// 獲取網絡環境的方法+ (NSString *)networktype{  NSArray *subviews = [[[[UIApplication sharedApplication] valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews];  NSNumber *dataNetworkItemView = nil;  for (id subview in subviews) {    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {      dataNetworkItemView = subview;      break;    }  }  switch ([[dataNetworkItemView valueForKey:@"dataNetworkType"]integerValue]) {    case 0:      return @"無服務";    case 1:      return @"2G";    case 2:      return @"3G";    case 3:      return @"4G";    case 4:      return @"LTE";    case 5:      return @"Wifi";    default:      break;  }  return @"";}