Testing multiple iOS versions in Simulator

How can I test multiple iOS versions in the Simulator? I can only seem to test iOS 4.1. I would like to be able to test 3.x v开发者_如何学Cersions in the simulator as well.

Cocoa with Love has a good post on how to do this

To allow simulation in 3.1.3, you must install an old version of Xcode. If you are a registered iPhone developer, you can download Xcode 3.1.4 for Leopard with iPhone SDK 3.1.3 or Xcode 3.1.4 for Snow Leopard with iPhone SDK 3.1.3. Be careful to install these in a different location to your Xcode 3.2.3 with iOS3.2/iOS4 (either select a different hard disk or rename your existing /Developer directory before you install).

In the "hardware" menu are options to change the device and the version.

You can install several version of SDK in different path.

To download an older SDK : http://iphonesdkdev.blogspot.com/2010/04/old-versions-of-iphone-sdk.html