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QT添加下拉框_五个板栗的技术博客_51CTO博客
source link: https://blog.51cto.com/u_15515702/5913059
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QT添加下拉框
精选 原创1.在ui界面上有一个名为comboBox_content的下拉框，向其添加四个下拉内容，QModbusDataUnit是QModbusTcpClient的成员
//四种通信内容：线圈（Coil）、离散量输入（Discrete Inputs）、输入寄存器 （Input Registers）
//保持寄存器（Holding Registers）、
ui->comboBox_content->addItem(tr("Coils"), QModbusDataUnit::Coils);
ui->comboBox_content->addItem(tr("Discrete Inputs"), QModbusDataUnit::DiscreteInputs);
ui->comboBox_content->addItem(tr("Input Registers"), QModbusDataUnit::InputRegisters);
ui->comboBox_content->addItem(tr("Holding Registers"), QModbusDataUnit::HoldingRegisters);
//保持寄存器（Holding Registers）、
ui->comboBox_content->addItem(tr("Coils"), QModbusDataUnit::Coils);
ui->comboBox_content->addItem(tr("Discrete Inputs"), QModbusDataUnit::DiscreteInputs);
ui->comboBox_content->addItem(tr("Input Registers"), QModbusDataUnit::InputRegisters);
ui->comboBox_content->addItem(tr("Holding Registers"), QModbusDataUnit::HoldingRegisters);
2，在ui界面上有一个名为comboB的下拉框，向其添加数字
不写代码，直接添加方式：
设置默认指针位置
代码方式：
auto model = new QStandardItemModel(10, 1, this);
for (int i = 0; i < 10; ++i)
model->setItem(i, new QStandardItem(QStringLiteral("%1").arg(i + 1)));
ui->writeSize->setModel(model);
ui->writeSize->setCurrentText("10");
auto model = new QStandardItemModel(10, 1, this);
for (int i = 0; i < 10; ++i)
model->setItem(i, new QStandardItem(QStringLiteral("%1").arg(i + 1)));
ui->writeSize->setModel(model);
ui->writeSize->setCurrentText("10");
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