问题
Possible Duplicate:
Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?
I have developed an app which works on iPhone 4 (iOS 4.3 & 5) (which used during developing). Now I have tried to test on 3GS (iOS 4.3.3) and 3G(iOS 4.2). But app does not load into these devices. I can see following messages on consol when try to deploy to device.
Sat Jan 1 17:27:38 unknown lockdownd[16] <Error>: 2ff68000 handle_connection:
Could not receive USB message #6 from Xcode. Killing connection
Sat Jan 1 17:27:38 unknown com.apple.mobile.lockdown[16] <Notice>: Could not
receive size of message
I have tested on Xcode 4.0.2 as well as 4.2 beta. Restarted devices and MAC but still same. Can anybody know about this issue? Thanks
回答1:
This can come for various reasons. Until now this is are the cases pople have encountered:
- bad cable -> try another one, or hold it really still when programming
- unsuported features mentioned in info.plist -> check plist
- unsuported architecture (by default Xcode4.2 uses standard arch= armv7 ) -> add armv6
回答2:
Check your cable or your device dock. The problem in your console says your material connection is not healthy. Can you perform an itunes synchronization ?
回答3:
Check the frameworks used by you... mostlt it happen that a some of frameworks doesn't work for old devices so they should not be of REQUIRED type but of OPTIONAL. Hope it works for you.
来源：https://stackoverflow.com/questions/6355890/iphone-app-does-not-run-on-old-device-3g-3gs