How can I make a iPhone app compatible to 2.2.1 and 3.1 SDK?
问题 I have made some apps in 2.2.1 now when I run the same app in 3.1 it gives errors. Changing the codes is a solution I am not looking for. I am looking for some pre-processor directives that can make my app compatible to both SDKs. Something like #ifdef . Thank You All. 回答1: Similar to How to target a specific iPhone version? You can use this #define to change what you build for each SDK... #if __IPHONE_OS_VERSION_MIN_REQUIRED > __IPHONE_2_2 // iPhone 3.0 code here #endif And do this at run