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widget.h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();

    int tid = 0;//定义计时器id
    QTextToSpeech *speaker;//声明语音播报类名

private slots:
    void on_start_clicked();
    void timerEvent(QTimerEvent *event) override; //重写时间事件处理函数

    void on_end_clicked();

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H

widget.cpp源文件

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

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

Widget::~Widget()
{
    delete ui;
}

void Widget::on_start_clicked()
{
    tid = this->startTimer(1000);//启动定时器
}
void Widget::on_end_clicked()
{
    this->killTimer(tid);//关闭定时器
}

void Widget::timerEvent(QTimerEvent *event)
{

    if(event->timerId()==tid)
    {
        QDateTime systime = QDateTime::currentDateTime();//获取系统时间
        QString rel_time = systime.toString("yyyy/M/d h:mm:ss"); //将时间转换为字符串类型
        ui->lab->setText(rel_time);//展示时间

        if(rel_time == ui->tm->text())
        {
            speaker->say(ui->txt->toPlainText());
            qDebug("123");
        }
    }
}