QT实现闹钟

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTimerEvent>
#include<QDateTime>
#include<QLineEdit>
#include<QLabel>
#include<QPushButton>
#include <QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT
signals:
    void my_signal();
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
    void timerEvent(QTimerEvent *event) override;

private slots:

    void on_btn1_clicked();

    void on_btn2_clicked();

private:
    Ui::Widget *ui;
    int timer_id;
    QTextToSpeech*speecher;

};
#endif // WIDGET_H

widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->btn2->setEnabled(false);
    ui->edit->setPlaceholderText("输入要响铃的时间");
    speecher=new QTextToSpeech(this);
    connect(this,&Widget::my_signal,[&](){
        speecher->say(ui->textedit->toPlainText());
    });
}

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


void Widget::on_btn1_clicked()
{
        //启动一个定时器
        timer_id=this->startTimer(1000);
        ui->btn1->setEnabled(false);
        ui->edit->setEnabled(false);
        ui->textedit->setEnabled(false);
        ui->btn2->setEnabled(true);
}
void Widget::on_btn2_clicked()
{
    this->killTimer(timer_id);
    ui->btn1->setEnabled(true);
    ui->edit->setEnabled(true);
    ui->textedit->setEnabled(true);
    ui->btn2->setEnabled(false);
    speecher->stop();
}
void Widget::timerEvent(QTimerEvent *event)
{
    if(event->timerId()==timer_id)
    {
        QDateTime sys_dt=QDateTime::currentDateTime();//获取当前系统日期时间
        ui->label->setText(sys_dt.toString("yyyy-MM-dd hh:mm:ss"));
                if(sys_dt.toString("yyyy-MM-dd hh:mm:ss")==ui->edit->text())
                {
                    emit my_signal();
                }
    }
}