设计一个电子相册，点击上一张，切换到上一张图片，点击下一张，切换到下一张图片。图片的展示可以循环。使用QList<QString>存储各个图片的资源路径。
功能：输入照片库中的关键字，显示关联的照片，例如输入“熊猫”，显示熊猫照片。增加一个按钮，点击后启动或关闭自动播放。

Qt中的文件展示

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
// 头文件
#include <QList>
#include "photo.h"
#include <QDebug>
#include <QPushButton>
#include <QTimer>
#include <QDateTime>

namespace Ui {
    
class Dialog;
}

class Dialog : public QDialog
{
    
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private:
    Ui::Dialog *ui;
    QList<Photo> album2023;
    int id = 0;
    QTimer *timer;

private slots:
    void btnToPreviousPicture();
    void btnToNextPicture();
    void lineEditToSearch(QString);
    void btnToLoopPlay();
    void btnToStopPlay();
};

#endif // DIALOG_H

photo.h

#ifndef PHOTO_H
#define PHOTO_H
#include <QString>
class Photo
{
    
public:
    Photo(QString, QString);

    QString getAddr() const;
    void setAddr(const QString &value);

    QString getId() const;
    void setId(const QString &value);

private:
    QString addr;
    QString id;
};

#endif // PHOTO_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    
    ui->setupUi(this);
    qDebug()<<"打开相册";

    //创建QList对象——album2023
    Photo p1(":/new/prefix1/p1.jpeg","学习中");
    Photo p2(":/new/prefix1/p2.jpeg","工作中");
    Photo p3(":/new/prefix1/p3.jpeg","没对象");
    Photo p4(":/new/prefix1/p4.jpeg","搞钱");
    Photo p5(":/new/prefix1/p5.jpeg","热心市民");
    //添加元素
    album2023.push_back(p2);
    album2023.push_front(p1);
    album2023.append(p3);
    album2023.append(p4);
    album2023.append(p5);
    timer = new QTimer(this);
    timer->setInterval(1000);
    timer->setSingleShot(false);
    //连接信号槽
    connect(ui->btn_prePic,SIGNAL(clicked()),
            this,SLOT(btnToPreviousPicture()));
    connect(ui->btn_nexPic,SIGNAL(clicked()),
            this,SLOT(btnToNextPicture()));
    connect(ui->lineEdit,SIGNAL(textEdited(QString)),
            this,SLOT(lineEditToSearch(QString)));

    connect(ui->pushButton_play,SIGNAL(clicked()),
            this,SLOT(btnToLoopPlay()));
    connect(timer,SIGNAL(timeout()),
            this,SLOT(btnToNextPicture()));
    connect(ui->pushButton_stop,SIGNAL(clicked()),
            this,SLOT(btnToStopPlay()));

}
void Dialog::btnToPreviousPicture(){
    
    qDebug()<<"切换上一张照片";
    qDebug()<<"减操作之前id:"<<id;
    id--;
    qDebug()<<"减操作之后id:"<<id;
    if(id == -1)
    {
    id=album2023.size()-1;}
    Photo pix = album2023.at(id);
    QPixmap pic(pix.getAddr());
    ui->labelImg->setPixmap(pic);
}

void Dialog::btnToNextPicture(){
    
    qDebug()<<"切换下一张照片";
    qDebug()<<"加操作之前id:"<<id;
    id++;
    qDebug()<<"加操作之后id:"<<id;
    if(id == album2023.size())
    {
    id=0;}
    Photo pix = album2023.at(id);
    QPixmap pic(pix.getAddr());
    ui->labelImg->setPixmap(pic);
}

void Dialog::lineEditToSearch(QString text){
    
    qDebug()<<"搜索图片："<<text;
    for(id=0;id<album2023.size();id++){
    
        if(id == album2023.size())
        {
    id=0;}
    Photo pix = album2023.at(id);
    QString str=pix.getId();
    if(str.contains(text,Qt::CaseInsensitive))
    {
    
        QPixmap pic(pix.getAddr());
        ui->labelImg->setPixmap(pic);
    }
    }
}

void Dialog::btnToLoopPlay()
{
    
    timer->start();

}
void Dialog::btnToStopPlay()
{
    
    timer->stop();
}

Dialog::~Dialog()
{
    
    qDebug()<<"关闭相册";
    if(timer->isActive())
            timer->stop();
        delete timer;
    delete ui;
}

main.cpp

#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    
    QApplication a(argc, argv);
    Dialog w;
    w.show();

    return a.exec();
}

photo.cpp

#include "photo.h"

Photo::Photo(QString addr,QString id)
    :addr(addr),id(id)
{
    
}
QString Photo::getAddr() const
{
    
    return addr;
}

void Photo::setAddr(const QString &value)
{
    
    addr = value;
}

QString Photo::getId() const
{
    
    return id;
}

void Photo::setId(const QString &value)
{
    
    id = value;
}

演示效果：