设置选中后的qcheckbox背景色和对勾颜色

您可以使用CSS来设置QCheckBox选中时的背景色和对勾颜色。以下是一个示例：

QCheckBox::indicator:checked {
    background-color: #007acc;
    border: none;
}

QCheckBox::indicator:checked:disabled {
    background-color: #c8c8c8;
    border: none;
}

QCheckBox::indicator:unchecked {
    background-color: transparent;
    border: 1px solid #c8c8c8;
}

QCheckBox::indicator:unchecked:disabled {
    background-color: transparent;
    border: 1px solid #c8c8c8;
}

QCheckBox::indicator:checked::indicator:checked {
    image: url(checked.png);
}

QCheckBox::indicator:unchecked::indicator:unchecked {
    image: url(unchecked.png);
}

其中，`QCheckBox::indicator:checked`设置了选中时的背景色和去掉边框，`QCheckBox::indicator:checked:disabled`设置了选中且不可用时的背景色和去掉边框，`QCheckBox::indicator:unchecked`设置了未选中时的边框颜色，`QCheckBox::indicator:unchecked:disabled`设置了未选中且不可用时的边框颜色。`QCheckBox::indicator:checked::indicator:checked`设置了选中时的对勾颜色，`QCheckBox::indicator:unchecked::indicator:unchecked`设置了未选中时的对勾颜色。

您可以根据需要自定义这些颜色和图片。