关于Qt 信号与槽自动连接 qPushbutton按钮无法点击的问题

#ifndef TEST_H

#define TEST_H

#include 

#include 

namespace Ui {

class test;

}

class test : public QMainWindow

{

    Q_OBJECT

public:

    explicit test(QWidget *parent = 0);

    ~test();

private slots:

    void on_button_clicked();

private:

    Ui::test *ui;

    QPushButton *button = nullptr;

};

#include "test.h"

#include "ui_test.h"

#include 

test::test(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::test)

{

    ui->setupUi(this);

    button = new QPushButton(this); // 创建按钮

    button->setObjectName("button");           // 指定按钮的对象

    button->setText(QApplication::translate("test", "myButton", Q_NULLPTR));

    QMetaObject::connectSlotsByName(this);

    qDebug() << children();    // 输出所有子部件的列表

}

void test::on_button_clicked()

{   

       qDebug("signal and solt connected automatic\n");

}

1. ui->setupUi(this); 一定要放在前面，

2.button创建后，一定要指定button的 Object Name

3.objectName 设置的什么名字，槽函数为on_(ObjectNmae)_clicked();格式

4.button属性设置完毕后  一定要调用 QMetaObject::connectSlotsByName(this);

          Searches recursively for all child objects of the givenobject, and connects matching signals from them to slots ofobject that follow the following form: