ios获取网络状态

• Reachability
  较为常用的方法，使用的是系统原生的方法，可以获取网络状态不太详细

typedef NS_ENUM(NSInteger, NetworkStatus) {
    // Apple NetworkStatus Compatible Names.
    NotReachable = 0,              // 未连接
    ReachableViaWiFi = 2,          // wifi
    ReachableViaWWAN = 1           // 蜂窝网
};

使用方法：
-(NetworkStatus)currentReachabilityStatus;  // 获取网络状态
// 判断网络是否连接
-(BOOL)isReachable;
-(BOOL)isReachableViaWWAN;
-(BOOL)isReachableViaWiFi;

• 遍历statusBar获取网络状态

屏幕快照 2016-11-18 下午1.23.24.png

typedef NS_ENUM(NSUInteger, NetworkStates) {
      NetworkStatesNone, // 没有网络
      NetworkStates2G, // 2G
      NetworkStates3G, // 3G
      NetworkStates4G, // 4G
      NetworkStatesWIFI // WIFI
 };

// 判断网络类型
+(NetworkStates)getNetworkStates
{
    NSArray *subviews = [[[[UIApplication sharedApplication] valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];
    // 保存网络状态
    NetworkStates states = NetworkStatesNone;
    for (id child in subviews) {
        if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
            //获取到状态栏码
            int networkType = [[child valueForKeyPath:@"dataNetworkType"] intValue];
            switch (networkType) {
                case 0:
                    states = NetworkStatesNone;
                    //无网模式
                    break;
                case 1:
                    states = NetworkStates2G;
                    break;
                case 2:
                    states = NetworkStates3G;
                    break;
                case 3:
                    states = NetworkStates4G;
                    break;
                case 5:
                {
                    states = NetworkStatesWIFI;
                }
                    break;
                default:
                    break;
            }
        }
    }
    //根据状态选择
    return states;
}