(iphone) how can I tell I need a 3.0 + iOS installed device when looking at apple doc?

Posted by Eugene on Stack Overflow See other posts from Stack Overflow or by Eugene
Published on 2011-02-14T06:44:11Z Indexed on 2011/02/14 7:25 UTC
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Hi,

I've seen iphone related open source library which says something like,

"You need 4.0+ iOS build environment but the code will run on 3.0+ iOS device."

I wonder how those two requirements can differ and how can I tell a minimum 'device' iOS version which a certain api would need.

For instance I want to use UIGestureRecognizer but the apple doc says it's 3.2+, but I want my app run on 3.12+.

Is there a difference between build os requirement and device os requirement to run an app?

Thank you

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