iOS7 与 iOS8上 uisegementcontrol 设置image不显示问题

http://stackoverflow.com/questions/22407725/ios7-uisegmentcontrol-image-does-not-display

For ios7, the default treatment for images with a segmented control is to colorise them according to the tint properties of the segmented control. To override this behaviour, use the following code

NSArray *itemArray = [NSArray arrayWithObjects:
[[UIImage imageNamed:@"segment1.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],
[[UIImage imageNamed:@"segment2.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal],
nil];