ios 获取网络类型

//获取网络类型
+(NSString *)getNetWorkStates{
UIApplication *app = [UIApplication
sharedApplication];
NSArray *children = [[[app
valueForKeyPath:@"statusBar"]valueForKeyPath:@"foregroundView"]subviews];
NSString *state = [[NSString
alloc]init];

int netType =
0;
//获取到网络返回码
for (id child
in children) {
if ([child
isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
//获取到状态栏
netType = [[child valueForKeyPath:@"dataNetworkType"]intValue];

switch (netType) {
case
0:
state = @"无网络";
//无网模式
break;
case
1:
state = @"2G";
break;
case
2:
state = @"3G";
break;
case
3:
state = @"4G";
break;
case
5:
{
state = @"WIFI";
}
break;
default:
break;
}
NSLog(@"%@",state);
}

}
//根据状态选择
return state;
}
但是这个方法有个bug，wifi'切换到无网络的时候检测不到，希望有大神们有解决的办法告诉我