QLabel 通过QPixmap设置图片

1、设置icon本身大小

QLabel* label = new QLabel(this); // Assuming 'this' is a QWidget
QIcon icon(":/path/to/icon.png"); // Replace with your icon path

QPixmap pixmap = icon.pixmap(icon.availableSizes().first());

label->setPixmap(pixmap);

label->setFixedSize(pixmap.size());

2、设置指定大小

QLabel* label = new QLabel(this); // Assuming 'this' is a QWidget
QIcon icon(":/path/to/icon.png"); // Replace with your icon path

// Convert the QIcon to QPixmap
QPixmap pixmap = icon.pixmap(icon.availableSizes().first());

// Set the pixmap to the label
label->setPixmap(pixmap);

// Optional: Adjust the size of the label to the size of the pixmap
label->setFixedSize(pixmap.size());