ios - Cache static function result in Swift? -

i have static function generates uicolor object can reused several times throughout application. don't want code run every time, first time , place cache, let subsequent retrieval grab cache. caveat value can change don't want permanently persist value, persist memory if app restarted, grab latest value , use throughout lifecycle.

here function looks like:

class appconfig: nsobject {        static func getglobaltintcolor(alpha: float = 1) -> uicolor! {         let colors = split(somevarfrominfoplist) { $0 == "," }         let red = cgfloat(colors[0].toint() ?? 0) / cgfloat(255)         let green = cgfloat(colors[1].toint() ?? 0) / cgfloat(255)         let blue = cgfloat(colors[2].toint() ?? 0) / cgfloat(255)         return uicolor(red: red, green: green, blue: blue, alpha: cgfloat(alpha))     } } 

i don't want getglobaltintcolor run logic every time. how cache first time , let served rest of app's lifecycle?

you describing static variable rather function. give variable initializer function creates color.

class appconfig: nsobject {     static var alpha : cgfloat = 1     static var globaltintcolor : uicolor = {         // figure out color once, possibly based on `alpha`         return thecolor     }() } 

this works because static var initializer lazy; can depend on alpha , not initialized until ask value first time. moreover, initializer function will not run again thereafter (unless quit , relaunch app), you're looking for.