作业要求：

1> 思维导图

2>

作业1：

作业2：

运行代码：

main.cpp

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QDebug>
#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 *e);


private slots:
    void on_btn1_clicked();

private:
    Ui::Widget *ui;
    int id;
    QString alarm;
    QString song;
};
#endif // WIDGET_H

Widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
    ,song("你怎么睡得着哒，你这个年龄段，你这个年龄段睡得着觉，有点出息没有")
{
    ui->setupUi(this);
    id = startTimer(1000);
    ui->lineEdit1->setPlaceholderText("hh/mm");

}

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

void Widget::timerEvent(QTimerEvent *e)
{
    QTime sys_time = QTime::currentTime();
    //设置闹钟的多种书写情况，规定/为分隔符
    QString s1 = sys_time.toString("hh:mm:ss");
    QString s2 = sys_time.toString("hh/mm:ss");
    QString s3 = sys_time.toString("h/m:ss");
    QString s4 = sys_time.toString("hh/m:ss");
    QString s5 = sys_time.toString("h/mm:ss");



    ui->lab1->setText(s1);
    static int num=0;
    static int flag = -1;
    //如果到时间:00秒，置flag==1;表示闹钟开始
    if(((s1==alarm+"00")|s2==(alarm+":00")|(s3==alarm+"00")|s4==(alarm+":00")|s5==(alarm+":00"))&&(flag==-1)){
        flag = 1;
    }
    ui->lab3->clear();
    //flag==1时，闹钟开始
    if(flag==1){
        //num<=5,表示闹钟响五次
        num++;
        if(num<=5){
            if(num==0){
                ui->lab3->setText(song+"\n");
            }
            ui->lab3->setText(ui->lab3->text()+song+"\n");
            QTextToSpeech *speechr = new QTextToSpeech(this);
            speechr->say(song);

        }else{
            //闹钟响五次后，重置
            ui->btn1->setText("启动");
            ui->lineEdit1->setPlaceholderText("hh:mm");
            //置flag=0 表示闹钟关闭 次数置0 清空框
            flag=0;
            num=0;
        }
    }
}
//按钮的槽函数
void Widget::on_btn1_clicked()
{
    //设置闹钟
    alarm = ui->lineEdit1->text();
    //当line为非空，按键为关闭，开启闹钟
    if(alarm.length()!=0){
        //设置闹钟为关闭 清空 设置占位符
        ui->btn1->setText("关闭");
        ui->lineEdit1->clear();
        ui->lineEdit1->setPlaceholderText(alarm);

    }else if(ui->btn1->text()=="关闭"){
        //点击关闭后，关闭闹钟 设置占位符
       ui->btn1->setText("启动");
       ui->lineEdit1->setPlaceholderText("hh:mm");
    }
    qDebug()<<"启动";
}

Widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QDebug>
#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 *e);


private slots:
    void on_btn1_clicked();

private:
    Ui::Widget *ui;
    int id;
    QString alarm;
    QString song;
};
#endif // WIDGET_H

运行截图：