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);
}
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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。