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:
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 |
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 |