Apple supplied developers with a mechanism for developers to update their apps with through the App Store on the iPhone/iPod Touch. When an update is available, users can either download them through the mobile App Store on their iPhone, or will be prompted to download it in the iTunes Store. One thing they didn’t test is the save data created by the apps.
For example, saved data in games, log-in information in web applications and other data created or stored in the app is lost when updated. This “feature” of updating becomes a major annoyance; especially for those not wanting to start games over again. All that’s needed is for the saved data to be stored in a location away from the app file itself. Currently, the app gets overwritten with the updated app and all personal data within the app is lost (see Is there an iPhone app update bug?). I’m sure Apple are working on a solution for this (possible in the forthcoming iPhone 2.1 update). If not, they need to start now.
Via [TUAW]


















Yikes, that's awful. The firm separation between application and user data is possibly the single best decision Apple ever made for OSX.
Apple need to be a little more transparent and let developers know in advance what their criteria is, and then we wouldn’t waste time having to pander to their whims.
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