请教一个关于QSplitter的问题

使用setStretchFactor不起作用

不起作用

四楼的意见，只保留this->mainSplitter->setStretchFactor(1,1);这一句，结果如下：

想问下怎么得到左右两边各占一半的效果

当我动态添加窗口时，
初始状态：

第一次水平添加：

第二次垂直添加：

代码如下：
//--------------------------------------------
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
int num = 0;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow),currentFrame(NULL)
{
ui->setupUi(this);
this->mainSplitter = new QSplitter(this);
this->mainSplitter->setAttribute(Qt::WA_Resized);
this->mainSplitter->setOrientation(Qt::Horizontal);
this->setCentralWidget(this->mainSplitter);
QFrame* frame = this->CreateFrame();
this->currentFrame = frame;
this->mainSplitter->addWidget(frame);
connect(ui->actionHorizontal,SIGNAL(triggered(bool)),this,SLOT(AddSplitterHorizontal()));
connect(ui->actionVertical,SIGNAL(triggered(bool)),this,SLOT(AddSplitterVertical()));
}
//----------------------------------------------------------------
MainWindow::~MainWindow()
{
delete ui;
}
//----------------------------------------------------------------
// 水平添加
void MainWindow::AddSplitterHorizontal()
{
QFrame* frame = this->CreateFrame();
QSplitter* splitter = new QSplitter(this);
splitter->setOrientation(Qt::Horizontal);
splitter->setAttribute(Qt::WA_Resized);
QSplitter* parentSplitter = qobject_cast<QSplitter*>(this->currentFrame->parentWidget());
int index = parentSplitter->indexOf(this->currentFrame);
splitter->addWidget(this->currentFrame);
splitter->addWidget(frame);
parentSplitter->insertWidget(index,splitter);
this->currentFrame = frame;
}
//----------------------------------------------------------------
// 垂直添加
void MainWindow::AddSplitterVertical()
{
QFrame* frame = this->CreateFrame();
QSplitter* splitter = new QSplitter(this);
splitter->setOrientation(Qt::Vertical);
splitter->setAttribute(Qt::WA_Resized);
QSplitter* parentSplitter = qobject_cast<QSplitter*>(this->currentFrame->parentWidget());
int index = parentSplitter->indexOf(this->currentFrame);
splitter->addWidget(this->currentFrame);
splitter->addWidget(frame);
parentSplitter->insertWidget(index,splitter);
this->currentFrame = frame;
}
//----------------------------------------------------------------
QFrame* MainWindow::CreateFrame()
{
QFrame* frame = new QFrame(this);
frame->setFrameStyle(QFrame::Box);
frame->setObjectName(QStringLiteral("frame%1").arg(num));
QVBoxLayout* layout = new QVBoxLayout(frame);
QLabel* lab = new QLabel(frame);
//lab->setAlignment(Qt::AlignCenter);
lab->setText(QStringLiteral("frame%1").arg(num));
//layout->addWidget(lab,Qt::AlignCenter);
layout->addWidget(lab);
num++;
return frame;
}//----------------------------------------------------------------

已解决，每次在分割窗口中添加/删除widget后，用 void QSplitter::setSizes(const QList<int> &list)来设置各个子部件的比例