SFSafe Symbols

At WWDC 2019, Apple announced a new library of icons that came included with that year's new operating system versions. To browse them, there's a dedicated Mac app called SF Symbols. You can be sure your symbol code won't crash due to typos or symbol availability issues. This is because all symbols are tested via a CI (on the latest iOS & tvOS versions and also some earlier OS versions). Lookups in the SF Symbols app (e. g. about available layersets, available localizations & the look of the symbol) are no longer needed because every symbol is documented in code. Multiple SF Symbols versions are supported at the same time (via utilization of the @availability flag). Each symbol is only made available on those platform versions where Apple says it's available. Renamed symbols can be detected easily (via a deprecation notice which suggests the use of the new name at the same time).