1 AFNetworkReachabilityManager属性及方法

@interface AFNetworkReachabilityManager : NSObject

/**
 The current network reachability status.
 */
@property (readonly, nonatomic, assign) AFNetworkReachabilityStatus networkReachabilityStatus;

/**
 Whether or not the network is currently reachable.
 */
@property (readonly, nonatomic, assign, getter = isReachable) BOOL reachable;

/**
 Whether or not the network is currently reachable via WWAN.
 */
@property (readonly, nonatomic, assign, getter = isReachableViaWWAN) BOOL reachableViaWWAN;

/**
 Whether or not the network is currently reachable via WiFi.
 */
@property (readonly, nonatomic, assign, getter = isReachableViaWiFi) BOOL reachableViaWiFi;

///---------------------
/// @name Initialization
///---------------------

/**
 Returns the shared network reachability manager.
 */
+ (instancetype)sharedManager;

/**
 Creates and returns a network reachability manager with the default socket address.
 
 @return An initialized network reachability manager, actively monitoring the default socket address.
 */
+ (instancetype)manager;

/**
 Creates and returns a network reachability manager for the specified domain.

 @param domain The domain used to evaluate network reachability.

 @return An initialized network reachability manager, actively monitoring the specified domain.
 */
+ (instancetype)managerForDomain:(NSString *)domain;

/**
 Creates and returns a network reachability manager for the socket address.

 @param address The socket address (`sockaddr_in6`) used to evaluate network reachability.

 @return An initialized network reachability manager, actively monitoring the specified socket address.
 */
+ (instancetype)managerForAddress:(const void *)address;

/**
 Initializes an instance of a network reachability manager from the specified reachability object.

 @param reachability The reachability object to monitor.

 @return An initialized network reachability manager, actively monitoring the specified reachability.
 */
- (instancetype)initWithReachability:(SCNetworkReachabilityRef)reachability NS_DESIGNATED_INITIALIZER;

///--------------------------------------------------
/// @name Starting & Stopping Reachability Monitoring
///--------------------------------------------------

/**
 Starts monitoring for changes in network reachability status.
 */
- (void)startMonitoring;

/**
 Stops monitoring for changes in network reachability status.
 */
- (void)stopMonitoring;

///-------------------------------------------------
/// @name Getting Localized Reachability Description
///-------------------------------------------------

/**
 Returns a localized string representation of the current network reachability status.
 */
- (NSString *)localizedNetworkReachabilityStatusString;

///---------------------------------------------------
/// @name Setting Network Reachability Change Callback
///---------------------------------------------------

/**
 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 represents the various reachability states from the device to the `baseURL`.
 */
- (void)setReachabilityStatusChangeBlock:(nullable void (^)(AFNetworkReachabilityStatus status))block;

@end

2 AFNetworkReachabilityManager使用方法

AFNetworkReachabilityManager使用比较简单，具体用法如下：

1. 头文件提供方法

/**开始监测
 Starts monitoring for changes in network reachability status.
 */
- (void)startMonitoring;

/**停止监测
 Stops monitoring for changes in network reachability status.
 */
- (void)stopMonitoring;

2. 具体调用

[[AFNetworkReachabilityManager sharedManager] startMonitoring];  // 监控

3. 网络状态改变时，监听的回调有两种方法：

• 通过监听AFNetworkingReachabilityDidChangeNotification这个通知。
• 通过下面这个方法

- (void)setReachabilityStatusChangeBlock:(nullable void (^)(AFNetworkReachabilityStatus status))block;

4. 一些其他使用

//是否连接到wifi
[[AFNetworkReachabilityManager sharedManager] isReachableViaWiFi];