Qt按钮的文字变化实现
要实现的就是点击按钮后，按钮上的文字发生变化。Qt利用信号-槽的方式来响应用户的行为。简单的说，对于用户的任何动作，产生信号交给槽来处理。实现按钮的类为QPushButton，但是QPushButton中没有相应的槽来改变按钮上的文字，所以需要从QPushButton继承一个子类MyButton，在MyButton中实现槽。具体的代码如下：
MyButton.h
#ifndef MYBUTTON_H
#define MYBUTTON_H
#include <QPushButton>
class MyButton : public QPushButton
{
Q_OBJECT
public:
MyButton(QWidget *parent=0);
public slots:
void setButtonText();
};
#endif
MyButton.cpp
#include <QtGui>
#include "myButton.h"
MyButton::MyButton(QWidget *parent) : QPushButton(parent)
{
}
void MyButton::setButtonText()
{
if(this->text() == "More>>>")
setText("More<<<");
else
setText("More>>>");
}
以上，实现了一个能够改变按钮文字的MyButton。在编程过程遇到了undefined reference to ‘vtable for MyButton’的错误，因为开始编译时，忘记在类声明中添加Q_OBJECT，所以生成的makefile不正确。需要重新qmake生成makefile文件。
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