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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。

要求：图片的展示可以循环（QList<QString>）

要求：界面美观

二、项目代码

本质是通过添加图片进入到程序中，然后根据要求切换这些图片

在ui界面上设置四个pushbutton和一个Qlabel，按钮通过槽函数控制图片切换，Qlabel用来展示图片

//头文件dialog.h#ifndef DIALOG_H
#define DIALOG_H#include <QDialog>
#include <QPixmap>
#include <QSize>
#include<QList>
#include <QDebug>
#include <QTimer>
#include <QDateTime>
namespace Ui {
class Dialog;
}class Dialog : public QDialog
{Q_OBJECTpublic:explicit Dialog(QWidget *parent = 0);~Dialog();private:Ui::Dialog *ui;QTimer *timer;private slots:void btnClickSlot( );void btnClickSlot1( );void btnClickSlot2( );void btnClickSlot3( );void timeoutSlot();};#endif // DIALOG_H

//dialog.cpp
#include "dialog.h"
#include "ui_dialog.h"static int flag=1;
static int flag2=1;
int lastPic;QList<QString> alt;
Dialog::Dialog(QWidget *parent) :QDialog(parent),ui(new Ui::Dialog)
{ui->setupUi(this);QString s1(":/new/prefix1/1.png");QString s2(":/new/prefix1/2.png");QString s3(":/new/prefix1/3.png");QString s4(":/new/prefix1/4.png");QString s5(":/new/prefix1/5.png");QString s6(":/new/prefix1/6.png");QString s7(":/new/prefix1/7.png");QString s8(":/new/prefix1/8.png");QString s9(":/new/prefix1/9.png");QString s10(":/new/prefix1/10.png");QString s11(":/new/prefix1/11.png");QString s12(":/new/prefix1/12.png");alt.prepend(s1);// 向前追加alt.append(s2);// 向后追加alt.append(s3);// 向后追加alt.append(s4);// 向后追加alt.append(s5);// 向后追加alt.append(s6);// 向后追加alt.append(s7);// 向后追加alt.append(s8);// 向后追加alt.append(s9);// 向后追加alt.append(s10);// 向后追加alt.append(s11);// 向后追加alt.append(s12);// 向后追加connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(btnClickSlot()));connect(ui->pushButton_2,SIGNAL(clicked()),this,SLOT(btnClickSlot1()));connect(ui->pushButton_3,SIGNAL(clicked()),this,SLOT(btnClickSlot2()));connect(ui->pushButton_4,SIGNAL(clicked()),this,SLOT(btnClickSlot3()));QPixmap pic(alt.at(flag));QSize size(ui->label->width(),ui->label->height());pic =  pic.scaled(size,Qt::IgnoreAspectRatio,Qt::FastTransformation);ui->label->setPixmap(pic);timeoutSlot();// 创建定时器对象timer = new QTimer(this);// 设置触发时间timer->setInterval(50);// 设置为周期触发timer->setSingleShot(false);connect(timer,SIGNAL(timeout()),this,SLOT(timeoutSlot()));}Dialog::~Dialog()
{delete ui;
}
void Dialog::btnClickSlot()
{flag++;if(flag==6){flag=0;}qDebug()<<"右翻";QPixmap pic(alt.at(flag));QSize size(ui->label->width(),ui->label->height());pic =  pic.scaled(size,Qt::IgnoreAspectRatio,Qt::FastTransformation);ui->label->setPixmap(pic);}
void Dialog::btnClickSlot1()
{flag--;if(flag<0){flag=11;}qDebug()<<"左翻";QPixmap pic(alt.at(flag));QSize size(ui->label->width(),ui->label->height());pic =  pic.scaled(size,Qt::IgnoreAspectRatio,Qt::FastTransformation);ui->label->setPixmap(pic);}
//定时
void Dialog::timeoutSlot()
{flag++;if(flag==12){flag=0;}qDebug()<<"变化";QPixmap pic(alt.at(flag));QSize size(ui->label->width(),ui->label->height());pic =  pic.scaled(size,Qt::IgnoreAspectRatio,Qt::FastTransformation);ui->label->setPixmap(pic);}
//按钮切换
void Dialog::btnClickSlot2()
{flag2++;if(flag2>1){flag2=0;}if(flag2==0){timer->start();qDebug()<<"循环";ui->pushButton->setEnabled(false);ui->pushButton_2->setEnabled(false);ui->pushButton_4->setEnabled(false);ui->pushButton_3->setText("停止");}else if(flag2==1){qDebug()<<"单步";timer->stop();ui->pushButton->setEnabled(true);ui->pushButton_2->setEnabled(true);ui->pushButton_4->setEnabled(true);ui->pushButton_3->setText("自动");}}
//随机
void Dialog::btnClickSlot3()
{qint64 time=QDateTime::currentMSecsSinceEpoch();qsrand(time);int rand=qrand()%12;if(rand==lastPic){btnClickSlot3();}lastPic=rand;QPixmap pic(alt.at(rand));QSize size(ui->label->width(),ui->label->height());pic =  pic.scaled(size,Qt::IgnoreAspectRatio,Qt::FastTransformation);ui->label->setPixmap(pic);qDebug()<<"随机";
}

三、项目效果