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I installed sdk 4 on my mac.
I need to submit a version which runs on OS 3, and OS 4?
What are my choices? can I install sdk3 again, and submit my app.
If I build with SDK4 is it going to run on devices with OS 3?
I don’t use any feature from OS 4.
While you can set the Base SDK in the target build properties, the latest Xcode only comes with 3.2 annd 4.0 and the former is iPad only. Instead, you need to download an older version of Xcode (3.2.2) to develop for 3.x on the iPhone. You can install different sets of Xcode into different folders other than /Developer. The trick is finding an older version of Xcode. I save my copy (and I highly recommend you always keep 1 or 2 versions around), but they’re not easily linked from the main devloper site. You can go to http://connect.apple.com and find them under Downloads -> Developer Tools.
It’s kind of convoluted. There really ought to be a way to install a base SDK into the latest Xcode release. When Xcode 4 comes out, are we going to have to use the old interface to develop backwards compatible apps?
Details for developing for older firmware have also been covered in a previous thread.