iphone - Upgrading to a universal app and sdk problem -

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i have iphone app.

i decided upgrade ipad , installed xcode_3.2.3_and_iphone_sdk_4__final.dmg

i upgraded app universal app.

before installation of new sdk, compile iphone app 3.0 sdk. however, after installation, can see iphone device 3.2 adn 4.0 sdks on xcode.

i wonder, if compiled universal app 3.2 sdk can iphones 3.0-1-2 os versions run new universal app?

if can not, there way that?

you can set in project iphone os deployment target fit app.

you find in project > edit project settings > build tab > deployment

according apple ipad programming guide:

when running on ios 3.1.3 or earlier, application must not use symbols introduced in ios 3.2. example, application trying use uisplitviewcontroller class while running in ios 3.1 crash because symbol not available. avoid problem, code must perform runtime checks see if particular symbol available before using it. information how perform needed runtime checks, see “adding runtime checks newer symbols.”


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