Qt 信号在多层次对象间传递 多层嵌套类对象之间信号传递，可能是五层，或多层，子对象要发信号给第一层

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QMovie> #include <QDebug> #include "transmitsignals.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); QMovie *movie = new QMovie(":/haha.gif"); ui->label_scan->setMovie(movie); ui->label_scan->setScaledContents(true); movie->start(); connect(&TransmitSignals::GetInstance(), SIGNAL(sigReWriteOffsetRet(bool)), this, SLOT(on_test_signal(bool))); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_test_signal(bool ret) { qDebug()<<"on_pushButton_clicked"; } void MainWindow::on_pushButton_clicked() { mForm.show(); }