这篇文章将为大家详细讲解有关Qt如何实现苹果状态切换按钮的方法，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

代码如下

#include "button.h"#include <QDebug> Button::Button(QWidget *parent) : QPushButton(parent){ status = 0; span_length = 0; rl_flag = false; release_flag =true; timeline = new QTimeLine; connect(timeline,SIGNAL(frameChanged(int)),this,SLOT(timeOut(int)));} void Button::paintEvent(QPaintEvent *e){ QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, true); QPen pen; pen.setWidth(2); pen.setColor(QColor(219,219,219)); painter.setPen(pen); painter.setBrush(Qt::green); painter.drawRoundedRect(1,1,this->width()-2,this->height()-2,30,30); painter.setBrush(Qt::white); painter.setPen(pen); if(!rl_flag){ switch(status) { case 0:painter.drawEllipse(1,1,this->height()-3,this->height()-3);break; case 1:painter.drawRoundedRect(1,1,span_length,this->height()-2,30,30);break; case 2:painter.drawEllipse(this->width()+3-this->height(),1,this->height()-3,this->height()-3);rl_flag=true;status=0;break; } }else{ switch(status) { case 0:painter.drawEllipse(this->width()+3-this->height(),1,this->height()-3,this->height()-3);break; case 1:painter.drawRoundedRect(this->width()-1-span_length,1,span_length,this->height()-2,30,30);break; case 2:painter.drawEllipse(1,1,this->height()-3,this->height()-3);rl_flag=false;status=0;break; } }} void Button::drawSpan(QPainter painter,int s){ } void Button::mousePressEvent(QMouseEvent *e){ timeline->setDuration(400); span_length = 0; status=1; if(!rl_flag){ int r1 = this->height()-3; int r2 = (this->width()/4*3)>r1&#63;(this->width()/4*3):r1; timeline->setFrameRange(r1,r2); }else{ int r1 = this->height()-3; int r2 = (this->width()/4*3)>r1&#63;(this->width()/4*3):r1;//(this->width()/4*1)>r1&#63;(this->width()/4*1):r1; timeline->setFrameRange(r1,r2); } timeline->start();} void Button::mouseMoveEvent(QMouseEvent *e){} void Button::mouseReleaseEvent(QMouseEvent *e){ timeline->stop(); status = 2; update();} void Button::timeOut(int x){ status = 1; span_length = x; update();}

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