还是Qt 通过stylesheet或者palette设置背景色的问题

关于Qt，设置一个widget的背景色后，希望子对象不受影响。 很久以前在QtForum上问过一个问题：http://www.qtforum.org/post/94103/setting-background-color-on-widgets-makes-child-widget-wrong-style.html?highlight=#post94103

在stackoverflow上也有类似的问题：http://stackoverflow.com/questions/177778/in-qt-how-do-i-set-the-background-color-of-a-widget-like-combobox-or-double-spin

现在的方法是：

1. 要是设置整个对话框的，就用palette

2. 要是设置某个对象的，就用selector

Class Selector

.QPushButton

Matches instances of QPushButton , but not of its subclasses. This is equivalent to *[class~="QPushButton"] .

或者

ID Selector

QPushButton#okButton

Matches all QPushButton instances whose object name is okButton .