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Cross-Platform Development

TargetConditionals

The system header TargetConditionals.h defines several macros which you can use from C and Objective-C to determine which platform you're using.

#import <TargetConditionals.h>  // imported automatically with Foundation

- (void)doSomethingPlatformSpecific {
#if TARGET_OS_IOS
    // code that is compiled for iPhone / iPhone Simulator
#elif TARGET_OS_MAC && !TARGET_OS_IPHONE
    // code that is compiled for OS X only
#else
    // code that is compiled for other platforms
#endif
}

The values of the macros are:

7.0

When using the iOS 9.1, tvOS 9.0, watchOS 2.0, OS X 10.11 or newer SDKs:

Macro	Mac	iOS	iOS simulator	Watch	Watch simulator	TV	TV simulator
`TARGET_OS_MAC`	1	1	1	1	1	1	1
`TARGET_OS_IPHONE`	0	1	1	1	1	1	1
`TARGET_OS_IOS`	0	1	1	0	0	0	0
`TARGET_OS_WATCH`	0	0	0	1	1	0	0
`TARGET_OS_TV`	0	0	0	0	0	1	1
`TARGET_OS_SIMULATOR`	0	0	1	0	1	0	1
`TARGET_OS_EMBEDDED`	0	1	0	1	0	1	0
`TARGET_IPHONE_SIMULATOR`	0	0	1	0	1	0	1

7.0

When using the iOS 8.4, OS X 10.10, or older SDKs:

Macro	Mac	iOS	iOS simulator
`TARGET_OS_MAC`	1	1	1
`TARGET_OS_IPHONE`	0	1	1
`TARGET_OS_EMBEDDED`	0	1	0
`TARGET_IPHONE_SIMULATOR`	0	0	1

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