Added additional Reachability information to the AFHTTPClient

As discussed by @mattt in #197, this pull request takes a stab at
exposing the Reachability state via an enum property, similar to
Reachability itself.

AFNetworking/AFHTTPClient.h

@@ -37,6 +37,18 @@
 extern NSString * const AFNetworkingReachabilityDidChangeNotification;
 #endif
 
+/**
+ Enum representing the reachability states to the `baseURL` of the `AFHTTPClient.`
+ */
+#ifdef _SYSTEMCONFIGURATION_H
+typedef enum{
+    AFReachabilityStatusUnknown = 0,
+    AFReachabilityStatusUnavilable,
+    AFReachabilityStatusAvailableViaWWAN,
+    AFReachabilityStatusAvailableViaWiFi,
+}AFReachabilityStatus;
+#endif
+
 /**
  Method used to encode parameters into request body. 
  */
@@ -147,6 +159,15 @@ extern NSString * AFQueryStringFromParametersWithEncoding(NSDictionary *paramete
  */
 @property (readonly, nonatomic, retain) NSOperationQueue *operationQueue;
 
+/**
+ The reachability status from the device to the current `baseURL` of the `AFHTTPClient`.
+
+  @warning This property 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
+@property (readonly, nonatomic) AFReachabilityStatus reachabilityStatus;
+#endif
+
 ///---------------------------------------------
 /// @name Creating and Initializing HTTP Clients
 ///---------------------------------------------
@@ -178,12 +199,12 @@ 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 represents the various reachability states from the device to the `baseURL`.
  
  @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;
+- (void)setReachabilityStatusChangeBlock:(void (^)(AFReachabilityStatus reachabilityStatus))block;
 #endif
 
 ///-------------------------------

AFNetworking/AFHTTPClient.m

@@ -57,11 +57,11 @@ static NSString * const kAFMultipartFormBoundary = @"Boundary+0xAbCdEfGbOuNdArY"
 
 #ifdef _SYSTEMCONFIGURATION_H
 typedef SCNetworkReachabilityRef AFNetworkReachabilityRef;
+typedef void (^AFNetworkReachabilityStatusBlock)(AFReachabilityStatus reachabilityStatus);
 #else
 typedef id AFNetworkReachabilityRef;
 #endif
 
-typedef void (^AFNetworkReachabilityStatusBlock)(BOOL isNetworkReachable);
 typedef void (^AFCompletionBlock)(void);
 
 static NSUInteger const kAFHTTPClientDefaultMaxConcurrentOperationCount = 4;
@@ -155,8 +155,10 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 @property (readwrite, nonatomic, retain) NSMutableArray *registeredHTTPOperationClassNames;
 @property (readwrite, nonatomic, retain) NSMutableDictionary *defaultHeaders;
 @property (readwrite, nonatomic, retain) NSOperationQueue *operationQueue;
+#ifdef _SYSTEMCONFIGURATION_H
 @property (readwrite, nonatomic, assign) AFNetworkReachabilityRef networkReachability;
 @property (readwrite, nonatomic, copy) AFNetworkReachabilityStatusBlock networkReachabilityStatusBlock;
+#endif
 
 #ifdef _SYSTEMCONFIGURATION_H
 - (void)startMonitoringNetworkReachability;
@@ -171,8 +173,11 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 @synthesize registeredHTTPOperationClassNames = _registeredHTTPOperationClassNames;
 @synthesize defaultHeaders = _defaultHeaders;
 @synthesize operationQueue = _operationQueue;
+#ifdef _SYSTEMCONFIGURATION_H
 @synthesize networkReachability = _networkReachability;
 @synthesize networkReachabilityStatusBlock = _networkReachabilityStatusBlock;
+@synthesize reachabilityStatus = _reachabilityStatus;
+#endif
 
 + (AFHTTPClient *)clientWithBaseURL:(NSURL *)url {
     return [[[self alloc] initWithBaseURL:url] autorelease];
@@ -220,13 +225,13 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 - (void)dealloc {
 #ifdef _SYSTEMCONFIGURATION_H
     [self stopMonitoringNetworkReachability];
+    [_networkReachabilityStatusBlock release];
 #endif
     
     [_baseURL release];
     [_registeredHTTPOperationClassNames release];
     [_defaultHeaders release];
     [_operationQueue release];
-    [_networkReachabilityStatusBlock release];
     
     [super dealloc];
 }
@@ -243,12 +248,28 @@ static void AFReachabilityCallback(SCNetworkReachabilityRef __unused target, SCN
     BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
     BOOL isNetworkReachable = (isReachable && !needsConnection);
     
+    AFReachabilityStatus status = AFReachabilityStatusUnavilable;
+    if(isNetworkReachable == NO){
+        status = AFReachabilityStatusUnavilable;
+    }
+#if	TARGET_OS_IPHONE
+    else if((flags & kSCNetworkReachabilityFlagsIsWWAN) != 0){
+        status = AFReachabilityStatusAvailableViaWWAN;
+    }
+    else{
+        status = AFReachabilityStatusAvailableViaWiFi;
+    }
+#else
+    else {
+        status = AFReachabilityStatusAvailableViaWiFi;
+    }
+#endif
     AFNetworkReachabilityStatusBlock block = (AFNetworkReachabilityStatusBlock)info;
     if (block) {
-        block(isNetworkReachable);
+        block(status);
     }
         
-    [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingReachabilityDidChangeNotification object:[NSNumber numberWithBool:isNetworkReachable]];
+    [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingReachabilityDidChangeNotification object:[NSNumber numberWithBool:status]];
 }
 
 - (void)startMonitoringNetworkReachability {
@@ -266,8 +287,13 @@ static void AFReachabilityCallback(SCNetworkReachabilityRef __unused target, SCN
     }
 }
 
-- (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))block {
+- (void)setReachabilityStatusChangeBlock:(void (^)(AFReachabilityStatus reachabilityStatus))block {
-    self.networkReachabilityStatusBlock = block;
+    void (^reachabilityCallback)(AFReachabilityStatus reachabilityStatus) = ^(AFReachabilityStatus reachabilityStatus){
+        _reachabilityStatus = reachabilityStatus;
+        if(block)
+            block(reachabilityStatus);
+    };
+    self.networkReachabilityStatusBlock = reachabilityCallback;
     [self startMonitoringNetworkReachability];
 }
 #endif