iOS Environment-Specific Configuration

Environment.h

//
//  Environment.h
//
//  Created by Hunter Spinks on 7/8/14.
//

#import <Foundation/Foundation.h>

@interface Environment : NSObject {
    NSString *apiBaseUrl;
    NSString *apiKey;
    NSString *facebookAppId;
    NSString *facebookDisplayName;
}

@property (nonatomic, retain) NSString *apiBaseUrl;
@property (nonatomic, retain) NSString *apiKey;
@property (nonatomic, retain) NSString *facebookAppId;
@property (nonatomic, retain) NSString *facebookDisplayName;

+ (Environment *)sharedInstance;

- (BOOL)isProduction;

@end

Environment.m

//
//  Environment.m
//
//  Created by Hunter Spinks on 7/8/14.
//

#import "Environment.h"

@interface Environment()
@property (nonatomic, strong) NSString *configuration;
@end

@implementation Environment

static Environment *sharedInstance = nil;

@synthesize apiBaseUrl;
@synthesize apiKey;
@synthesize facebookAppId;
@synthesize facebookDisplayName;

- (void)initializeSharedInstance
{
    NSBundle *bundle = [NSBundle mainBundle];
    self.configuration = [[bundle infoDictionary] objectForKey:@"Configuration"];
    NSString *environmentsPlistPath = [bundle pathForResource:@"Environments" ofType:@"plist"];
    NSDictionary *environments = [[NSDictionary alloc] initWithContentsOfFile:environmentsPlistPath];
    NSDictionary *environment = [environments objectForKey:self.configuration];
    
    self.apiBaseUrl = [environment valueForKey:@"apiBaseUrl"];
    self.apiKey = [environment valueForKey:@"apiKey"];
    self.facebookAppId = [environment valueForKey:@"facebookAppId"];
    self.facebookDisplayName = [environment valueForKeyPath:@"facebookDisplayName"];
}

+ (Environment *)sharedInstance
{
    @synchronized(self) {
        if (sharedInstance == nil) {
            sharedInstance = [[self alloc] init];
            [sharedInstance initializeSharedInstance];
        }
        return sharedInstance;
    }
}

- (BOOL)isProduction
{
    return [self.configuration isEqualToString:@"Release"] || [self.configuration isEqualToString:@"Debug"];
}

@end

Environments.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Development</key>
	<dict>
		<key>apiBaseUrl</key>
		<string>DEVELOPMENT_API_URL</string>
		<key>facebookAppId</key>
		<string>DEVELOPMENT_APP_ID</string>
		<key>facebookDisplayName</key>
		<string>DEVELOPMENT_DISPLAY_NAME</string>
		<key>apiKey</key>
		<string>DEVELOPMENT_API_KEY</string>
	</dict>
	<key>Staging</key>
	<dict>
		<key>apiBaseUrl</key>
		<string>STAGING_API_URL</string>
		<key>facebookAppId</key>
		<string>STAGING_APP_ID</string>
		<key>facebookDisplayName</key>
		<string>STAGING_DISPLAY_NAME</string>
		<key>apiKey</key>
		<string>STAGING_API_KEY</string>
	</dict>
	<key>Release</key>
	<dict>
		<key>apiBaseUrl</key>
		<string>RELEASE_API_URL</string>
		<key>facebookAppId</key>
		<string>RELEASE_APP_ID</string>
		<key>facebookDisplayName</key>
		<string>RELEASE_DISPLAY_NAME</string>
		<key>apiKey</key>
		<string>RELEASE_API_KEY</string>
	</dict>
	<key>Debug</key>
	<dict>
		<key>apiBaseUrl</key>
		<string>DEBUG_API_URL</string>
		<key>facebookAppId</key>
		<string>DEBUG_APP_ID</string>
		<key>facebookDisplayName</key>
		<string>DEBUG_DISPLAY_NAME</string>
		<key>apiKey</key>
		<string>DEBUG_API_KEY</string>
	</dict>
</dict>
</plist>

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