Adding notifications for network reachability changes to AFHTTPClient

AFNetworking/AFHTTPClient.h

@@ -27,7 +27,18 @@
 @protocol AFMultipartFormData;
 
 /**
- Method used to encode parameters into request body 
+ Posted when network reachability changes.
+ The notification object is an `NSNumber` object containing the boolean value for the current network reachability.
+ This notification contains no information in the `userInfo` dictionary.
+ 
+ @warning In order for network reachability to be monitored, include the `SystemConfiguration` framework 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
+extern NSString * const AFNetworkingReachabilityDidChangeNotification;
+#endif
+
+/**
+ Method used to encode parameters into request body. 
  */
 typedef enum {
     AFFormURLParameterEncoding,

AFNetworking/AFHTTPClient.m

@@ -36,6 +36,8 @@
 #import <SystemConfiguration/SystemConfiguration.h>
 #endif
 
+NSString * const AFNetworkingReachabilityDidChangeNotification = @"com.alamofire.networking.reachability.change";
+
 static NSString * const kAFMultipartFormLineDelimiter = @"\r\n"; // CRLF
 static NSString * const kAFMultipartFormBoundary = @"Boundary+0xAbCdEfGbOuNdArY";
 
@@ -148,6 +150,11 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 @property (readwrite, nonatomic, retain) NSOperationQueue *operationQueue;
 @property (readwrite, nonatomic, assign) AFNetworkReachabilityRef networkReachability;
 @property (readwrite, nonatomic, copy) AFNetworkReachabilityStatusBlock networkReachabilityStatusBlock;
+
+#ifdef _SYSTEMCONFIGURATION_H
+- (void)startMonitoringNetworkReachability;
+- (void)stopMonitoringNetworkReachability;
+#endif
 @end
 
 @implementation AFHTTPClient
@@ -193,6 +200,10 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
     [self setDefaultHeader:@"User-Agent" value:[NSString stringWithFormat:@"%@/%@ (%@)", [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString *)kCFBundleIdentifierKey], [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString *)kCFBundleVersionKey], @"unknown"]];
 #endif
     
+#ifdef _SYSTEMCONFIGURATION_H
+    [self startMonitoringNetworkReachability];
+#endif
+    
     self.operationQueue = [[[NSOperationQueue alloc] init] autorelease];
 	[self.operationQueue setMaxConcurrentOperationCount:kAFHTTPClientDefaultMaxConcurrentOperationCount];
     
@@ -200,14 +211,15 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 }
 
 - (void)dealloc {
+#ifdef _SYSTEMCONFIGURATION_H
+    [self stopMonitoringNetworkReachability];
+#endif
+    
     [_baseURL release];
     [_registeredHTTPOperationClassNames release];
     [_defaultHeaders release];
     [_operationQueue release];
     [_networkReachabilityStatusBlock release];
-    if (_networkReachability) {
-        CFRelease(_networkReachability);
-    }
     
     [super dealloc];
 }
@@ -220,29 +232,37 @@ static NSString * AFPropertyListStringFromParameters(NSDictionary *parameters) {
 
 #ifdef _SYSTEMCONFIGURATION_H
 static void AFReachabilityCallback(SCNetworkReachabilityRef __unused target, SCNetworkReachabilityFlags flags, void *info) {
-    if (info) {
+    BOOL isReachable = ((flags & kSCNetworkReachabilityFlagsReachable) != 0);
-        AFNetworkReachabilityStatusBlock block = (AFNetworkReachabilityStatusBlock)info;
+    BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
-        
+    BOOL isNetworkReachable = (isReachable && !needsConnection);
-        BOOL isReachable = ((flags & kSCNetworkReachabilityFlagsReachable) != 0);
-        BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
-        BOOL isNetworkReachable = (isReachable && !needsConnection);
         
+    AFNetworkReachabilityStatusBlock block = (AFNetworkReachabilityStatusBlock)info;
+    if (block) {
         block(isNetworkReachable);
     }
+        
+    [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingReachabilityDidChangeNotification object:[NSNumber numberWithBool:isNetworkReachable]];
 }
 
-- (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))block {
+- (void)startMonitoringNetworkReachability {
-    if (_networkReachability) {
+    [self stopMonitoringNetworkReachability];
-        SCNetworkReachabilityUnscheduleFromRunLoop(_networkReachability, CFRunLoopGetMain(), (CFStringRef)NSRunLoopCommonModes);
-        CFRelease(_networkReachability);
-    }
-    
-    self.networkReachabilityStatusBlock = block;
     self.networkReachability = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, [[self.baseURL host] UTF8String]);
     SCNetworkReachabilityContext context = {0, self.networkReachabilityStatusBlock, NULL, NULL, NULL};
     SCNetworkReachabilitySetCallback(self.networkReachability, AFReachabilityCallback, &context);
     SCNetworkReachabilityScheduleWithRunLoop(self.networkReachability, CFRunLoopGetMain(), (CFStringRef)NSRunLoopCommonModes);
 }
+
+- (void)stopMonitoringNetworkReachability {
+    if (_networkReachability) {
+        SCNetworkReachabilityUnscheduleFromRunLoop(_networkReachability, CFRunLoopGetMain(), (CFStringRef)NSRunLoopCommonModes);
+        CFRelease(_networkReachability);
+    }
+}
+
+- (void)setReachabilityStatusChangeBlock:(void (^)(BOOL isNetworkReachable))block {
+    self.networkReachabilityStatusBlock = block;
+    [self startMonitoringNetworkReachability];
+}
 #endif
 
 #pragma mark -