头文件：

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTimer>
#include <QTime>
#include <QTextToSpeech>
#include <QMessageBox>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();QTimer* time;//一秒输出一次系统时间QTextToSpeech *speecher;//读者int id;//启动后1秒判断一次时间是否与系统时间相同int id2;//相同后3秒一次读内容，读三次后关闭void timerEvent(QTimerEvent *e);
private:Ui::Widget *ui;
public slots:void time_slots();private slots:void on_okbut_clicked();void on_pushButton_clicked();
};
#endif // WIDGET_H

函数： 

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent),time(new QTimer(this)),speecher(new QTextToSpeech(this)), ui(new Ui::Widget)
{ui->setupUi(this);time->start(1000);connect(time,&QTimer::timeout,this,&Widget::time_slots);
}Widget::~Widget()
{delete ui;
}void Widget::timerEvent(QTimerEvent *e)
{if(e->timerId()==id){QTime t=QTime::currentTime();QString s=t.toString("hh::mm::ss");if(s==ui->lineEdit->text()){id2=startTimer(5000);speecher->say(ui->label->text());}}else if(e->timerId()==id2){static int count=0;if(count++<3){speecher->say(ui->label->text());}else{killTimer(id2);}}
}void Widget::time_slots()
{QTime t=QTime::currentTime();QString s=t.toString("hh::mm::ss");ui->timelab->setText("系统时间："+s);ui->timelab->setAlignment(Qt::AlignCenter);}void Widget::on_okbut_clicked()
{if(ui->okbut->text()=="启动"){if(ui->lineEdit->text().size()>7){ui->okbut->setText("取消");id=startTimer(1000);}else{QMessageBox::critical(this,"错误","时间输入错误",QMessageBox::Ok);ui->lineEdit->clear();}}else{QMessageBox::information(this,"闹钟","闹钟已经取消!",QMessageBox::Ok);ui->okbut->setText("启动");ui->lineEdit->clear();killTimer(id);killTimer(id2);}
}void Widget::on_pushButton_clicked()
{this->close();
}

 现象：