初学QT，不知道下面的程序窗口为什么显示不了pushbutton，求过路人指点,该如何处理

初学QT，不知道下面的程序窗口为什么显示不了pushbutton，求过路人指点
[size=18px]MessageBoxs.cpp:

C/C++ code

#include "MessageBoxs.h"#include <QtGui>MessageBoxs::MessageBoxs(QWidget *parent):QDialog(parent){        setWindowTitle(tr("Custom test~~"));        QPushButton *PushButton_Custom = new QPushButton("Custom");        PushButton_Custom->setText(tr("Custom.."));        QGridLayout *GridLayout = new QGridLayout;        GridLayout->addWidget(PushButton_Custom,0,1);        GridLayout->setMargin(10);        GridLayout->setSpacing(20);        connect(PushButton_Custom,SIGNAL(clicked()),this,SLOT(Slot_Custom()));}MessageBoxs::~MessageBoxs(){}void MessageBoxs::Slot_Custom(){}

MessageBoxs.h:

C/C++ code

#ifndef MESSAGEBOX_H#define MESSAGEBOX_H#include <QDialog>class MessageBoxs:public QDialog{        Q_OBJECTpublic:        MessageBoxs(QWidget *parent = 0);        ~MessageBoxs();public slots:        void Slot_Custom();};#endif

main.cpp

C/C++ code

#include <qapplication.h>#include <QPushButton>#include "MessageBoxs.h"int main(int argc,char **argv){        QApplication app(argc,argv);        //QPushButton PushButton_Custom("hello world!!");        //PushButton_Custom.show();        MessageBoxs *MessageBoxs_Custom = new MessageBoxs();        MessageBoxs_Custom->show();        return app.exec();}

[/size]

[解决办法]
因为你的MessageBox.cpp中虽然定义了GridLayout，但却没有将它加入到dialog中，修改如下：
MessageBoxs::MessageBoxs(QWidget *parent):QDialog(parent)
{
setWindowTitle(tr("Custom test~~"));

QPushButton *PushButton_Custom = new QPushButton("Custom");
PushButton_Custom->setText(tr("Custom.."));

QGridLayout *GridLayout = new QGridLayout;
GridLayout->addWidget(PushButton_Custom,0,1);
GridLayout->setMargin(10);
GridLayout->setSpacing(20);

this->setLayout(GridLayout);

connect(PushButton_Custom,SIGNAL(clicked()),this,SLOT(Slot_Custom()));
}
属于粗心大意犯的错误...
[解决办法]
1#正解！

至于你说的，在Slot_Custom当中来设置不可行的原因
我觉得
第一：QT当中的界面布局应该是先于某些成员的！
第二：Slot_Custom这个函数只能设定更小的界面布局(就是总体布局的子布局！)。

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