QProgressBar+中间显示文本

    ui->progressBar->setMaximum(Max);
    ui->progressBar->setValue(Val);
    
    ui->progressBar->setTextVisible(true);
    double dProgress = (ui->progressBar->value() - ui->progressBar->minimum()) * 100.0
                        / (ui->progressBar->maximum() - ui->progressBar->minimum());
    ui->progressBar->setFormat(QString::fromLocal8Bit("%1%").arg(QString::number(dProgress, 'f', 1)));
    ui->progressBar->setAlignment(Qt::AlignRight | Qt::AlignVCenter);  // 对齐方式