iphone - Supporting old iOS versions and devices -


i need ios app compatible previous ios versions, @ least 4.0, , prior devices (iphone 4s, 4, 3gs... , ipad devices). found posts dealing ios versions backwards compatibility have years (for example, how build against older ios versions latest xcode downloads?), , don´t know if deprecated or still way proceed, @ least concerning app building. regarding programming issues, guess should check documentation know if sdk features/libraries/frameworks want use supported ios versions want compatible... , having such information, how check programmatically ios version device running, in order provide feature or not?

on other hand, regarding ios versions , devices running them: find apple document listing ios versions supports each existing device? hardware-dependent issues should take account while developing app?

thanks

edit: target architecture(s) hardware consideration i've take account? knowing that, example, iphone 3gs able run, , running, ios 6.1.3, can assume device support sdk's features, or still need check availability of such features depending on device?

with newest xcode version supports ios 6.0, cannot develope devices ios < 4.3 (lowest base sdk), , version supports ios 4.0 doesn't support ios 6.0. older devices have set architectures armv6 armv7 in project-settings tab "build settings".

for checking ios version running, check available posts here @ stack, find 1 fits ;)

all in 1 set base sdk 5.1 because it's last can used ipad 1 , ipod touch 3. gen. , long enought available should have latest update.

older devices can have ios 4.2.x , not supported current xcode (4.6.2 (4h1003)).


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