https://www.sdk.cn/news/4148
```
CTCellularData *cellularData = [[CTCellularData alloc]init];
cellularData.cellularDataRestrictionDidUpdateNotifier = ^(CTCellularDataRestrictedState state){
//获取联网状态
switch (state) {
case kCTCellularDataRestricted:
NSLog(@"受限");
break;
case kCTCellularDataNotRestricted:
NSLog(@"不受限");
break;
case kCTCellularDataRestrictedStateUnknown:
NSLog(@"未知");
break;
default:
break;
};
};
```