Qt Timer Guide: How to Use QTimer

When using QT timer, typically the following steps need to be followed:

1. Include related header files.

#include <QTimer>

1. Create a timer object.

QTimer *timer = new QTimer(this);

1. Connect the timeout signal of the timer to a slot function.

connect(timer, SIGNAL(timeout()), this, SLOT(update()));

1. Set the timer interval and start the timer.

timer->start(1000); // 每隔1秒触发一次timeout信号

1. Implementing operations that need to be executed periodically in the slot function.

void MyClass::update()
{
    // 在这里写定时执行的代码
}

It is important to note that in Qt, you can use the QObject::connect() function to connect signals and slots, and you can also simplify the connection of signals and slots using Qt’s macro syntax, such as using the SIGNAL() and SLOT() macros.