Qt - QTimer更新ui

使用QTimer更新UI ， 還是在UI主線程做更新

重點以紅色字體標示

//main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

//mainwindow.h


#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QTimer *timer;
    int counter;

private slots:
    void buttonClicked();
    void updateUI();
};

#endif // MAINWINDOW_H

//mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    timer = new QTimer(this);
    timer->setInterval(0.01);
    counter = 0;
    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(buttonClicked()));
    connect(timer,SIGNAL(timeout()),this,SLOT(updateUI()));
    timer->start();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::buttonClicked()
{


}


void MainWindow::updateUI()
{
    QString str = QString::number(counter++);
    ui->textEdit->append("update!" + str);
}