iOS11新增功能提供

系统新增了下面几个Api有没有计划提供

- (void)setCustomSpacing:(CGFloat)spacing afterView:(UIView *)arrangedSubview API_AVAILABLE(ios(11.0),tvos(11.0));
- (CGFloat)customSpacingAfterView:(UIView *)arrangedSubview API_AVAILABLE(ios(11.0),tvos(11.0));