头文件：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTime>
#include <QTimer>
#include <QTimerEvent>
#include <QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    QString time1, time2;
    QTextToSpeech * speech;
private slots:
    void timeout();
    void on_btn_clicked();

private:
    Ui::Widget *ui;

    QTimer *t;



    int count = 0;
    int id1, id2;
    void timerEvent(QTimerEvent *e);
};
#endif // WIDGET_H

源代码：

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    id1 = startTimer(1000);
    //去除多余窗口
    this->setWindowFlag(Qt::FramelessWindowHint);
    this->setAttribute(Qt::WA_TranslucentBackground);

    t = new QTimer(this);

    connect(t,&QTimer::timeout,this,&Widget::timeout);

    speech = new QTextToSpeech(this);


}

Widget::~Widget()
{
    delete ui;
}
//讲述人
void Widget::timeout()
{
//    if(time1 == time2)
//    {
//        speech->say(ui->lab3->text());
//        speech->say(ui->lab3->text());
//        speech->say(ui->lab3->text());
//        speech->say(ui->lab3->text());
//        speech->say(ui->lab3->text());

//    }
}

//系统时间 lab1
void Widget::timerEvent(QTimerEvent *e)
{
    if(e->timerId() == id1)
    {//获取系统时间
        QTime sys_tem = QTime::currentTime();
        //转换类型
        time1 = sys_tem.toString("hh::mm::ss");
        //在lab1上呈现文本
        ui->lab1->setText(time1);
        //居中显示
        ui->lab1->setAlignment(Qt::AlignCenter);

        if(time1 == time2)
        {
            for(int i=0; i<5; i++)
            {
                speech->say(ui->lab3->text());
            }
        }
    }
    //    killTimer(id1);
}
void Widget::on_btn_clicked()
{
    if(ui->btn->text() == "启动")
    {
//        //启动定时器
//        t->start(1000);
        //改变文本
        ui->btn->setText("暂停");

        //绑定闹钟时间
        time2 = ui->lineEdit->text();
    }else{
//        //关闭定时器
//        t->stop();
        killTimer(id1);
        //改变文本
        ui->btn->setText("启动");
    }
}