在Simulator中运行时的条件编译，而不是在设备上运行

Question

Is there a compiler directive I can use to compile a different line of code when targetting the simulator as opposed to my device. Something like:

# IF SIMULATOR
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
# ELSE
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
# END

EDIT

Direct link to docs.

Answer 1

#if TARGET_IPHONE_SIMULATOR
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
#else
[self.imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
#endif

Answer 2

Update: (Deprecated/Obsolete) This only worked for a few years, and does not work any more. (10+ years later)

For the record, here's another method which Apple uses in some of their official Sample Code:

#if TARGET_CPU_ARM
  // Only executes on an iPhone or iPod touch device
  [self.imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
#else
  // Only executes on the Simulator
  [self.imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
#endif

Answer 3

For those looking for a modern Swift solution, the (new) platform condition targetEnvironment provides the definitive answer here. For instance:

#if targetEnvironment(simulator)
self.imagePicker.sourceType = .photoLibrary
#else
self.imagePicker.sourceType = .camera
#endif 

The target environment platform condition feature was introduced by SE-0190 and is available since Swift 4.1 .