.h文件

#ifndef VOLUMETOOLBTN_H
#define VOLUMETOOLBTN_H#include <QToolButton>
#include <memory>class VolumeToolBtn : public QToolButton {
Q_OBJECTpublic:explicit VolumeToolBtn(QWidget *parent = nullptr);~VolumeToolBtn() override;void initUi();
protected:void enterEvent(QEnterEvent *event) override;void leaveEvent(QEvent *event) override;
public slots:void onClicked();
private:bool m_isNoVolume = false;std::unique_ptr<QWidget>m_volumeWidget;
};#endif //VOLUMETOOLBTN_H

.cpp文件

#include "VolumeToolBtn.h"VolumeToolBtn::VolumeToolBtn(QWidget *parent):QToolButton(parent),m_volumeWidget(std::make_unique<QWidget>(this))
{initUi();connect(this, &QToolButton::clicked, this, &VolumeToolBtn::onClicked);
}VolumeToolBtn::~VolumeToolBtn() {}void VolumeToolBtn::initUi() {this->setStyleSheet(R"(QToolButton{border-image: url(':///Res/playbar/volume-on-gray.svg');}QToolButton:hover{border-image: url(':///Res/playbar/volume-on-blue.svg');})");
}
。。。。。后面省略

找了半天发现原来是狗屎m_volumeWidget遮住了按钮。。。真是无语，头一回碰到这么奇葩的错误。改为m_volumeWidget(std::make_unique<QWidget>())即可