Qt 控件渐变隐藏消失

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); m_pGraphicsOpacityEffect = new QGraphicsOpacityEffect(ui->label); m_pGraphicsOpacityEffect->setOpacity(1); ui->label->setGraphicsEffect(m_pGraphicsOpacityEffect); m_pNameAnimation = new QPropertyAnimation(m_pGraphicsOpacityEffect,"opacity",this); m_pNameAnimation->setEasingCurve(QEasingCurve::Linear); m_pNameAnimation->setDuration(2500); } Widget::~Widget() { delete ui; delete m_pGraphicsOpacityEffect; delete m_pNameAnimation; } void Widget::on_pushButton_clicked() { m_pNameAnimation->setStartValue(1); m_pNameAnimation->setEndValue(0); m_pNameAnimation->start(QAbstractAnimation::KeepWhenStopped); }