Question

我正在尝试从web api获取艺术家信息，并使用返回的数据创建一个新的Artist类，但是我无法将我的类属性设置为返回的数据。这是我的代码

导入基金会 class TrackList {

static var trackService:TrackService?

static func getArtistFromService()-> Artist
{
    // construct the complete URL endpoint ot be called

    //let searchURL = "https://\(siteURL)/?s=\(searchTerm)"
    var searchedartist : Artist

    let searchURL = "http://ws.audioscrobbler.com/2.0/?method=artist.gettoptracks&artist=drake&api_key=d932ba18a79b1739a4d9ba02c63bdb61&format=json"

    // degugging - can test in browser if call is failing
    print ("Web Service call = \(searchURL)")

    // create the Web Service object that will make the call - initialiser
    trackService = TrackService(searchURL)

    // create an operation queue - to allow the web service to be called on a secondary thread...
    let operationQ = OperationQueue()
    //... will only allow one task at a time in queue...
    operationQ.maxConcurrentOperationCount = 1
    //...queue that web service object as the operation object to be run on this thread
    operationQ.addOperation(trackService!)
    //... wait for the operation to complete [Synchronous] - better to use delegation, for [Asynchronous]
    operationQ.waitUntilAllOperationsAreFinished()

    // clear the current list of movies
    // get the raw JSON back from the completed service call [complete dataset]
    let returnedJSON = trackService!.jsonFromResponse

    let artist = returnedJSON?["artist"] as! String
    let bio = returnedJSON?["bio"] as! String

          searchedartist.name = artist
        searchedartist.bio = bio


    // return the main list of Movie objects to caller (UI)

    return searchedartist
}


// for debugging - displays some details of the Movies currently in the main list...

} //类声明结束

班级艺术家 { private（set）var name：String private（set）var bio：String

init?(_ n:String, _ b:String)
{
    name = n
    bio = b

}

convenience init(_ JSONObject:[String:String])
{
    let name = JSONObject["name"]!
    let bio = JSONObject["bio"]!

    self.init(name, bio)!
}

}

Answer 1

你的班级有私人制定者。只需使用返回的数据创建一个新的艺术家：

let artist = returnedJSON.....
let bio = returnedJSON.....

let searchedArtist = Artist(artist, bio)
return searchedArtist

或者只是使用您的便利init。一般来说，我更喜欢使用不可变的模型对象，所以我不会建议公开你的setter的替代方案。

不能分配给属性.... setter in accesible swift 3

1 个答案: