Adding #ifdef macros to conditionally compile reachability features only when the SystemConfiguration is available

Author: mattt

AFNetworking/AFHTTPClient.h

@@ -164,9 +164,13 @@ extern NSString * AFQueryStringFromParametersWithEncoding(NSDictionary *paramete
 /**
  Sets a callback to be executed when the network availability of the `baseURL` host changes.
  
- @param block A block object to be executed when the network availability of the `baseURL` host changes.. This block has no return value and takes a single argument, which is `YES` if the host is available, otherwise `NO`. 
+ @param block A block object to be executed when the network availability of the `baseURL` host changes.. This block has no return value and takes a single argument, which is `YES` if the host is available, otherwise `NO`.
+ 
+ @warning This method requires the `SystemConfiguration` framework. Add it in the active target's "Link Binary With Library" build phase, and add `#import <SystemConfiguration/SystemConfiguration.h>` to the header prefix of the project (Prefix.pch).
  */
+#ifdef _SYSTEMCONFIGURATION_H
 - (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))block;
+#endif
 
 ///-------------------------------
 /// @name Managing HTTP Operations

AFNetworking/AFHTTPClient.m

@@ -27,12 +27,15 @@
 #import "AFJSONUtilities.h"
 
 #import <Availability.h>
-#import <SystemConfiguration/SystemConfiguration.h>
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED
 #import <UIKit/UIKit.h>
 #endif
 
+#ifdef _SYSTEMCONFIGURATION_H
+#import <SystemConfiguration/SystemConfiguration.h>
+#endif
+
 static NSString * const kAFMultipartFormLineDelimiter = @"\r\n"; // CRLF
 static NSString * const kAFMultipartFormBoundary = @"Boundary+0xAbCdEfGbOuNdArY";
 
@@ -50,6 +53,12 @@ - (id)initWithStringEncoding:(NSStringEncoding)encoding;
 
 #pragma mark -
 
+#ifdef _SYSTEMCONFIGURATION_H
+typedef SCNetworkReachabilityRef AFNetworkReachabilityRef;
+#else
+typedef id AFNetworkReachabilityRef;
+#endif
+
 typedef void (^AFNetworkReachabilityStatusBlock)(BOOL isNetworkReachable);
 
 static NSUInteger const kAFHTTPClientDefaultMaxConcurrentOperationCount = 4;
@@ -127,7 +136,7 @@ @interface AFHTTPClient ()
 @property (readwrite, nonatomic, retain) NSMutableArray *registeredHTTPOperationClassNames;
 @property (readwrite, nonatomic, retain) NSMutableDictionary *defaultHeaders;
 @property (readwrite, nonatomic, retain) NSOperationQueue *operationQueue;
-@property (readwrite, nonatomic, assign) SCNetworkReachabilityRef networkReachability;
+@property (readwrite, nonatomic, assign) AFNetworkReachabilityRef networkReachability;
 @property (readwrite, nonatomic, copy) AFNetworkReachabilityStatusBlock networkReachabilityStatusBlock;
 @end
 
@@ -195,6 +204,7 @@ - (void)dealloc {
 
 #pragma mark -
 
+#ifdef _SYSTEMCONFIGURATION_H
 static void AFReachabilityCallback(SCNetworkReachabilityRef __unused target, SCNetworkReachabilityFlags flags, void *info) {
     if (info) {
         AFNetworkReachabilityStatusBlock block = (AFNetworkReachabilityStatusBlock)info;
@@ -215,6 +225,7 @@ - (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))bloc
     SCNetworkReachabilitySetCallback(self.networkReachability, AFReachabilityCallback, &context);
     SCNetworkReachabilityScheduleWithRunLoop(self.networkReachability, CFRunLoopGetMain(), (CFStringRef)NSRunLoopCommonModes);
 }
+#endif
 
 #pragma mark -
 

iOS Example/Prefix.pch

@@ -7,4 +7,5 @@
 #ifdef __OBJC__
     #import <UIKit/UIKit.h>
     #import <Foundation/Foundation.h>
+    #import <SystemConfiguration/SystemConfiguration.h>
 #endif