iOS自带的背景图片

原来这张经典的图和分组表的背景一样，都是背景自带的呀。

self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];

+ (UIColor *)scrollViewTexturedBackgroundColor
Description	Returns the system pattern color used to render the area behind scrollable content.
Returns	The UIColor object.
Availability	iOS (3.2 and later)
Declared	UIInterface.h
Reference	UIColor Class Reference