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Qt界面控件中点击触发处理耗时业务的方法

news 来源：原创 2025/4/22 12:30:07

1. 使用 QtConcurrent (最简单的方式)

cpp

// 按钮点击槽函数
void MainWindow::on_pushButton_clicked()
{// 禁用按钮防止重复点击ui->pushButton->setEnabled(false);// 使用QtConcurrent在后台线程执行耗时任务QFuture<void> future = QtConcurrent::run([this]() {// 这里是耗时业务代码doTimeConsumingTask();// 任务完成后在UI线程恢复按钮状态QMetaObject::invokeMethod(this, [this]() {ui->pushButton->setEnabled(true);QMessageBox::information(this, "完成", "耗时任务执行完毕");}, Qt::QueuedConnection);});
}

2. 使用 QThread + moveToThread (更灵活的方式)

cpp

// 工作类声明
class Worker : public QObject {Q_OBJECT
public slots:void doWork() {// 耗时业务处理for(int i = 0; i < 100; i++) {QThread::msleep(50);emit progress(i);}emit finished();}
signals:void progress(int value);void finished();
};// 在窗口类中使用
void MainWindow::on_pushButton_clicked()
{ui->pushButton->setEnabled(false);QThread* thread = new QThread;Worker* worker = new Worker;worker->moveToThread(thread);connect(thread, &QThread::started, worker, &Worker::doWork);connect(worker, &Worker::finished, thread, &QThread::quit);connect(worker, &Worker::finished, worker, &QObject::deleteLater);connect(thread, &QThread::finished, thread, &QObject::deleteLater);connect(worker, &Worker::progress, this, [this](int value) {ui->progressBar->setValue(value);});connect(thread, &QThread::finished, this, [this]() {ui->pushButton->setEnabled(true);});thread->start();
}