关于布局，布局可以采用绝对定位和布局定位，绝对定位就是直接给出坐标值，但是如果用户改变了窗口大小，比如最大化，如果你自己不做处理，那么窗口上面的这些控件还是在原来位置，并不能随着窗口变化而变化。

QT提供了布局管理器，可以避免这种问题出现，常用的有水平布局，垂直布局，网格布局

在布局管理器中使用addWidget添加一个控件，使用addLayout添加一个子布局

1.水平布局

#include <QApplication>

#include <QPushButton>#include <QHBoxLayout>int main(int argc, char *argv[]){     QApplication app(argc, argv);    QWidget *window = new QWidget;    QPushButton *button1 = new QPushButton("One");    QPushButton *button2 = new QPushButton("Two");    QPushButton *button3 = new QPushButton("Three");    QPushButton *button4 = new QPushButton("Four");    QPushButton *button5 = new QPushButton("Five");    QHBoxLayout *layout = new QHBoxLayout;    layout->addWidget(button1);    layout->addWidget(button2);    layout->addWidget(button3);    layout->addWidget(button4);    layout->addWidget(button5);    window->setLayout(layout);    window->show();    return app.exec();

}

2.垂直布局

#include <QApplication>#include <QPushButton>#include <QHBoxLayout>#include <QVBoxLayout>int main(int argc, char *argv[]){     QApplication app(argc, argv);    QWidget *window = new QWidget;    QPushButton *button1 = new QPushButton("One");    QPushButton *button2 = new QPushButton("Two");    QPushButton *button3 = new QPushButton("Three");    QPushButton *button4 = new QPushButton("Four");    QPushButton *button5 = new QPushButton("Five");    QVBoxLayout *layout = new QVBoxLayout;    layout->addWidget(button1);    layout->addWidget(button2);    layout->addWidget(button3);    layout->addWidget(button4);    layout->addWidget(button5);    window->setLayout(layout);    window->show();    return app.exec();

}

3.网格布局

QGridLayout#include <QApplication>#include <QPushButton>#include <QGridLayout>int main(int argc, char *argv[]){     QApplication app(argc, argv);    QWidget *window = new QWidget;    QPushButton *button1 = new QPushButton("One");    QPushButton *button2 = new QPushButton("Two");    QPushButton *button3 = new QPushButton("Three");    QPushButton *button4 = new QPushButton("Four");    QPushButton *button5 = new QPushButton("Five");    QPushButton *button6 = new QPushButton("Six");    QGridLayout *layout = new QGridLayout;    layout->addWidget(button1, 0 ,0);    layout->addWidget(button2, 0, 1);    layout->addWidget(button3, 1, 0);    layout->addWidget(button4, 1, 1);    layout->addWidget(button5, 2, 0);    layout->addWidget(button6, 2, 1);    window->setLayout(layout);    window->show();    return app.exec();

}

QGridLayout的addWidget有两种重载方法

void addWidget(QWidget *widget, int row, int column)row和colume用于指定它的行和列void addWidget(QWidget *widget, int fromRow, int fromColumn, int rowSpan, int columnSpan)fromRow和fromColumn开始行和列，rowSpan和columeSpan用于指定它占了多行和占了多少列。