QT 实现图片轮播

• UI设计

一个Qlabel控件,一个pushButton 键

废话不多说直接怼代码

• .h文件

#ifndef IMAGES_H
#define IMAGES_H

#include <QtWidgets/QMainWindow>
#include "ui_images.h"
#include <Qlabel>
#include <qpushbutton.h>
#include <qpixmap.h>
#include <qstring.h>
#include <qtimer.h>

class images : public QMainWindow
{
	Q_OBJECT

public:
	images(QWidget *parent=0);
	~images();

private:
	Ui::imagesClass ui;
	QTimer *qTimer;
	int imgNumber;
private slots:
	//显示图片
	void showPictureSlot();

};

#endif // IMAGES_H

• .cpp文件

#include "images.h"
#pragma execution_character_set("utf-8")

images::images(QWidget *parent)
	: QMainWindow(parent), imgNumber(0)
{
	ui.setupUi(this);
	//修改标题
	this->setWindowTitle("QLabel的显示图片程序:");

	//给label设置新的文本
	ui.picture_label->setText("未显示图片");
	//将label框的内容位于中间.
	ui.picture_label->setAlignment(Qt::AlignCenter | Qt::AlignHCenter);

	
	//设置label框自动填充
	//ui.picture_label->setScaledContents(true);

	//连接信号 与 槽
	connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(showPictureSlot()));
	

	ui.picture_label->setScaledContents(true);

	qTimer = new QTimer();

	connect(this->qTimer, SIGNAL(timeout()), this, SLOT(showPictureSlot()));

	qTimer->start(3000);
}

images::~images()
{
	delete qTimer;
}
//显示图片
void images::showPictureSlot(){
	++imgNumber;
        //图片路径(绝对路径拼接)
	QString path = ":/File/Resources/" + QString::number(imgNumber) + ".png";
	QPixmap pixmap(path);

	pixmap.scaled(ui.picture_label->size(), Qt::KeepAspectRatio);

	ui.picture_label->setPixmap(pixmap);

	if (3 == imgNumber)
	{
		imgNumber = 0;
	}
}

这样简单的图片轮播在Qlabel上就 实现了.