检测网络是否连接

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// NetworkConnert.h

// Created by CJW on 16/3/10.

#import <Foundation/Foundation.h>

@interface NetworkConnect :NSObject

+ (BOOL)connectedToNetwork; //判断是否有网

@end

// NetworkConnert.m

// Created by CJW on 16/3/10.

#import "NetworkConnect.h"

#import<SystemConfiguration/SCNetworkReachability.h>

@implementation NetworkConnect

+ (BOOL)connectedToNetwork {

//创建零地址，0.0.0.0的地址表示查询本机的网络连接状态

structsockaddr_storage zeroAddress;

bzero(&zeroAddress,sizeof(zeroAddress));

zeroAddress.ss_len =sizeof(zeroAddress);

zeroAddress.ss_family =AF_INET;

// Recover reachability flags

SCNetworkReachabilityRef defaultRouteReachability =SCNetworkReachabilityCreateWithAddress(NULL, (structsockaddr *)&zeroAddress);

SCNetworkReachabilityFlags flags;

//获得连接的标志

BOOL didRetrieveFlags =SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);

CFRelease(defaultRouteReachability);

//如果不能获取连接标志，则不能连接网络，直接返回

if (!didRetrieveFlags)

{

returnNO;

}

//根据获得的连接标志进行判断

BOOL isReachable = flags &kSCNetworkFlagsReachable;

BOOL needsConnection = flags &kSCNetworkFlagsConnectionRequired;

return (isReachable&&!needsConnection) ?YES : NO;

}

@end

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