QT里QTimer为啥stop停不，每次start就会有一个新的计时器跟着一起跑？

Posted 2023-04-15

connect(ui->stop,&QPushButton::clicked,[=]()

if (ui->stop->text() == tr("开始"))

ui->stop->setText(tr("停止"));
ui->stop->setIcon(QIcon(":/res/wrong2.png"));
ui->stop->setIconSize(QSize(40,40));
timer->start();
connect(timer,&QTimer::timeout,[=]()
if(this->countTime<=0.00)

timer->stop();
bool active=timer->isActive();
qDebug()<<active;
ui->lcdNumber->display("0.00");
ui->stop->setText(tr("开始"));
ui->stop->setIcon(QIcon(":/res/right3.png"));
QMessageBox::information(this,"提示","Time out！");

else

this->countTime=this->countTime-0.01;
if(this->countTime<0.0)

this->countTime=0.0;

char stopTime[32];
sprintf(stopTime,"%.2lf",this->countTime);
ui->lcdNumber->display(stopTime);


);

else if (ui->stop->text() == tr("停止"))

ui->stop->setText(tr("开始"));
ui->stop->setIcon(QIcon(":/res/right3.png"));
ui->stop->setIconSize(QSize(40,40));
timer->stop();
bool active=timer->isActive();
qDebug()<<active;

);

参考技术A 你这代码写的仿佛在做梦追问

百度不给缩进

追答

我说你代码 先判断是否等于开始 然后又设置成停止 然后又判断是否等于开始？能停就怪了

Qt线程下定时做某事

直接在run函数中 while(!m_stop) sleep(2); 为啥要用QTimer呢？搞不懂