iPhone - 在较旧的SDK上进行编译：__ IPHONE_OS_VERSION_MAX_ALLOWED值

Question

I need test some stuff with preprocessor tests to ensure backward compatibility for my app.
To do this, I must use __IPHONE_OS_VERSION_MAX_ALLOWED >= xxx but does someone know where I can find the values to test for each existing SDK ?

Answer 1

If you command-click on __IPHONE_OS_VERSION_MAX_ALLOWED (in Xcode) you'll see the current definition (in AvailabilityInternal.h ) for the current SDK and the older SDK.

They are basically __IPHONE_4_3 , __IPHONE_4_2 , __IPHONE_4_1 , __IPHONE_4_0 , __IPHONE_3_0 , etc.