System/Library/Frameworks/MetricKit.framework
MXUnitAveragePixelLuminance.h
Download MXUnitAveragePixelLuminance.h
@interface MXUnitAveragePixelLuminance : NSDimension
@property (class, readonly, copy) MXUnitAveragePixelLuminance *apl;
+ (id)baseUnit;
@end