QProgressBar 不动，多线程实现进度条

Question

class ProcDlg : public QRunnable
{
public:
ProcDlg(QProgressBar* progressBar);

void run();

void setVal(int val);

private:
QProgressBar* m_ProgressBar;
int m_val;
};

ProcDlg::ProcDlg( QProgressBar* progressBar)
{
m_ProgressBar = progressBar;
m_val = 0;
}

void ProcDlg::setVal(int val)
{
m_val = val;
}

void ProcDlg::run()
{

while (m_val <= 100)
{
    QMetaObject::invokeMethod(m_ProgressBar, "setValue",
                              Qt::QueuedConnection, Q_ARG(int, m_val));

    QThread::sleep(1);

    if(m_val == 100)
    {
        break;
    }
}

}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void on_pushButton_clicked();

private:
Ui::MainWindow ui;
QProgressBar procBar;
ProcDlg task;
};

void MainWindow::on_pushButton_clicked()
{
task = new ProcDlg(&procBar);
procBar.show();
QThreadPool::globalInstance()->start(task);

int i = 1;
for(i = 1; i <= 10; i++)
{
    task->setVal(i*10);
    QThread::sleep(2);
}

}

QProgressBar一直都不动，这是什么原因啊？

Answer 1

using System.ComponentModel;
 
文件开头
 
    public partial class Form1 : Form
    {
        private BackgroundWorker worker = new BackgroundWorker();
 
        public Form1()
        {
            Initi......
答案就在这里：进度条实现(多线程)
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