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.h代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTimerEvent>
#include <QTime>
#include <QTextToSpeech>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    void timerEvent(QTimerEvent *event) override;
    int t1;
    int t2;

private slots:
    void on_pushButton_clicked();

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

.cpp代码

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    t1=startTimer(1000);
    speech = new QTextToSpeech(this);
}

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

void Widget::timerEvent(QTimerEvent *e)
{
    if(e->timerId()==t1)
    {
        QTime sys_time = QTime::currentTime();
        QString s=sys_time.toString("hh:mm:ss");
        ui->label->setText(s);
    }
    if(e->timerId()==t2)
    {
        for (int i=0;i<5;i++)
        {
            ui->label_3->setText("好好学习天天向上");
            speech->say(ui->label_3->text());
        }
        killTimer(t2);
    }
}


void Widget::on_pushButton_clicked()
{
    QTime sys_time =QTime::currentTime();
    QTime alarm_time=ui->timeEdit->time();
    int current_s=sys_time.hour()*3600+sys_time.minute()*60+sys_time.second();
    int alarm_s=alarm_time.hour()*3600+alarm_time.minute()*60+alarm_time.second();
    t2=startTimer((alarm_s-current_s)*1000);
}

效果图