I built this iOS app to watch live cryptocurrency prices update in real time, mostly as a way to practice Swift and working with a REST API. It shows major crypto prices refreshing every second in both US dollars and Canadian dollars.
The data comes from the CoinGecko REST API, and the app re-fetches it once per second so the numbers stay current. Switching which currencies are displayed only takes a couple of lines in the parsing code.
The app calls the CoinGecko API on a one-second timer and updates each label whenever new JSON data comes back.
