本文实例为大家分享了Qt自定义控件实现线条型加载条的具体代码，供大家参考，具体内容如下

上效果图：

思路：先画一个线条，然后旋转坐标系再画其他线条，突出颜色的线条可以画死再旋转，也可以按照角度递增让特定线画突出颜色（这里使用的是这种）。

LoadingBarA::LoadingBarA(QWidget *parent) : QWidget(parent){ timer = new QTimer(this); //定时器 timer->setInterval(50); connect(timer,QTimer::timeout,this,[=](){ if(pointRect<=rectCount){ pointRect++; }else{ pointRect = pointRect%rectCount; } update(); });}void LoadingBarA::paintEvent(QPaintEvent *event){ //重绘事件 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); float degree = 360.0/rectCount; //rectCount:共有多少根线条 for(int i =0;i<rectCount;i++){ painter.rotate(degree); if(i == pointRect - 1){ drawRect(&painter,darkColor); //突出颜色 }else{ drawRect(&painter,lightColor);//非突出颜色 } }}void LoadingBarA::drawRect(QPainter* painter,QColor color){//画线条 painter->save(); painter->setPen(Qt::NoPen); painter->setBrush(color); QRect rect(arcLength,-rectHeight/2,rectWidth,rectHeight); painter->drawRoundedRect(rect,rectHeight/2,rectHeight/2); painter->restore();}void LoadingBarA::setDarkColor(QColor tempColor){ this->darkColor = tempColor; update();}void LoadingBarA::setLightColor(QColor lightColor){ this->lightColor = lightColor; update();}void LoadingBarA::setRectWidth(int l){ this->rectWidth = l; update();}void LoadingBarA::setRectHeight(int l){ this->rectHeight = l; update();}void LoadingBarA::setArcLength(int l){ this->arcLength = l; update();}void LoadingBarA::setRectCount(int l){ this->rectCount = l; update();}void LoadingBarA::startLoading(){ //设置开始 timer->start();}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。