问题
i am having application running on os3.0 i need to adopt this for ios4.0 wat are the major things i hav to take care... how can i do existing application compatable to multitasking?
回答1:
It's all in Apple's developer documentation.
http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html
来源：https://stackoverflow.com/questions/3181314/how-to-do-multitasking-application-in-ios-4-0