IOS backward compatibility: how to discover expired Interfaces

Take the following compatibility as an example. Add the following code to the pre-compiled project header file (xx. pch:

 

 #import <Availability.h> #define __AVAILABILITY_INTERNAL__IPHONE_3_2 __AVAILABILITY_INTERNAL_DEPRECATED #define __AVAILABILITY_INTERNAL__IPHONE_4_0 __AVAILABILITY_INTERNAL_DEPRECATED #define __AVAILABILITY_INTERNAL__IPHONE_4_1 __AVAILABILITY_INTERNAL_DEPRECATED #define __AVAILABILITY_INTERNAL__IPHONE_4_2 __AVAILABILITY_INTERNAL_DEPRECATED #define __AVAILABILITY_INTERNAL__IPHONE_4_3 __AVAILABILITY_INTERNAL_DEPRECATED #import <Availability.h>#define __AVAILABILITY_INTERNAL__IPHONE_3_2 __AVAILABILITY_INTERNAL_DEPRECATED#define __AVAILABILITY_INTERNAL__IPHONE_4_0 __AVAILABILITY_INTERNAL_DEPRECATED#define __AVAILABILITY_INTERNAL__IPHONE_4_1 __AVAILABILITY_INTERNAL_DEPRECATED#define __AVAILABILITY_INTERNAL__IPHONE_4_2 __AVAILABILITY_INTERNAL_DEPRECATED#define __AVAILABILITY_INTERNAL__IPHONE_4_3 __AVAILABILITY_INTERNAL_DEPRECATED

Then, compile the program and list the unsupported methods in warning. Check them one by one. Add if ([xx respondToSelector :( deprecatedMethod)]) where the crash may occur. {...} judgment.

You can also add the following code to change warning to error:

 #import <Availability.h> #define __AVAILABILITY_INTERNAL__IPHONE_3_2 __AVAILABILITY_INTERNAL_UNAVAILABLE #define __AVAILABILITY_INTERNAL__IPHONE_4_0 __AVAILABILITY_INTERNAL_UNAVAILABLE #define __AVAILABILITY_INTERNAL__IPHONE_4_1 __AVAILABILITY_INTERNAL_UNAVAILABLE #define __AVAILABILITY_INTERNAL__IPHONE_4_2 __AVAILABILITY_INTERNAL_UNAVAILABLE #define __AVAILABILITY_INTERNAL__IPHONE_4_3 __AVAILABILITY_INTERNAL_UNAVAILABLE #import <Availability.h>#define __AVAILABILITY_INTERNAL__IPHONE_3_2 __AVAILABILITY_INTERNAL_UNAVAILABLE#define __AVAILABILITY_INTERNAL__IPHONE_4_0 __AVAILABILITY_INTERNAL_UNAVAILABLE#define __AVAILABILITY_INTERNAL__IPHONE_4_1 __AVAILABILITY_INTERNAL_UNAVAILABLE#define __AVAILABILITY_INTERNAL__IPHONE_4_2 __AVAILABILITY_INTERNAL_UNAVAILABLE#define __AVAILABILITY_INTERNAL__IPHONE_4_3 __AVAILABILITY_INTERNAL_UNAVAILABLE

Incompatible methods are listed by compilation errors.