Convenient wrapper for NSUserDefaults.
- Uses enum values as keys (safe!).
- Uses generics and type inference in order to avoid having to specify the value type, in most cases.
UserDefaults is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod "UserDefaults"
... or copy UserDefaults.swift in your project.
The keys have to comform to the StringRepresentable protocol. Normally you will declare an enum similar to this:
enum MyKeys:String, StringRepresentable {
// give your keys a meaningful name
case Key1 = "key1"
case Key2 = "key2"
case Key3 = "key3"
case Key4 = "key4"
case Key5 = "key5"
var stringValue:String {return self.rawValue}
}Examples:
UserDefaults.setValue(MyKeys.Key1, value: "hello")
let a:String? = UserDefaults.value(MyKeys.Key1)
println("String: \(a)")
UserDefaults.setValue(MyKeys.Key2, value: 2.46)
let b:Double? = UserDefaults.value(MyKeys.Key2)
println("Double: \(b)")
UserDefaults.setValue(MyKeys.Key3, value: 3)
let c:Int? = UserDefaults.value(MyKeys.Key3)
println("Int: \(c)")
UserDefaults.setValue(MyKeys.Key4, value: true)
let d:Bool? = UserDefaults.value(MyKeys.Key4)
println("Bool: \(d)")
// pass as parameter
func foo(a:String?) {}
UserDefaults.setValue(MyKeys.Key5, value: 3)
foo(UserDefaults.value(MyKeys.Key5))
// type inference not possible, use convenience accessors
println("String: \(UserDefaults.string(MyKeys.Key1))")ischuetz
UserDefaults is available under the MIT license. See the LICENSE file for more info.