markDown 經常使用語法

早睡早起身體好

一年之計在於春，一天之計在於晨

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- (instancetype)init {
    self = [super init];
    if (self) {
        _networkState = [[AFNetworkReachabilityManager sharedManager] networkReachabilityStatus];
        [[AFNetworkReachabilityManager sharedManager] startMonitoring];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateDidChanged:) name:AFNetworkingReachabilityDidChangeNotification object:nil];
    }
    return self;
}