Qt connect传参方式及lambda函数传参方式演示

#include "mainwindow.h" #include "ui_mainwindow.h" #include "QMessageBox" MainWindow::~MainWindow() { delete ui; } MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); setWindowTitle("Qt connect 用法测试"); //各种connect用法演示 //1.1 信号、槽均无参数 connect(ui->btNorUnPara, SIGNAL(clicked()), this, SLOT(onbuttonClicked())); // connect(ui->btNorUnPara, QCheckBox::clicked, this, onbuttonClicked); //1.2 信号有参 //connect(ui->btNorPara, QCheckBox::clicked, this, buttonClickeded); //参数列表只能写类型 否则会出现【No such slot错误】导致绑定失败 // connect(ui->btNorPara, SIGNAL(clicked(bool checked)), this, SLOT(onbuttonClickeded(bool checked))); connect(ui->btNorPara, SIGNAL(clicked(bool)), this, SLOT(onbuttonClickeded(bool))); //2.1 connect(ui->btLambdaUnPara, QCheckBox::clicked,[&]{ QMessageBox::information(this,"Tip","【lambda】:the button is clicked"); }); //2.2 connect(ui->btLambdaPara, QCheckBox::clicked,[&](bool bChecked){ if(bChecked) { QMessageBox::information(this,"","【lambda】:check is true"); } else { QMessageBox::information(this,"","【lambda】:check is false"); } }); } void MainWindow::onbuttonClicked() { QMessageBox::information(this,"Tip","【Normal】:the button is clicked"); } void MainWindow::onbuttonClickeded(bool checked) { if(checked) { QMessageBox::information(this,"Normal","【Normal】: checked is true"); } else { QMessageBox::information(this,"Normal","【Normal】: checked is false"); } }