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-time to run code for 3.0 and above:
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if (version >= 3.0){
// iPhone 3.0 code here
}
来源：https://stackoverflow.com/questions/1198129/how-can-i-make-a-iphone-app-compatible-to-2-2-1-and-3-1-sdk