1.闹钟

主函数

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    t = new QTimer(this);
    id=startTimer(1000);
    speecher = new QTextToSpeech(this);
}

Widget::~Widget()
{
    delete ui;
}
void Widget::timerEvent(QTimerEvent *e)
{
    QTime sys_time = QTime::currentTime();
    QString t= sys_time.toString("HH:mm:ss");
    if(e->timerId() == id)
    {
        ui->label_2->setText(t);
        ui->label_2->setAlignment(Qt::AlignCenter);
    }
    QString s = ui->lineEdit->text();
    if( s == t)
    {
        int i=0;
        while(i < 3)
        {
            speecher->say(ui->label_3->text());
            i++;
        }
    }
}
void Widget::on_pushButton_clicked()
{
    if(ui->pushButton->text() == "启动")
    {
        id=startTimer(1000);
        ui->pushButton->setText("关闭");
    }else
    {
        killTimer(id);
        ui->pushButton->setText("启动");
    }
}

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTimer>
#include <QTime>
#include <QPushButton>
#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 id;
public slots:
//    void time_slot();
    void timerEvent(QTimerEvent *e);
private slots:

    void on_pushButton_clicked();

private:
    Ui::Widget *ui;
    QTimer *t;
    QTextToSpeech *speecher;
};
#endif // WIDGET_H

2.思维导图