amol-c / currencycalculator Goto Github PK
View Code? Open in Web Editor NEWThis is a KVO proof of concept. Very powerful pattern, especially for binding Views to Model, but poorly designed API by apple. Reasoning at this site, which makes complete sense https://www.mikeash.com/pyblog/key-value-observing-done-right.html. Apart from that, there are other problems with KVO as well.