qt中用定时器实现闹钟

头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include<QTime>//时间类
#include<QTimer>//时间事件类
#include<QtTextToSpeech/QTextToSpeech>//文本转语音类

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);//重写定时器事件函数声明

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::Widget *ui;

    int id;//定时器id
    int id2;
    QTextToSpeech *speech;//实例化一个语音播报员
};
#endif // WIDGET_H

源文件

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
    ,speech(new QTextToSpeech(this))//实例化申请空间
{
    ui->setupUi(this);
    this->setWindowFlag(Qt::FramelessWindowHint);//去掉头部分
    this->setAttribute(Qt::WA_TranslucentBackground);//去掉空白部分
    id = startTimer(1000);//启动计时器
}

Widget::~Widget()
{
    delete ui;
}
void Widget::timerEvent(QTimerEvent *e)
{
    //显示系统时间
    QTime sys_time = QTime::currentTime();//获取当前系统时间
    QString s = sys_time.toString("hh:mm:ss");//将系统时间转换成字符串
    if(e->timerId() == id)
    {
        ui->label->setText(s);//将系统时间设置到ui界面上的label
        ui->label->setAlignment(Qt::AlignCenter);//居中显示
    }
    if(s == ui->lineEdit->text())
    {
        killTimer(id2);
        for(int i=0;i<5;i++)
        {
            speech->say(ui->label_3->text());
        }
    }
}

//x按钮槽函数
void Widget::on_pushButton_clicked()
{
    this->close();//关闭窗口
}
//启动槽函数
void Widget::on_pushButton_2_clicked()
{
    id2 = startTimer(1000);//启动定时器
    
}

运行

qt实现登录 

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //    去掉头部
    this->setWindowFlag(Qt::FramelessWindowHint);
    //    去掉空白部分
    this->setAttribute(Qt::WA_TranslucentBackground);
    ui->lineEdit_2->setClearButtonEnabled(true);
 
};
 
Widget::~Widget()
{
    delete ui;
}
 
 
void Widget::on_pushButton_clicked()
{
    QMessageBox box;
    //设置文本框的大小
  
    if(ui->lineEdit->text() == "admin") {
        if( ui->lineEdit_2->text() == "123456" ){
         int ret = QMessageBox::information(this,"提示","登录成功",QMessageBox::Ok| QMessageBox::No);
         if(ret == QMessageBox::Ok){
             //登录界面关闭跳转下一个界面
            emit my_jump_login();
         }  
        }else{
           QMessageBox::information(this,"提示","登录失败",QMessageBox::Ok);
        }
    }else{
     QMessageBox::information(this,"提示","登录失败",QMessageBox::Ok);
    }
}
 
void Widget::on_pushButton_2_clicked()
{
    this->close();
}
 
void Widget::on_pushButton_3_clicked()
{
    this->showMinimized();
}