iOS AFNetworking2.2 setReachabilityStatusChangeBlock检测网络连接状态

AFNetworking2.2 通过setReachabilityStatusChangeBlock 检测全局网络连接状态

需要注意的是        [_sharedClient.reachabilityManager startMonitoring];

一定要加上这句话 开启监听block才会工作（写的时候一直不工作，翻了好久不知道原因，官网也没有介绍，结果进到reachabilityManager类中看了看 才发现有这个方法开启监听）

+ (instancetype)sharedClient {
    static APIClient *_sharedClient = nil;
    static dispatch_once_t onceToken;

    NSString * APIBaseURLString = [NSString stringWithFormat:SERVER_INTERFACES, SERVER_IP];
    ;
    dispatch_once(&onceToken, ^{
        _sharedClient = [[APIClient alloc] initWithBaseURL:[NSURL URLWithString:VWAPIBaseURLString]];
        [_sharedClient setSecurityPolicy:[AFSecurityPolicy policyWithPinningMode:AFSSLPinningModePublicKey]];

        [_sharedClient.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
            switch (status) {
                case AFNetworkReachabilityStatusReachableViaWWAN:
                    [Dialog simpleToast:@"网络已连接"];
                    break;

                case AFNetworkReachabilityStatusReachableViaWiFi:
                    [Dialog simpleToast:@"网络已连接"];

                    break;
                case AFNetworkReachabilityStatusNotReachable:
                    [Dialog simpleToast:@"当前网络不可用,请联系管理员"];
                    break;
                default:
                    break;
            }
        }];
        [_sharedClient.reachabilityManager startMonitoring];

    });

    return _sharedClient;
}

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