c++实现qt中的qcombobox发送currentIndexChanged信号
时间: 2024-02-11 15:03:52 浏览: 27
要实现Qt中QComboBox的currentIndexChanged信号,可以使用如下代码:
首先在Qt Designer中将QComboBox拖入窗口中,然后在头文件中声明一个私有变量:
```
private:
QComboBox* comboBox;
```
在构造函数中初始化该变量,并连接currentIndexChanged信号到槽函数:
```
MyClass::MyClass(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MyClass)
{
ui->setupUi(this);
comboBox = new QComboBox(this);
comboBox->addItem("Item 1");
comboBox->addItem("Item 2");
comboBox->addItem("Item 3");
connect(comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(onComboBoxCurrentIndexChanged(int)));
}
```
最后在槽函数中实现相关逻辑:
```
void MyClass::onComboBoxCurrentIndexChanged(int index)
{
qDebug() << "Current index changed: " << index;
}
```
这样当QComboBox的选项改变时,就会触发currentIndexChanged信号,并调用槽函数onComboBoxCurrentIndexChanged。