Following last week’s announcement that developers can begin submitting updates for iOS 4 compatibility, updates have now begun to appear on the App Store. Among the first applications boasting iOS 4 compatibility is the popular Dropbox app, which has also received some minor bug fixes as well.
Developers can simply recompile their applications using the iOS 4 SDK to take advantage of the new Fast App Switching feature in iOS 4, allowing applications to be suspended in the background and resumed at their current state, and all applications listing iOS 4 compatibility should at least support this new multitasking feature. Other multitasking capabilities such as Background Task Completion will need to be specifically added by developers and will not necessarily be inherent in iOS 4 compatible applications.
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