Xcode using schemes to determine dev/staging/production server URLs

Question

I wish to use Xcode's schemes to determine what server to run my app against. I have an app that fetches its information from a server. Like most people I have a development server, a staging server and a production server.

I wish to create a scheme for each of these where Xcode will inject the correct URL. Do I duplicate the run scheme and add environmental variables? Is this the best way to do things, I don't particularly wish to have #ifdef's in my server class and setting it in code each time I change server. Can anyone point me in the right direction please?

FYI: I'm using Xcode 5.0.2 iOS7 SDK.

[EDIT] Everyone gave some great suggestions but I feel @redent84 answer best suits my needs. Though I found it interesting that none actually suggested using different schemes. [/EDIT]

Answer 1

I recommend you to create different XCode Targets for each environment. I recommend you to change the App Identifier of the Apps, for example, the production app would be com.mycompany.App and the DEVEL version would be com.mycompany.App-DEVEL. This way you can track the Apps separately in HockeyApp or TestFlight, and you can have both applications in the same device at the same time.

Then, add Preprocessor Macros that define the environment for every target. DEVEL for development, for example.

If the URL is hardcoded, simply add a #ifdef instruction to choose the URL:

#ifdef DEVEL
#define ENDPOINT_URL @"http://develserver:8080/EndPoint"
#elif defined(STAGING)
#define ENDPOINT_URL @"http://stagingserver:8080/EndPoint"
#else
#define ENDPOINT_URL @"http://app.mycompany.com/EndPoint"
#endif

This way is less error-prone to distribute a development version, easier to maintain and allows you to add custom code to different versions. For example, you may want to include the version number in the login screen or show alert dialogs for development, but not for distribution version.

Answer 2

Use a key in the plist (for each schema, eg: URL_TO_USE), use define to create a 'shortcut' to get the value.

  #define MyURL [[NSBundle mainBundle] objectForInfoDictionaryKey:@"URL_TO_USE"]

EDIT

You must have multiple targets. Each target should point to a different .plist file. See: How to configure independent sets of runtime settings in XCode