運行截圖如下：

關鍵代碼如下：

connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked()));connect(this,SIGNAL(signal_1(QString)),this,SIGNAL(signal_2(QString)));connect(this,SIGNAL(signal_2(QString)),this,SIGNAL(signal_3(QString)));connect(this,SIGNAL(signal_3(QString)),this,SLOT(slot_3(QString)));

下面給出所有的代碼

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void btnClicked();void slot_3(QString msg);signals:void signal_1(QString msg1);void signal_2(QString msg2);void signal_3(QString msg3);private:Ui::Widget *ui; };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h"#include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);this->setWindowTitle(tr("CSDN IT1995"));connect(ui->pushButton,SIGNAL(clicked(bool)),this,SLOT(btnClicked()));connect(this,SIGNAL(signal_1(QString)),this,SIGNAL(signal_2(QString)));connect(this,SIGNAL(signal_2(QString)),this,SIGNAL(signal_3(QString)));connect(this,SIGNAL(signal_3(QString)),this,SLOT(slot_3(QString))); }void Widget::slot_3(QString msg){ui->lineEdit->setText(msg); }void Widget::btnClicked(){emit signal_1(tr("CSDN IT1995")); }Widget::~Widget() {delete ui; }

main.cpp

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

總結

以上是生活随笔為你收集整理的Qt工作笔记-对信号与槽的进一步理解（信号与信号关联）的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。