5 +(nonnull instancetype)constraintWithLowerOffset:(
CGFloat)newOffset;
6 +(nonnull instancetype)constraintWithUpperOffset:(
CGFloat)newOffset;
7 +(nonnull instancetype)constraintWithRelativeOffset:(
CGFloat)newOffset;
12 -(nonnull instancetype)initWithLowerOffset:(
CGFloat)newOffset;
13 -(nonnull instancetype)initWithUpperOffset:(
CGFloat)newOffset;
14 -(nonnull instancetype)initWithRelativeOffset:(
CGFloat)newOffset;