状态
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "计时小工具"))
self.pushButton_lcd1_start.setText(_translate("Form", "开始"))
self.pushButton_lcd1_pause.setText(_translate("Form", "暂停"))
self.pushButton_lcd1_stop.setText(_translate("Form", "停止"))
self.pushButton_countdown_start.setText(_translate("Form", "开始倒计时"))
self.label_countdown_info.setText(_translate("Form", "上次倒计时结束于:"))
self.pushButton_browse_audio.setText(_translate("Form", "设置音频"))
self.pushButton_play_audio.setText(_translate("Form", "测试"))
self.pushButton_stopaudio.setText(_translate("Form", "停止"))
self.label_currentaudio_info.setText(_translate("Form", "当前铃声:"))
self.plainTextEdit.setPlaceholderText(_translate("Form", "简易笔记本:")) #设置背景文字
def start_counting_time(self,Form): #定义开始计时需要的一些操作
if not self.qtimer_1.isActive(): #为避免用户多次点击出现重新计时
self.QElapsedTimer.start() #QElapsedTimer是qt中无关系统时间的计时器，不会因为修改系统时间变化而变化。start/restart方法好像差不多,它没有stop的方法
self.pushButton_lcd1_stop.setEnabled(True)
self.pushButton_lcd1_pause.setEnabled(True)
self.qtimer_1.start(50) #设置定时器发送信号间隔时间，这里1000是1秒
def counting_time(self,Form):
if self.lasttimepause_counting == 0: # 判断是否存在上次计时暂存
y=self.QElapsedTimer.elapsed()
z=QtCore.QTime.fromMSecsSinceStartOfDay(y%86400000).toString("hh:mm:ss:zzz") #QTime.fromMSecsSinceStartOfDay()秒后返回是3位的，没发现有显示秒后两位的办法。因为这方法超一天毫秒总数就无返回，所以用%86400000取余的办法实现循环计时，一天是86,400秒，不过谁会计时一整天呢
self.lcdNumber_1.display(z)
else: # 如果出现暂停又继续计时的情况，QElapsedTimer会重新从0计算，所以要加回上次计时结果
y=self.lasttimepause_counting + self.QElapsedTimer.elapsed()
z=QtCore.QTime.fromMSecsSinceStartOfDay(y%86400000).toString("hh:mm:ss:zzz")
self.lcdNumber_1.display(z)
def pause_counting_time(self,Form):
if self.qtimer_1.isActive(): # 若用户多次点击暂停，会出现self.lasttimepause_counting继续加的问题，需要判断定时器是否还在运行作对应处理
self.lasttimepause_counting += self.QElapsedTimer.elapsed() #暂停可能是多次，需用+=累加
self.qtimer_1.stop() #停止定时器
self.pushButton_lcd1_start.setText('继续')
def stop_counting_time(self,Form):
self.lasttimepause_counting = 0 #上次计时暂存归0
self.qtimer_1.stop() #停止定时器
self.pushButton_lcd1_start.setText('开始')
self.pushButton_lcd1_pause.setEnabled(False)
self.pushButton_lcd1_stop.setEnabled(False)
def start_countdown_time(self,Form):
x=QtCore.QTime.fromString(f'{self.comboBox_lcd2_hour.currentText().zfill(2)}:{self.comboBox_lcd2_minute.currentText().zfill(2)}:00') #使用QtCore.QTime.fromString返回一个Qtime对对象，方便根据时分返回总毫秒数，fromString不能识别1：1：1这样的时间格式，需使用字符串的zfill方法补位为01：01：01这样的格式
if (y:=x.msecsSinceStartOfDay())!=0: #若倒计时时间为零，倒计时无意义,这里用了海象运算符，并使用括号包，提高其优先级，否则逻辑不对
self.qdeadlinetimer.setRemainingTime(y) #设置self.qdeadlinetimer过期时间
self.qtimer_2.start(100) #以0.1秒间隔启用定时器
def countdown_time_display(self,Form): #倒计时显示函数
if not self.qdeadlinetimer.hasExpired(): #未过期时更新lcd2的显示内容
x=QtCore.QTime.fromMSecsSinceStartOfDay(self.qdeadlinetimer.remainingTime()).toString("hh:mm:ss")
self.lcdNumber_2.display(x)
else:
self.qtimer_2.stop()
self.label_countdown_info.setText(f"上次倒计时结束于: {QtCore.QDateTime().currentDateTime().toString('dd hh:mm:ss')}") #考虑到有可能跨日，使用QtCore.QDateTime()把日期也获取
self.play_audio(Form)
def play_audio(self,Form):
self.audio_output.setVolume(self.horizontalSlider_volume.value()/100)
try:
self.media_play.play() #为避免程序在播放出错时崩溃，使用try包起来，QMediaPlayer播放音频有几个步骤，有错误不能马上捕获的
except:
QtWidgets.QMessageBox.information(Form, '错误', '无法播放！')
def stop_play_audio(self,Form):
self.media_play.stop()
def explore_audio(self,Form):
self.audio_path,y = QtWidgets.QFileDialog.getOpenFileName(Form,
"选择音频文件",
"./",
"音频文件(*.mp3 *.wav *.aac *.flac *.wma)") #创建一个文件打开对话框，其中y是返回过滤器
if self.audio_path: #因为存在打开了对话框但不选择然后关闭的情形，这样将无返回值的
audio_path=Path(self.audio_path)
if (a:=len(audio_path.parts))>=(b:=len(self.current_working_dir.parts)):
if audio_path.parts[:b]==self.current_working_dir.parts: #使用工作路径长度截取文件路径，并比较，判断是否可视为相对路径
self.audio_path=str(audio_path.relative_to(self.current_working_dir)) #取得基于当前工作目录得到的相对路径
displaystr=self.qfontmetrics.elidedText(f"当前铃声:{self.audio_path}",QtCore.Qt.TextElideMode.ElideLeft,320)
self.label_currentaudio_info.setText(displaystr)
self.label_currentaudio_info.setToolTip(f"当前铃声:{self.audio_path}")
self.media_play.setSource(QtCore.QUrl.fromLocalFile(self.audio_path))
with open('audio_path.txt',encoding='utf-8',mode='w') as e:
e.write(self.audio_path)
def read_exist_audiopath_config(self):
if Path("audio_path.txt").is_file(): #检查是否存在对应文件
with open('audio_path.txt',encoding='utf-8',mode='r') as e:
check_path=Path(e.read())
if check_path.is_file(): #检查是否存在对应文件
self.audio_path=str(check_path)
displaystr=self.qfontmetrics.elidedText(f"当前铃声:{self.audio_path}",QtCore.Qt.TextElideMode.ElideLeft,320)
self.label_currentaudio_info.setText(displaystr)
self.label_currentaudio_info.setToolTip(f"当前铃声:{self.audio_path}")
self.media_play.setSource(QtCore.QUrl.fromLocalFile(self.audio_path))
def playing_status(self,Form):
#print(self.media_play.mediaStatus())
if self.media_play.mediaStatus().value==7: #mediaStatus()是一个类，而无效子类的值是7
QtWidgets.QMessageBox.information(Form, '错误', '无法播放！')
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QWidget()
ui = Ui_Form()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec())
