Cannot send events to objects owned by a different thread.

原本打算对按钮做一个动画效果，然后每隔2S去做一次动画动作，思路是在构造函数里面创建一个线程，然后在线程里去调用按钮的槽函数，结果发现不行，报错：

Cannot send events to objects owned by a different thread.

在网上查了一下，好像意思是说ui的操作不能在别的线程里，需要通过发射信号的方式来操作，于是将代码改了一下，通过发送信号的方式来调用槽函数，结果就可以了。 

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 
#include 
void threadout()
{
    qDebug()<<"thread 1"<setupUi(this);
    std::thread t(&MainWindow::fun,this);
    t.detach();

}

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

void MainWindow::fun()
{

    while(1)
    {
         qDebug()<<"enter thread"<pushButton->clicked());
  //       on_pushButton_clicked();  //这里不允许这样使用，会提示Cannot send events to objects owned by a different thread.
    }
}


void MainWindow::on_pushButton_clicked()
{
    QPropertyAnimation *_manimation_button=new QPropertyAnimation(ui->pushButton,"size");
    _manimation_button->setStartValue(QSize(92,28));
    _manimation_button->setEndValue(QSize(135,51));
    _manimation_button->setDuration(1000);
    _manimation_button->setKeyValueAt(0.5,QSize(150,100));
    _manimation_button->start();
}