Page 375 typo

Halfway down the page, the first use of line


should be in bold type as this is where it is entered

Thanks for pointing this out. There is a mistake here but it is a little different. Instead of:


the non-bold line should be:


activateConstraints(:slight_smile: has the same effect; addConstraints(:slight_smile: has been noted as deprecated in the header file, but not yet in Appleā€™s docs.