Open Radar

 
Summary:
UIStoryboardSegue's identifier property is of the non-optional String type in Swift. However, failing to assign an identifier in Interface Builder creates a nil identifier, which crashes if inspected in prepareForSegue().

Steps to Reproduce:
Run the attached SegueAndDie project. Key points of this project:

* Two scenes, first has a single button that segues to the second. The segue is not named (different from being blank / empty string: I have never looked at the inspectors for the segue).

* The first scene's ViewController implements prepareForSegue() to look at the identifier:
	if segue.identifier.utf16Count > 0 {
		println ("Oh good, you named your segue");
	}


Expected Results:
App navigates to the second scene

Actual Results:
Crash: EXC_BAD_ACCESS (code=1, address = 0x00)
#2	0x00000001027eff1c in SegueAndDie.ViewController.prepareForSegue (SegueAndDie.ViewController)(ObjectiveC.UIStoryboardSegue, sender : Swift.Optional<Swift.AnyObject>) -> () at /Users/cadamson/dev/apple-buglets/SegueAndDie/SegueAndDie/ViewController.swift:24


Version:
Xcode Version 6.0.1 (6A317)

Notes:
	// this crashes too
	override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
		var identOpt : String? = segue.identifier
		if let ident = identOpt {
			if segue.identifier.utf16Count > 0 {
				println ("Oh good, you named your segue");
			}
		}
	}


Configuration:
Mac Pro Early 2008, OS X 10.9.4

Attachments:
'SegueAndDie.zip' was successfully uploaded.