按钮按下三秒禁用

void MainWindow::on_pushButton_5_clicked(){// 锁定界面setWidgetsEnabled(ui->centralwidget, false);// 创建一个定时器，等待3秒后解锁界面QTimer::singleShot(3000, this, [=]() {setWidgetsEnabled(ui->centralwidget, true);;//ui->centralwidget这个是全局布局});}// 将界面的所有控件禁用或启用void MainWindow::setWidgetsEnabled(QWidget *widget, bool enabled) {if (widget) {for (auto child : widget->findChildren<QWidget*>()) {if (child->isWidgetType()) {child->setEnabled(enabled);qDebug() << "Widget:" << child->objectName() << "Enabled:" << enabled;}}}}

读写配置文件 

void MainWindow::read_init()
{QSettings settings("myapp.ini", QSettings::IniFormat);if (!settings.contains("server/port")) {// 如果不存在，才写入配置项settings.setValue("server/port", "8080");}server_PortStr = settings.value("server/port").toString();qDebug() << "port:" << server_PortStr;
}

不同文件利用信号和槽通信

发送方

dialog.h

signals:void dataEntered(const QString &data);

dialog.c

emit dataEntered(ipAddress);

接收方

mainwindow.h

private slots:void receiveData(const QString &data);
private:Dialog *dialog;

mainwindow.cpp

MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);dialog= new Dialog();connect(dialog, SIGNAL(dataEntered(QString)), this, SLOT(receiveData(QString)));
}void MainWindow::receiveData(const QString &data) {// 在这里处理接收到的数据server_IP=data;qDebug() << "Received data in MainWindow:" << server_IP;//插入新行int currentRow = ui->tableWidget->rowCount();qDebug() << "currentRow" << currentRow;ui->tableWidget->insertRow(currentRow);// 创建一个 QTableWidgetItem 对象并设置文本QTableWidgetItem *item1 = new QTableWidgetItem(QString::number(currentRow + 1)); // 设置序号QTableWidgetItem *item2 = new QTableWidgetItem(server_IP); // 设置数据// 插入 QTableWidgetItem 到指定行和列ui->tableWidget->setItem(currentRow, 0, item1); // 设置第一列的单元格为序号ui->tableWidget->setItem(currentRow, 1, item2); // 设置第二列的单元格为数据
}

UDP通信

void MainWindow::sendAndReceiveData(const QByteArray &sendData, QByteArray &receivedData, const QString &serverIP) {// 将字符串形式的端口号转换为整数bool ok;quint16 serverPort = server_PortStr.toUShort(&ok);if (!ok) {qDebug() << "Invalid port number:" << server_PortStr;return; // 如果端口号无效，函数直接返回}// 将字符串形式的IP地址转换为QHostAddressQHostAddress serverAddress(serverIP);// 发送数据到服务器udpSocket->writeDatagram(sendData, serverAddress, serverPort);// 接收服务器的回复QByteArray responseData;while (udpSocket->waitForReadyRead()) {responseData.resize(udpSocket->pendingDatagramSize());QHostAddress senderAddress;quint16 senderPort;udpSocket->readDatagram(responseData.data(), responseData.size(), &senderAddress, &senderPort);MainWindow::~MainWindow()
{//关闭套接字，并丢弃写缓冲区中的所有待处理数据。//   udpSocket->abort();delete ui;
}// 将接收到的数据存储到传入的receivedData变量中receivedData = responseData;qDebug() << "Received response from server" << senderAddress.toString() << "on port" << senderPort;qDebug() << "Response Data:" << responseData;}
}

样式表使用方法

在项目文件创建一个文件styles.qss，然后在qt资源文件打开现有文件即可

然后代码加载；

建议要用样式表都用样式表

具体的样式比样式表级别高（具体样式背景影响样式表控件的样式）

加载样式表在main函数里加载

int main(int argc, char *argv[])
{QApplication a(argc, argv);// 加载样式表文件QFile styleFile(":/new/styles.qss"); // 样式表文件的路径if (styleFile.open(QFile::ReadOnly | QFile::Text)) {QTextStream stream(&styleFile);QString style = stream.readAll();a.setStyleSheet(style); // 应用样式表styleFile.close();}MainWindow w;w.show();return a.exec();
}

多线程

class WorkerThread : public QThread
{Q_OBJECT
public:WorkerThread() : shouldStop(false) {}void stopThread() {shouldStop = true;}protected:void run() override {
//运行代码}private:bool shouldStop;};

void MainWindow::on_pushButton_clicked()
{// 创建 WorkerThread 对象并连接 finished 信号workerThread = new WorkerThread;QObject::connect(workerThread, &QThread::finished, [&]() {// 后台线程完成时设置按钮文本ui->pushButton->setEnabled(true);ui->pushButton->setText("刷新状态");// 释放 WorkerThread 对象workerThread->deleteLater();});// 点击按钮后设置按钮文本为 "刷新中..."ui->pushButton->setText("刷新中...");ui->pushButton->setEnabled(false);// 启动后台线程执行循环workerThread->start();}