Merge pull request tonymillion#84 from PatrickNLT/master

Use instancetype keyword to allow subclassing

Reachability.h

@@ -61,15 +61,15 @@ typedef void (^NetworkUnreachable)(Reachability * reachability);
 @property (nonatomic, assign) BOOL reachableOnWWAN;
 
 
-+(Reachability*)reachabilityWithHostname:(NSString*)hostname;
++(instancetype)reachabilityWithHostname:(NSString*)hostname;
 // This is identical to the function above, but is here to maintain
 //compatibility with Apples original code. (see .m)
-+(Reachability*)reachabilityWithHostName:(NSString*)hostname;
-+(Reachability*)reachabilityForInternetConnection;
-+(Reachability*)reachabilityWithAddress:(void *)hostAddress;
-+(Reachability*)reachabilityForLocalWiFi;
++(instancetype)reachabilityWithHostName:(NSString*)hostname;
++(instancetype)reachabilityForInternetConnection;
++(instancetype)reachabilityWithAddress:(void *)hostAddress;
++(instancetype)reachabilityForLocalWiFi;
 
--(Reachability *)initWithReachabilityRef:(SCNetworkReachabilityRef)ref;
+-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref;
 
 -(BOOL)startNotifier;
 -(void)stopNotifier;

Reachability.m

@@ -88,12 +88,12 @@ @implementation Reachability
 
 #pragma mark - Class Constructor Methods
 
-+(Reachability*)reachabilityWithHostName:(NSString*)hostname
++(instancetype)reachabilityWithHostName:(NSString*)hostname
 {
     return [Reachability reachabilityWithHostname:hostname];
 }
 
-+(Reachability*)reachabilityWithHostname:(NSString*)hostname
++(instancetype)reachabilityWithHostname:(NSString*)hostname
 {
     SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(NULL, [hostname UTF8String]);
     if (ref) 
@@ -106,7 +106,7 @@ +(Reachability*)reachabilityWithHostname:(NSString*)hostname
     return nil;
 }
 
-+(Reachability *)reachabilityWithAddress:(void *)hostAddress
++(instancetype)reachabilityWithAddress:(void *)hostAddress
 {
     SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
     if (ref) 
@@ -119,8 +119,8 @@ +(Reachability *)reachabilityWithAddress:(void *)hostAddress
     return nil;
 }
 
-+(Reachability *)reachabilityForInternetConnection 
-{   
++(instancetype)reachabilityForInternetConnection
+{
     struct sockaddr_in zeroAddress;
     bzero(&zeroAddress, sizeof(zeroAddress));
     zeroAddress.sin_len = sizeof(zeroAddress);
@@ -129,7 +129,7 @@ +(Reachability *)reachabilityForInternetConnection
     return [self reachabilityWithAddress:&zeroAddress];
 }
 
-+(Reachability*)reachabilityForLocalWiFi
++(instancetype)reachabilityForLocalWiFi
 {
     struct sockaddr_in localWifiAddress;
     bzero(&localWifiAddress, sizeof(localWifiAddress));
@@ -144,7 +144,7 @@ +(Reachability*)reachabilityForLocalWiFi
 
 // Initialization methods
 
--(Reachability *)initWithReachabilityRef:(SCNetworkReachabilityRef)ref 
+-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref
 {
     self = [super init];
     if (self != nil)