Added nullability tags to DTReachability

Core/Source/DTReachability/DTReachability.h

@@ -38,7 +38,7 @@
 
 
 // block type for the reachability observers
-typedef void(^DTReachabilityObserverBlock)(DTReachabilityInformation *reachabilityInformation);
+typedef void(^DTReachabilityObserverBlock)(DTReachabilityInformation * _Nonnull reachabilityInformation);
 
 
 /**
@@ -54,22 +54,22 @@ typedef void(^DTReachabilityObserverBlock)(DTReachabilityInformation *reachabili
 
  @returns An initialized DTReachability instance.
  */
-- (instancetype)init;
+- (instancetype _Nonnull)init;
 
 /**
  Returns an initialized DTReachability instance with a given host name
  
  @param hostname The host name to monitor
  @returns An initialized DTReachability instance.
  */
-- (instancetype)initWithHostname:(NSString *)hostname;
+- (instancetype _Nonnull)initWithHostname:(NSString * _Nonnull)hostname;
 
 /**
  Returns a shared DTReachability instance with the default hostname is apple.com. Generally you should use this because each DTReachability instance maintains its own table of observers.
  
  @returns the default DTReachability instance
  */
-+ (DTReachability *)defaultReachability;
++ (DTReachability * _Nonnull)defaultReachability;
 
 
 /**
@@ -78,38 +78,38 @@ typedef void(^DTReachabilityObserverBlock)(DTReachabilityInformation *reachabili
  @param observer An observation block
  @returns An opaque reference to the observer which you can use to remove it
  */
-+ (id)addReachabilityObserverWithBlock:(DTReachabilityObserverBlock)observer __attribute__((deprecated("use -[[DTReachability defaultReachability] addReachabilityObserverWithBlock:]")));
++ (_Nonnull id)addReachabilityObserverWithBlock:(DTReachabilityObserverBlock _Nonnull )observer __attribute__((deprecated("use -[[DTReachability defaultReachability] addReachabilityObserverWithBlock:]")));
 
 
 /**
  Removes a reachability observer.
  @warning use -[[DTReachability defaultReachability] removeReachabilityObserver:]
  @param observer The opaque reference to a reachability observer
  */
-+ (void)removeReachabilityObserver:(id)observer __attribute__((deprecated("use -[[DTReachability defaultReachability] removeReachabilityObserver:]")));
++ (void)removeReachabilityObserver:(id _Nonnull)observer __attribute__((deprecated("use -[[DTReachability defaultReachability] removeReachabilityObserver:]")));
 
 /**
  
  Adds a block to observe network reachability. Every time the reachability flags change this block is invoked. Also once right after adding the observer with the current state.
  @param observer An observation block
  @returns An opaque reference to the observer which you can use to remove it
  */
-- (id)addReachabilityObserverWithBlock:(DTReachabilityObserverBlock)observer;
+- (id _Nonnull)addReachabilityObserverWithBlock:(DTReachabilityObserverBlock _Nonnull)observer;
 
 
 /**
  Removes a reachability observer block from the receiver.
  @param observer The opaque reference to a reachability observer
  */
-- (void)removeReachabilityObserver:(id)observer;
+- (void)removeReachabilityObserver:(id _Nonnull)observer;
 
 
 /**
  Changes the hostname that is monitored for the receiver. All registered observer blocks will be called on reachability changes for the new hostname.
  
  @param hostname The new hostname that is monitored
  */
-- (void)setHostname:(NSString *)hostname;
+- (void)setHostname:(NSString * _Nonnull) hostname;
 
 
 @end