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How to write 'instancetype'-like code in Swift
import Foundation
import UIKit
extension UIViewController {
class func fromMainStoryboard () -> UIViewController {
var storyboardID = NSStringFromClass(self)
let dotRangeOptional = storyboardID.rangeOfString(".", options: NSStringCompareOptions.allZeros)
if let dotRange = dotRangeOptional {
storyboardID = storyboardID.substringFromIndex(dotRange.startIndex.successor())
let storyboard = UIStoryboard(name: "Main", bundle: nil)
return storyboard.instantiateViewControllerWithIdentifier(storyboardID) as UIViewController
class SomeViewController: UIViewController {}
let someVC = SomeViewController.fromMainStoryboard() // returns UIViewController ... I want it to be SomeViewController
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