[英]Serializing Objects with Alamofire and bearer token
在IOS 8,Xcode 6.3和swift項目中,使用出色的Alamofire庫v1.2,我正在嘗試從JSON-API響應序列化對象,我想知道哪種是實現此目標的最佳方法。 我認為以下代碼中的主要問題是:
JSON-API響應為:
hits = [{
"_id" : "5470def9e0c0be27780121d7",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/api-static\/clubs\/5470def9e0c0be27780121d7_180.png",
"name" : "Mondo",
"hasVip" : false,
"location" : {
"city" : "Madrid"
}
}, {
"_id" : "540b2ff281b30f3504a1c72f",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/api-static\/clubs\/540b2ff281b30f3504a1c72f_180.png",
"name" : "Teatro Kapital",
"hasVip" : false,
"location" : {
"address" : "Atocha, 125",
"city" : "Madrid"
}
}, {
"_id" : "540cd44581b30f3504a1c73b",
"imageUrl" : "https:\/\/s3-eu-west-1.amazonaws.com\/api-static\/clubs\/540cd44581b30f3504a1c73b_180.png",
"name" : "Charada",
"hasVip" : false,
"location" : {
"address" : "La Bola, 13",
"city" : "Madrid"
}
}]
通用響應集合序列化:
@objc public protocol ResponseCollectionSerializable {
static func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Self]
}
extension Alamofire.Request {
public func responseCollection<T: ResponseCollectionSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, [T]?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T.collection(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? [T], error)
})
}
}
俱樂部對象類
final class Club: ResponseCollectionSerializable {
@objc static func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Club] {
var clubs = [Club]()
if let representation = representation as? [[String: AnyObject]] {
for representationValue in representation {
let club = Club(JSON: representationValue)
clubs.append(club)
}
}
return clubs
}
let id: String
let name: String
let imageUrl: String
let hasVip: Bool
let location: String
init(JSON: AnyObject) {
id = JSON.valueForKeyPath("id") as! String
name = JSON.valueForKeyPath("name") as! String
imageUrl = JSON.valueForKeyPath("imageUrl") as! String
hasVip = JSON.valueForKeyPath("hasVip") as! Bool
//is OK this implementation?
location = JSON.valueForKeyPath("location") as! String
}
}
視圖控制器類
class ClubsViewController: UIViewController, UITableViewDataSource{
var results: [JSON]? = []
var clubs: [Club]?
@IBOutlet var tableview:UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.loadClubsObjects()
}
func loadClubsObjects(){
var URL = NSURL(string: "https://api.com/v1/clubs")
var mutableURLRequest = NSMutableURLRequest(URL: URL!)
mutableURLRequest.setValue("Content-Type", forHTTPHeaderField: "application/x-www-form-urlencoded")
mutableURLRequest.HTTPMethod = "GET"
mutableURLRequest.setValue("Bearer R01.iNsG3xjv/r1LDkhkGOANPv53xqUFDkPM0en5LIDxx875fBjdUZLn1jtUlKVJqVjsNwDe1Oqu2WuzjpaYbiWWhw==", forHTTPHeaderField: "Authorization")
let manager = Alamofire.Manager.sharedInstance
let request = manager.request(mutableURLRequest)
request.responseCollection { (request, response, clubs: [Club]?, error) in
println("request = \(request)")
println("response = \(response)")
println("clubs = \(clubs)")
println("error = \(error)")
if (json != nil){
var jsonObj = JSON(json!)
if let data = jsonObj["hits"].arrayValue as [JSON]? {
self.results = data
self.tableview.reloadData()
}
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.results?.count ?? 0
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("clubsObjectCell") as! ClubsTableViewCell
cell.clubsObject = self.results?[indexPath.row]
return cell }
}
println(clubs)輸出為:
request = <NSMutableURLRequest: 0x7fd553725870> { URL: https://api.com/v1/clubs }
response = Optional(<NSHTTPURLResponse: 0x7fd553439e20> { URL: https://api.com/v1/clubs } { status code: 200, headers {
"Access-Control-Allow-Headers" = "X-Requested-With, Accept, Origin, Referer, User-Agent, Content-Type, Authorization";
"Access-Control-Allow-Methods" = "GET,PUT,POST,DELETE,OPTIONS";
"Access-Control-Allow-Origin" = "*";
Connection = "keep-alive";
"Content-Encoding" = gzip;
"Content-Type" = "application/json; charset=utf-8";
Date = "Tue, 21 Apr 2015 20:18:07 GMT";
Etag = "W/\"sEDn5KBhpfpInjAtNsF4gQ==\"";
Server = "nginx/1.6.2";
"Transfer-Encoding" = Identity;
Vary = "Accept-Encoding";
"X-Powered-By" = Express;
} })
clubs = Optional([])
error = nil
為了確保您能將ViewController
類的最后幾行更改為以下內容?
request.responseJSON { request, response, json, error in
println(request)
println(response)
println(json)
println(error)
}
我想確保您已經正確設置了請求,並且正在獲得期望的響應。 那肯定是成功的一半。 一旦您可以驗證,就可以處理responseCollection
解析邏輯。
另外,您正在使用什么版本的Xcode和什么版本的Alamofire?
您遇到的問題有兩個方面。
首先,您沒有正確調用您的responseCollection
方法。 您應該改為按以下方式調用它:
request.responseCollection { request, response, clubs: [Club], error in
println("request = \(request)")
println("response = \(response)")
println("clubs = \(clubs)")
println("error = \(error)")
}
然后,這將正確地進入您的Club
班級。
第二個問題是您沒有在Club
對象內部實現collection
方法。 如果沒有真正遍歷整個系列,您將永遠不會得到任何俱樂部。 大致類似以下內容的內容可以使您朝正確的方向前進。
final class Club: ResponseCollectionSerializable {
@objc static func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Club] {
var clubs = [Club]()
if let representation = representation as? [[String: AnyObject]] {
for representationValue in representation {
let club = Club(JSON: representationValue)
clubs.append(club)
}
}
return clubs
}
let id: String
let name: String
let imageUrl: String
let hasVip: Bool
init(JSON: AnyObject) {
id = JSON.valueForKeyPath("id") as! String
name = JSON.valueForKeyPath("name") as! String
imageUrl = JSON.valueForKeyPath("imageUrl") as! String
hasVip = JSON.valueForKeyPath("hasVip") as! Bool
}
}
一旦您的collection
功能實際上遍歷了JSON數組中的所有表示形式的值,您應該會更加幸運。
對於獎勵積分,這里有一些其他技巧可以改善您的代碼。
Club
類中使用失敗的初始化程序,以確保僅在JSON成功解析后才創建對象 responseCollection
完成閉包中更改您的實現,以實際存儲新的Club值並在表視圖中顯示這些Club。 返回到
responseCollection
閉包的對象不再是可與SwiftyJSON一起使用的JSON AnyObject,而是一個Clubs數組。
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