Singleton approach
class TestSingleton {
static let sharedInstance = TestSingleton()
var title = ""
private init() {}
}
let t1 = TestSingleton.sharedInstance
t1.title = "A"
let t2 = TestSingleton.sharedInstance
t2.title = "B"
println(t1.title) // B
println(t2.title) // B