CALayer 属性doubleSided

UIView.layer.doubleSided = NO;

意思是图层有双面，是否都显示，设置NO意思背面看不到

@property(getter=isDoubleSided) BOOL doubleSided
Description	Determines whether the receiver is displayed when facing away from the viewer. Animatable.
	If NO, the layer is hidden when facing away from the viewer. Defaults to YES.
Availability	iOS (2.0 and later)
Declared	CALayer.h
Reference	CALayer Class Reference
Related	backgroundColor backgroundFilters borderColor borderWidth compositingFilter contentsGravity cornerRadius filters hidden magnificationFilter mask masksToBounds minificationFilter minificationFilterBias opacity shadowColor shadowOffset shadowOpacity shadowPath shadowRadius style
Guides	Core Animation Cookbook Core Animation Programming Guide

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