结构体排序：

写法一

QList<test> s;test aa;test bb;test cc;aa.num = "14";bb.num = "2";cc.num = "3";s.append(aa);s.append(bb);s.append(cc);qSort(s.begin(), s.end(),[](const test &infoA,const test &infoB){return infoA.num.toDouble() < infoB.num.toDouble();});for(int i = 0; i < s.count() ; i++){qDebug() << s.at(i).num;}

写法二

#include "widget.h"
#include <QApplication>
#include <QtDebug>//排列判断
int compare(const test &infoA,const test &infoB)
{return infoA.num.toDouble() < infoB.num.toDouble();
}int main(int argc, char *argv[])
{QApplication a(argc, argv);QList<test> s;test aa;test bb;test cc;aa.num = "14";bb.num = "2";cc.num = "3";s.append(aa);s.append(bb);s.append(cc);qSort(s.begin(), s.end(),compare);for(int i = 0; i < s.count() ; i++){qDebug() << s.at(i).num;}return a.exec();
}

Qt中可以使用qSort可以对容器排序，助手中有很多示例，大多数关于int、QString的排序，今天这里主要讲解qSort如何对结构体进行排序的。

Qt对整形排序：

QList list;
list << 33 << 12 << 68 << 6 << 12;
qSort(list.begin(), list.end());
// list: [ 6, 12, 12, 33, 68 ]

Qt对字符串排序：

bool caseInsensitiveLessThan(const QString &s1, const QString &s2)
{return s1.toLower() < s2.toLower();
}int doSomething()
{QStringList list;list << "AlPha" << "beTA" << "gamma" << "DELTA";qSort(list.begin(), list.end(), caseInsensitiveLessThan);// list: [ "AlPha", "beTA", "DELTA", "gamma" ]
}

Qt对结构体排序：

struct BarAmount
{int barLevel;  //钢筋级别QString diameter;  //钢筋直径double planAmount;  //计划量double purchaseAmount;  //采购量double amount;  //总量
};

结构体如上所示， 对QList barDataList可通过以下方式进行排序！

void OverdraftControl::sortBarData(QList *barDataList)
{qSort(barDataList->begin(), barDataList->end(), compareBarData);
}

bool compareBarData(const BarAmount &barAmount1, const BarAmount &barAmount2)
{if (barAmount1.barLevel < barAmount2.barLevel){return true;}else if (barAmount1.barLevel > barAmount2.barLevel){return false;}else{QString strDiameter1 = barAmount1.diameter;QString strDiameter2 = barAmount2.diameter;int nCompare = compareDiameterDescription(strDiameter1,strDiameter2);if (nCompare == -1){return true;}else if (nCompare == 1){return false;}else{return true;}}
}

直接调用sortBarData(&barDataList)就可以完成对QList barDataList的排序了！