Qt_0

Qtf.h

#include <QtWidgets/QWidget>
#include "ui_Qtf.h"
#include <QPushButton>
#include "subWidget.h"
class Qtf : public QWidget
{
    
    
	Q_OBJECT
public:
	Qtf(QWidget *parent = Q_NULLPTR);
public slots:
	void myslot();
	void mychange();
	void mydeal();
private:
	QPushButton b1;
	QPushButton *b2;
	QPushButton b3;
	subWidget s;
	Ui::QtfClass ui;
};

main.cpp

#include "Qtf.h"
#include <QtWidgets/QApplication>
#include <QPushButton>
int main(int argc, char *argv[])
{
    
    
	QApplication a(argc, argv);
	Qtf w;
	w.show();
	return a.exec();
}

Qtf.cpp

#include "Qtf.h"

Qtf::Qtf(QWidget *parent)
	: QWidget(parent)
{
    
    
	this->setWindowTitle("老大");
	b1.setParent(this);
	b1.setText("^_^");
	b1.move(100, 100);
	b2 = new QPushButton;
	b2->setParent(this);
	b2->setText("Qt!");
	connect(&b1, SIGNAL(clicked()), this, SLOT(myslot()));
	b3.setParent(this);
	b3.setText("切换窗口");
	b3.move(50, 50);
	
	connect(&b3, SIGNAL(clicked()), this, SLOT(mychange()));
	connect(&s, SIGNAL(mysignal()), this, SLOT(mydeal()));
	this->setFixedSize(400, 300);
	
	ui.setupUi(this);
}
void Qtf::myslot()
{
    
    
	b2->setText("abc");
}
void Qtf::mychange()
{
    
    
	this->hide();
	s.show();
}
void Qtf::mydeal()
{
    
    
	this->show();
	s.hide();
}

subWidget.h

#pragma once
#include <qwidget.h>
#include <QPushButton>
class subWidget :
	public QWidget
{
    
    
	Q_OBJECT
private:
	QPushButton button;
signals:
	void mysignal();
public slots:
	void sendsignal();
public:
	subWidget();
	~subWidget();
};

subWidget.cpp

#include "subWidget.h"
subWidget::subWidget()
{
    
    
	this->setWindowTitle("小弟");
	this->resize(400, 300);
	button.setParent(this);
	button.setText("切换到老大");
	connect(&button, SIGNAL(released()), this, SLOT(sendsignal()));
}
void subWidget::sendsignal()
{
    
    
	emit mysignal();
}
subWidget::~subWidget()
{
    
    
}

信号与槽：
Qt对象之间的通信接口
connect(&b1, SIGNAL(clicked()), this, SLOT(myslot()));
Q_OBJECT:
The Q_OBJECT macro must appear in the private section of a class definition that declares its own signals and slots or that uses other services provided by Qt’s meta-object system.
指定父对象：
一是通过构造函数，一是setparent().
固定窗口大小：
setFixedSize(width,height)

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