方法一：

1.在AppDelegate的聲明文件中增加網(wǎng)絡(luò)狀態(tài)屬性：

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (nonatomic, assign, readonly) ReachabilityStatus networkStatus;
@end

2.在AppDelegate的實(shí)現(xiàn)文件中使用RAC監(jiān)聽綁定網(wǎng)絡(luò)狀態(tài)：

- (void)configNetworkStatus {
    [GLobalRealReachability startNotifier];
    
    RAC(self,networkStatus) = [[[[[NSNotificationCenter defaultCenter] rac_addObserverForName: kRealReachabilityChangedNotification object: nil] map:^id(NSNotification *notif) {
        
        return  @([notif.object currentReachabilityStatus]);
        
    }] startWith: @([GLobalRealReachability currentReachabilityStatus])] distinctUntilChanged];
}

方法二：

+ (BOOL)isConnectedToNetwork
{
    // 創(chuàng)建零地址，0.0.0.0的地址表示查詢本機(jī)的網(wǎng)絡(luò)連接狀態(tài)
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;
    
    /**
     *  SCNetworkReachabilityRef: 用來(lái)保存創(chuàng)建測(cè)試連接返回的引用
     *
     *  SCNetworkReachabilityCreateWithAddress: 根據(jù)傳入的地址測(cè)試連接.
     *  第一個(gè)參數(shù)可以為NULL或kCFAllocatorDefault
     *  第二個(gè)參數(shù)為需要測(cè)試連接的IP地址,當(dāng)為0.0.0.0時(shí)則可以查詢本機(jī)的網(wǎng)絡(luò)連接狀態(tài).
     *  同時(shí)返回一個(gè)引用必須在用完后釋放.
     *  PS: SCNetworkReachabilityCreateWithName: 這個(gè)是根據(jù)傳入的網(wǎng)址測(cè)試連接,
     *  第二個(gè)參數(shù)比如為"www.apple.com",其他和上一個(gè)一樣.
     *
     *  SCNetworkReachabilityGetFlags: 這個(gè)函數(shù)用來(lái)獲得測(cè)試連接的狀態(tài),
     *  第一個(gè)參數(shù)為之前建立的測(cè)試連接的引用,
     *  第二個(gè)參數(shù)用來(lái)保存獲得的狀態(tài),
     *  如果能獲得狀態(tài)則返回TRUE，否則返回FALSE
     *
     */
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    
    if (!didRetrieveFlags)
    {
        printf("Error. Could not recover network reachability flagsn");
        return NO;
    }
    
    /**
     *  kSCNetworkReachabilityFlagsReachable: 能夠連接網(wǎng)絡(luò)
     *  kSCNetworkReachabilityFlagsConnectionRequired: 能夠連接網(wǎng)絡(luò),但是首先得建立連接過(guò)程
     *  kSCNetworkReachabilityFlagsIsWWAN: 判斷是否通過(guò)蜂窩網(wǎng)覆蓋的連接,
     *  比如EDGE,GPRS或者目前的3G.主要是區(qū)別通過(guò)WiFi的連接.
     *
     */
    BOOL isReachable = ((flags & kSCNetworkFlagsReachable) != 0);
    BOOL needsConnection = ((flags & kSCNetworkFlagsConnectionRequired) != 0);
    return (isReachable && !needsConnection) ? YES : NO;
}