change launch image(default.png)?

i am quite new to iphone development but i have been given a old application and told to change the launch image(default.png)..i tried t开发者_如何学编程o google it but couldn't get much help from it?? how can i change the default image in my old application?? any information regarding it will be really helpful??

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The term is splash screen and I'm sure that's why you weren't seeing any good search results. Here is a good link:

http://adeem.me/blog/2009/06/22/creating-splash-screen-tutorial-for-iphone/

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You can't change it programmatically. You can make a new one and just replace Default.png file with it.