QT中在MainWindow中代码添加控件

感谢 http://blog.csdn.net/noodle123/article/details/8260693

代码如下：

MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    QRadioButton *radio1 = new QRadioButton(tr("&Radio button 1"));    QVBoxLayout *vbox = new QVBoxLayout(this);    vbox->addWidget(radio1);    QWidget *centerWindow = new QWidget(this);    this->setCentralWidget(centerWindow);    centerWindow->setLayout(vbox);}

Note: Creating a main window without a central widget is not supported. You must 
have a central widget even if it is just a placeholder.

QWidget *centerWindow = new QWidget;

    this->setCentralWidget(centerWindow);

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(splitter);

    centerWindow->setLayout(mainLayout);