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();
}

使用定时器事件 实现闹钟

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);id = startTimer(1000);}//重写定时器事件函数的实现
void Widget::timerEvent(QTimerEvent *e){if(e->timerId() == id){QTime sys = QTime::currentTime();QString time = sys.toString("hh:mm:ss");ui->sys_time->setText(time);}
}Widget::~Widget()
{delete ui;
}void Widget::on_start_btn_clicked()
{qDebug() <<  ui->alarm_time->text();speecher = new QTextToSpeech(this);if(  ui->sys_time->text() ==  ui->voice_label->text() ){speecher->say(ui->voice_label->text());}qDebug() << "label" << ui->voice_label->text();qDebug() << ">sys_time->text:" << ui->sys_time->text();}