ios - Is there any way of sharing getter and setter through properties in Swift? -

i'm building helper enable typed access nsuserdefaults properties. this:

struct userdefaults {    private static var standarduserdefaults: nsuserdefaults = {     return nsuserdefaults.standarduserdefaults()   }()    private static let propkey = "prop"   static var prop: bool {     {       return standarduserdefaults.boolforkey(propkey)     }     set {       standarduserdefaults.setbool(newvalue, forkey: propkey)       standarduserdefaults.synchronize()     }   }  } 

this way can have nice syntax reading , writing nsuserdefaults:

userdefaults.prop // read userdefaults.prop = false // write 

the problem there's lot of boilerplate code this, need 10 lines each aditional property.

is there way of reducing amount of lines needed each new property? reusing getter , setter? kind of run time generator?

you can try wrapping actual value in class handles dirty work you:

class wrappeduserdefault<t> {     let key : string     let defaultvalue : t      var value : t {         {             if let value = userdefaults.standarduserdefaults.objectforkey(key) as? t {                 return value             } else {                 return defaultvalue             }         }         set {             if let value = newvalue as? anyobject {                 userdefaults.standarduserdefaults.setvalue(value, forkey: key)             } else {                 userdefaults.standarduserdefaults.removeobjectforkey(key)             }             userdefaults.standarduserdefaults.synchronize()         }     }      init(key:string, defaultvalue:t) {         self.key = key         self.defaultvalue = defaultvalue     } }  struct userdefaults {     static let standarduserdefaults = nsuserdefaults.standarduserdefaults()      static let ready = wrappeduserdefault<bool>(key:"ready", defaultvalue: true)     static let count = wrappeduserdefault<int>(key: "count", defaultvalue: 0) } 

then little bit more code wind with:

userdefaults.count.value++ userdefaults.ready.value = true userdefaults.ready.value 

if verbosity of ready.value bothers you, can hide that, although you're you're having fair amount of copy/paste code:

struct userdefaults {     static let standarduserdefaults = nsuserdefaults.standarduserdefaults()      private static let readywrapper = wrappeduserdefault<bool>(key:"ready", defaultvalue: true)     static var ready : bool {          { return readywrapper.value }          set { readywrapper.value = newvalue }     } } 

at least in case though, copy/paste code trivial, unlikely need altered in future.