【QT常用技术讲解】使用QMovie+QLabel播放gif动态图片，实现“正在加载”功能

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QMainWindow> void MainWindow::addloadgif(const QString& gifpath,const QString& showmsg){ QSize size = this->size(); //获取MainWindow的宽高 int rwidth = size.width(); int rheight = size.height(); int gif_width = 120; int gif_height = gif_width; // 创建一个标签来显示加载动画 m_loadingLabel = new QLabel(this); //setGeometry(int x, int y, int width, int height) x:x坐标;y:y坐标;width:宽度;height:高度 m_loadingLabel->setGeometry((rwidth-m_loadingLabel->width())/2, ((rheight - m_loadingLabel->height()) / 2)-60,gif_width,gif_height); m_msgLabel = new QLabel(showmsg,this); m_msgLabel->setAlignment(Qt::AlignCenter); // 设置文本居中 // 设置字体大小 QFont font = m_msgLabel->font(); font.setPointSize(12); // 设置为12号字体，根据需要可以调整大小 m_msgLabel->setFont(font); m_msgLabel->setGeometry((rwidth-m_msgLabel->width())/2,((rheight - m_msgLabel->height()) / 2)+60,gif_width,40); // 创建一个QMovie对象来加载GIF动画 m_movie = new QMovie(gifpath); // 替换为你的GIF路径 m_loadingLabel->setScaledContents(true); m_loadingLabel->setFixedSize(gif_width,gif_height); m_loadingLabel->setMovie(m_movie); m_movie->start(); stopLoading(); } MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { //ui->setupUi(this); // 设置主窗口 setFixedSize(600, 400); // 创建一个布局来管理标签位置 m_layout = new QVBoxLayout; // 添加一个按钮，用于模拟其他操作 m_LoadingButton = new QPushButton("关闭动画", this); m_layout->addWidget(m_LoadingButton); connect(m_LoadingButton, &QPushButton::clicked, this, &MainWindow::simulateLoading); addloadgif(":/index/img/load.gif","正在处理..."); } MainWindow::~MainWindow() { delete ui; } void MainWindow::stopLoading() { // 停止动画 //m_movie->stop(); //把标签隐藏起来 m_loadingLabel->hide(); m_msgLabel->hide(); m_LoadingButton->setText("开启动画"); m_openstatus = false; } void MainWindow::showLoading() { // //m_movie->start(); m_loadingLabel->show(); m_msgLabel->show(); m_LoadingButton->setText("关闭动画"); m_openstatus = true; } void MainWindow::simulateLoading() { if(m_openstatus){ stopLoading(); }else{ showLoading(); } }