Qt自定义控件实现圆圈加载进度条分享！

本文实例为大家分享了Qt实现圆圈加载进度条的具体代码，供大家参考，具体内容如下

先看效果图：

思路：画一个占270度的圆弧，然后定义一个定时器，定时旋转坐标系，实现旋转的效果。圆弧需要使用渐变色，实现颜色越来越浅的效果

关键代码：CMProcessBar1.cpp

  CMProcessBar1::CMProcessBar1(QWidget *parent) :    QWidget(parent),    ui(new Ui::CMProcessBar1)  {    ui->setupUi(this);    QTimer *timer = new QTimer;    connect(timer,QTimer::timeout,this,updaterRotation);// 定时旋转坐标系    timer->start(3);//定时3毫秒  }    CMProcessBar1::~CMProcessBar1()  {    delete ui;  }    void CMProcessBar1::updaterRotation(){ //循环360度旋转坐标系    rotation++;    if(rotation == 360){      rotation = 0;    }    update();  }    void CMProcessBar1::paintEvent(QPaintEvent *event){//根据QPaintPath画出渐变色的圆弧    int width = this->width();    int height = this->height();    int side = qMin(width, height);      QPainter painter(this);    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);    painter.translate(width / 2, height / 2);    painter.scale(side / 200.0, side / 200.0);      QConicalGradient gra(QPoint(0,0),0);    gra.setColorAt(0,QColor("#3BB6FE"));    gra.setColorAt(1,QColor("#FFFFFF"));    QBrush brush(gra);      int radis = 40;    int sider = 5;    QRect rect(-radis,-radis,radis*2,radis*2);    QPainterPath path;    path.arcTo(rect,0, 270);      QPainterPath subPath;    subPath.addEllipse(rect.adjusted(sider, sider, -sider, -sider));      path = path-subPath;    painter.setBrush(brush);//QColor("#66CFFF")    painter.setPen(Qt::NoPen);    painter.rotate(rotation);    painter.drawPath(path);      }

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