AFN 网络检测

+ (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;
}