下面是部分主要代码，整个项目请读者自行构造。
#include "widget.h" #include "ui_widget.h" #include <QPushButton> #include <QVBoxLayout> #include <QDebug> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); QVBoxLayout *layout = new QVBoxLayout(this); QPushButton *button1 = new QPushButton("button1", this); QPushButton *button2 = new QPushButton("button2", this); QPushButton *button3 = new QPushButton("button3", this); QPushButton *button4 = new QPushButton("button4", this); QPushButton *button5 = new QPushButton("button5", this); QPushButton *button6 = new QPushButton("button6", this); layout->addWidget(button1); layout->addWidget(button2); layout->addWidget(button3); delete button2; delete button3; layout->addWidget(button4); layout->addWidget(button5); layout->addWidget(button6); qDebug() << layout->count(); } Widget::~Widget() { delete ui; } //执行结果为 4，并且显示时，button2 和 button3 都不见了 //说明 layout 会自动完成相应的整理工作。