Can projects compiled in older versions of Xcode run properly (or at all) on newer version of iOS?
For example, can a project compiled in Xcode 4.2 run on platforms with iOS 8.
Is this possible?
IOS – Can applications compiled with an old version of Xcode run on newer iOS
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Related Solutions
The problem is that Xcode 4.3 ignores the schema you had selected in older versions, and automatically sets it to run on device for iOS projects. Since you don't have an eligible device attached to your computer, you get this error. The fix is simple. In the toolbar, click on the menu which says iOS Device and choose one of the simulator options instead.
XCode 4.2 will run on Snow Leopard and it has ARC support.
Go to Apple Developer Downloads and search for XCode 4.2 for Snow Leopard, it will show up there, at least if you're a registered iOS developer.
Any newer XCode version than 4.2 is not supported by Apple on Snow Leopard, so I suspect you may have problems even if you'd manage to install it.
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Best Answer
If You're not using removed API it should run OK. However some methods behave differently. You can have problems with UI (for example Alerts and Actionsheets now uses different API). If You targeted iOS < 7 then UI will definitely be messed up.
You can check API differences on Apple Developer site (it's iOS 7.1 - 8.0 diff, check the earlier diffs to be sure).
To sum up: if You've been following Apple recomendations while writting code in earlier Xcode for earlier iOS there should not be many problems. But You'll never know until You run and test it.