求问界面不显示问题
代码很简单
widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
private:
    QPushButton *button;
};
#endif // WIDGET_H

main.cpp

#include <QtGui/QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.resize(500,500);
    a.setActiveWindow(&w);
    w.show();

    return a.exec();
}

widget.cpp

#include "widget.h"
Widget::Widget(QWidget *parent) :
    QWidget(parent)
{
    setMinimumSize(500,250);
    setMaximumSize(500,300);
    resize(500,600);
    button = new QPushButton("Quit");
    button->resize(20,30);
    //this->button->show();
    connect(button,SIGNAL(clicked()),this,SLOT(close()));
}

Widget::~Widget()
{
    delete button;
}

这个widget界面怎么不显示button,加一个button->show(),button会在另一个界面显示出来，刚学，不理解，求解释
[解决办法]

#include "widget.h"
Widget::Widget(QWidget *parent) :
    QWidget(parent)
{
    setMinimumSize(500,250);
    setMaximumSize(500,300);
    resize(500,600);
    button = new QPushButton(this);这里改改
    button->resize(20,30);
    //this->button->show();
    connect(button,SIGNAL(clicked()),this,SLOT(close()));
}

Widget::~Widget()
{
    delete button;
}

[解决办法]

引用:

代码很简单
widget.h
C/C++ code?1234567891011121314151617#ifndef WIDGET_H#define WIDGET_H #include <QWidget>#include <QPushButton> class Widget : public QWidget{ Q_OBJECT public: Widget……

你的button和w没关系啊，要建立关系，可以在new这个button时指定w为其父对象