QTimer.setSingleShot

QTimer.setSingleShot 是一个函数，用于设置 QTimer 对象是否为单次触发模式。当 QTimer 对象被设置为单次触发模式时，它只会触发一次定时器事件，然后停止计时。这个函数接受一个布尔值作为参数，如果参数为 True，则 QTimer 对象被设置为单次触发模式；如果参数为 False，则 QTimer 对象被设置为循环触发模式。

相关问题

self.qtimer = QTimer(self) self.qtimer.setSingleShot(True) self.qtimer.timeout.connect(lambda: self.statistic_label.clear())

这段代码是在 PyQt5 中创建一个 QTimer 对象，设置为单次触发模式，然后将其连接到一个 lambda 表达式上，该表达式会清空一个名为 statistic_label 的 QLabel 对象。这意味着在 QTimer 定时器到期时，会调用 lambda 表达式中的代码，即清空 statistic_label 标签的内容。

qtimer setsingleshot

QTimer is a class in Qt framework which is used to create and manage timers. The setSingleShot() function is a method of QTimer class which is used to set the timer to be a single-shot timer.

A single-shot timer is a timer which fires only once after the specified interval and then stops. It is useful when we want to perform a certain task after a specific delay or after a certain event occurs.

The syntax of the setSingleShot() function is as follows:

void QTimer::setSingleShot(bool singleShot)

where singleShot is a boolean value which specifies whether the timer should be a single-shot timer or not. If it is set to true, then the timer will be a single-shot timer, otherwise it will be a repetitive timer.

For example, the following code snippet creates a single-shot timer which will fire after 5 seconds:

QTimer *timer = new QTimer(this);
timer->setSingleShot(true);
timer->start(5000); // 5000 milliseconds = 5 seconds
connect(timer, &QTimer::timeout, [=]() {
    qDebug() << "Timer expired!";
});

In this example, we create a QTimer object and set it to be a single-shot timer using the setSingleShot(true) function. Then we start the timer with a delay of 5 seconds using the start(5000) function. Finally, we connect the timeout() signal of the timer to a lambda function which will print a message to the console when the timer expires.