weak-in-functions.swift

import UIKit

func returnsNil() -> UIView? {
	weak var view: UIView? = UIView()
	return view
}

func returnsView1() -> UIView? {
	weak var view: UIView?
	view = UIView()
	return view
}

func returnsView2() -> UIView? {
	weak var view: UIView?
	var v: UIView? = UIView()
	view = v
	v = nil
	return view
}

var v1: UIView? = UIView()

func returnsView3() -> UIView? {
	weak var view: UIView? = v1
	v1 = nil
	return view
}

var v2: UIView? = UIView()

func returnsView4() -> UIView? {
	weak var view: UIView?
	view = v2
	v2 = nil
	return view
}

returnsNil() // nil
returnsView1() // UIView
returnsView2() // UIView
returnsView3() // UIView
returnsView4() // UIView