QT学习（4）-自定义控件：按钮增加值，滑块跟着变化

#include "smallwid.h" #include "ui_smallwid.h" SmallWid::SmallWid(QWidget *parent) : QWidget(parent), ui(new Ui::SmallWid) { ui->setupUi(this); // QSpinBox移动，QSlider跟着移动 void(QSpinBox::* spSignal) (int) = &QSpinBox::valueChanged; connect(ui->spinBox,spSignal, ui->horizontalSlider,&QSlider::setValue); // QSlider滑动，QSpinBox滑动 connect(ui->horizontalSlider, &QSlider::valueChanged, ui->spinBox,&QSpinBox::setValue); } // 设置和获取数字 void SmallWid::setNum(int num) { ui->spinBox->setValue(num); } int SmallWid::getNum() { return ui->spinBox->value(); } SmallWid::~SmallWid() { delete ui; }