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There are times when you need to write code that is only applicable when working with the simulator.
As an example, I was recently working with an application that required the user to take a picture with their iPhone. Once the picture was taken the application was to show the image to the user, at which point they would measure the size of an object in the image using various controls (movable lines) and a reference object in the image. Problem is, the simulator does not have much for camera functionality (obviously, there is no lens) so any picture taken shows up as a black image.
To get around this problem, I used the compiler directive below and inside the simulator section I would load an image and use the same throughout the application as if it was created from the camera.
#if TARGET_IPHONE_SIMULATOR
NSLog(@"Running on Simulator");
#else
NSLog(@"Running on Device");
#endif
Working with a directive such as this is really handy as you can move between testing with the simulator and a real device without having to change any code.
Related posts:
- Capture a Screenshot on the iPhone
- Capture iPhone Simulator Screenshots – Open Source Screen Capture Tool
- Where is My Object Retained?
Comments
4 Responses to “Specifying Simulator Only Code”
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it does not work fine for me ..
even if i define the TARGET_IPHONE_SIMULATOR in Makefile
[Reply]
John Muchow Reply:
September 1st, 2009 at 6:43 am
You don’t need to define TARGET_IPHONE_SIMULATOR, this is system defined. Do you receive a compile time error?
[Reply]
yes, you are right, system defined it. But should add this:
#ifdef __APPLE__
#include “TargetConditionals.h”
#endif
[Reply]
John Muchow Reply:
October 10th, 2009 at 7:50 am
Hey Luke,
Interesting…my compiles fine without the TargetConditionals.h include. Wonder if it has to do with an include somewhere else along the way that itself includes TargetConditionals.h.
John
[Reply]