1、概述
源码放在文章末尾

该项目实现了可以显示帧率的控件，项目demo演示如下所示：

、
项目部分代码如下所示：

#ifndef FPSITEM_H
#define FPSITEM_H#include <QQuickItem>class FpsItem : public QQuickItem
{Q_OBJECTQ_PROPERTY(int fps READ fps NOTIFY fpsChanged)public:FpsItem(QQuickItem *parent = nullptr);int fps() const;signals:void fpsChanged();private:int m_fps = 0;int m_frameCount = 0;
};#endif // FPSITEM_H

#include "fpsitem.h"#include <QQuickWindow>
#include <QTimer>FpsItem::FpsItem(QQuickItem *parent): QQuickItem(parent)
{QTimer *timer = new QTimer(this);connect(timer, &QTimer::timeout, this, [this]{ m_fps = m_frameCount; m_frameCount = 0; emit fpsChanged(); });connect(this, &QQuickItem::windowChanged, this, [this]{if (window())connect(window(), &QQuickWindow::afterRendering, this, [this]{ m_frameCount++; }, Qt::DirectConnection);});timer->start(1000);
}int FpsItem::fps() const
{return m_fps;
}

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