Just stumbled across this today. I am getting warnings in Xcode 4.6 if I try to access the CALayer without importing <QuartzCore/QuartzCore.h>. The same however works fine in Xcode 5.
Quartz Core Import not required in Xcode 5?
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Yes,
<QuartzCore/QuartzCore.h>is automatically included, but this seems to be more a side effect than intended, because it is included only indirectly:<UIKit/UIKit.h>includes<UIKit/UISlider.h>,<UIKit/UISlider.h>includes<QuartzCore/QuartzCore.h>, due to new instance variables in theUISliderclass (of theCAShapeLayertype).In addition, Xcode 5 has a new build setting "Link Frameworks Automatically", which is by default on (and requires the new "modules" feature), so that the QuartzCore framework is also added to the link libraries.