Qt-Qt使用lcdNumber显示LED数据时钟(Qt5.14.2+win10)

相关资料：

https://www.baidu.com/link?url=rLDb1Ka8ErpWc0ns5BUx2FEce_pdXKgv2s4q8bbMpkMwu51BFtnYXDNqbhXwZFG_IQx9XramC0J-JZ_LtkZ_aHTahl86hFTjlZK7zAyWCCC&wd=&eqid=bffb23b9000fec3500000002620b6e5c

代码实例：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>
#include <QTime>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
private slots:
    void on_Timer();// 事件
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //
    setWindowTitle(QStringLiteral("Qt使用lcdNumber显示LED数据时钟"));
    // 定时器
    QTimer *timer = new QTimer(this);
    connect(timer, &QTimer::timeout, this, &MainWindow::on_Timer);
    timer->start(500);
}

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

void MainWindow::on_Timer()
{
    QTime time = QTime::currentTime();
    QString txtTime = time.toString("hh:mm:ss");
    ui->lcdNumber->display(txtTime);
}

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>362</width>
    <height>216</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QLCDNumber" name="lcdNumber">
    <property name="geometry">
     <rect>
      <x>20</x>
      <y>50</y>
      <width>321</width>
      <height>81</height>
     </rect>
    </property>
    <property name="frameShape">
     <enum>QFrame::NoFrame</enum>
    </property>
    <property name="digitCount">
     <number>8</number>
    </property>
    <property name="segmentStyle">
     <enum>QLCDNumber::Flat</enum>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>362</width>
     <height>22</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>