C++函数可以重名，只要参数不同就行（函数重载）函数承载
    函数参数默认值
    C语言函数不可以重名

    2. void 
    3. addWidget(QWidget *widget, int row, int column, Qt::Alignment alignment = Qt::Alignment())
    4. void 
    5. addWidget(QWidget *widget, int fromRow, int fromColumn, int rowSpan, int columnSpan, Qt::Alignment alignment = Qt::Alignment())
    6. //接受子部件，行号，列号，占行数，占列数，对齐方式（默认居中对齐）

    this在构造函数中代表当前正在被构造的对象

    1. #include "gridlayoutwidget.h"
    2. #include "ui_gridlayoutwidget.h"
    4. gridlayoutWidget::gridlayoutWidget(QWidget *parent) :
    5.     QWidget(parent),
    6.     ui(new Ui::gridlayoutWidget)
    7. {
    8.     //ui->setupUi(this);
    9.     pb1 =new QPushButton("按键1");
    10.     pb2 =new QPushButton("按键2");
    11.     pb3 =new QPushButton("按键3");
    12.     pb4 =new QPushButton("按键4");
    13.     pb5 =new QPushButton("按键5");
    14.     pb6 =new QPushButton("按键6");
    15.     gridlayout = new QGridLayout;
    16.     gridlayout->addWidget(pb1,0,0,1,1);
    17.     gridlayout->addWidget(pb2,0,1,1,1);
    18.     gridlayout->addWidget(pb3,0,2,1,1);
    19.     gridlayout->addWidget(pb4,1,0,1,1,Qt::AlignRight);
    20.     gridlayout->addWidget(pb5,2,2,1,1);
    21.     gridlayout->addWidget(pb6,3,1,1,1);
    23.     this->setLayout(gridlayout);
    24. }
    26. gridlayoutWidget::~gridlayoutWidget()
    27. {
    28.     delete ui;
    29.     delete pb1;
    30.     delete pb2;
    31.     delete pb3;
    32.     delete pb4;
    33.     delete pb5;
    34.     delete pb6;
    35.     delete gridlayout;
    36. }

    窗体布局管理器快捷键设置：中文标签（&快捷键名）；&英文标签快捷键为首字母
    窗体布局管理器：把子窗口按照标签-输入框的形式排列在两列

    1. #include "formwidget.h"
    2. #include "ui_formwidget.h"
    4. formWidget::formWidget(QWidget *parent) :
    5.     QWidget(parent),
    6.     ui(new Ui::formWidget)
    7. {
    8.     ui->setupUi(this);
    11.     formlayout = new QFormLayout;
    13.     name = new QLabel("姓名(&N)：");
    14.     passwd = new QLabel("密码(&P)：");
    15.     male = new QLabel("性别(&F)：");
    17.     namelineEdite =  new QLineEdit;
    18.     passwdlineEdite =  new QLineEdit;
    20.     malecombox = new QComboBox;
    22.     malecombox->addItem("男");
    23.     malecombox->addItem("女");
    25.     name->setBuddy(namelineEdite);
    26.     passwd->setBuddy(passwdlineEdite);
    28.     male->setBuddy(malecombox);
    30.    formlayout->addRow(name,namelineEdite);   //addwidget
    31.    formlayout->addRow(passwd,passwdlineEdite);
    32.    formlayout->addRow(male,malecombox);
    34.    setLayout(formlayout);
    37. }
    39. formWidget::~formWidget()
    40. {
    41.     delete ui;
    42. }