//状态栏是由当前app控制的，首先获取当前app
//type数字对应的网络状态依次是 ： 0 - 无网络 ; 1 - 2G ; 2 - 3G ; 3 - 4G ; 5 - WIFI

   UIApplication *app = [UIApplication sharedApplication];
   
   NSArray *children = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];
   
   int type = 0;
   for (id child in children)
   {
   if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
                  type = [[child valueForKeyPath:@"dataNetworkType"] intValue];
             }
     }
    NSLog(@"----%d", type);