1、概述
型号槽函数时QT框架的一种事件触发机制，比如一个按钮被点击时候，他会发出一个信号。这种发出的信号会使用连接函数，意思就是用来绑定事件和响应的函数进行回调。connect()函数最常用的一般形式：
connect(sender, signal, receiver, slot);参数：
sender：发出信号的对象
signal：发送对象发出的信号
receiver：接收信号的对象
slot：接收对象在接收到信号之后所需要调用的函数
信号槽要求信号和槽的参数一致，所谓一致，是参数类型一致。如果不一致，允许的情况是，槽函数的参数可以比信号的少，即便如此，槽函数存在的那些参数的顺序也必须和信号的前面几个一致起来。这是因为，你可以在槽函数中选择忽略信号传来的数据（也就是槽函数的参数比信号的少），但是不能说信号根本没有这个数据，你就要在槽函数中使用（就是槽函数的参数比信号的多，这是不允许的）。
2、自定义信号与槽
使用connect()可以让我们连接系统提供的信号和槽。但是，Qt 的信号槽机制并不仅仅是使用系统提供的那部分，还会允许我们自己设计自己的信号和槽。
1、申明信号
class Newspaper : public QObject
{
public:
void send()
{
emit newPaper(m_name);
}
signals:
void newPaper(const QString &name);
}
信号的申明需要在类中的signals中申明，signals 块所列出的，就是该类的信号。信号就是一个个的函数名，返回值是 void（因为无法获得信号的返回值，所以也就无需返回任何值），参数是该类需要让外界知道的数据。信号作为函数名，不需要在 cpp 函数中添加任何实现。
语句emit newPaper(m_name);。emit 是 Qt 对 C++ 的扩展，是一个关键字（其实也是一个宏）。emit 的含义是发出，也就是发出newPaper()信号。
2、申明槽函数
class Reader : public QObject
{
Q_OBJECT
public:
void receiveNewspaper(const QString & name)
{
qDebug() << "Receives Newspaper: " << name;
}
}
槽函数和普通函数时一样的。因为这个函数需要接收这个信号，所以首相需要继承这个的类.
3、连接、响应
int main（）
{
Reader reader;
QObject::connect(&newspaper, &Newspaper::newPaper,&reader,&Reader::receiveNewspaper);
newspaper.send();
}
虚函数表达式
QObject::connect(&newspaper, static_cast<void (Newspaper:: )
(const QString &)>(&Newspaper::newPaper),
[=](const QString &name)
{ / Your code here. */ }
);
3、自定义信号槽需要注意的事项
●发送者和接收者都需要是QObject的子类（当然，槽函数是全局函数、Lambda 表达式等无需接收者的时候除外）；
●使用 signals 标记信号函数，信号是一个函数声明，返回 void，不需要实现函数代码；
●槽函数是普通的成员函数，作为成员函数，会受到 public、private、protected 的影响；
●使用 emit 在恰当的位置发送信号；
●使用QObject::connect()函数连接信号和槽。
●任何成员函数、static 函数、全局函数和 Lambda 表达式都可以作为槽函数
4、信号槽函数特殊情况
● 一个信号可以和多个槽相连
如果是这种情况，这些槽会一个接一个的被调用，但是它们的调用顺序是不确定的。
●多个信号可以连接到一个槽
只要任意一个信号发出，这个槽就会被调用。
●一个信号可以连接到另外的一个信号
当第一个信号发出时，第二个信号被发出。除此之外，这种信号-信号的形式和信号-槽的形式没有什么区别。
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