Swift option错误Method cannot be a

在swift中protocol如果要用optional的话必须在protocol前加@objc，比如说

enum HomeDataRequestStatus {
    case Normal
    case NoNetWork
    case TimeOut
}

@objc protocol HomeDataManagerDelegate:NSObjectProtocol {
    optional func responseforHomeDynamicDataRequest(response:NSArray?,status:HomeDataRequestStatus)
    optional func pageNoforMoreDynamicData() -> Int
}```

但是responseforHomeDynamicDataRequest这个方法会报错

Method cannot be a member of an @objc protocol because the type of the parameter 2 cannot be represented in Objective-C```
是因为该方法中的枚举HomeDataRequestStatus没有@objc，在HomeDataRequestStatus前加上@objc，并加上raw type:Int就可以了

@objc enum HomeDataRequestStatus:Int {
    case Normal
    case NoNetWork
    case TimeOut
}

@objc protocol HomeDataManagerDelegate:NSObjectProtocol {
    optional func responseforHomeDynamicDataRequest(response:NSArray?,status:HomeDataRequestStatus)
    optional func pageNoforMoreDynamicData() -> Int
}```