首页 文章

在Swift中使用Alamofire处理JSON响应

提问于
浏览 次
1

对不起，我的英语不好 ：）

我在Swift中针对iOS应用程序解析Alamofire上的JSON响应时遇到问题 . 我写了一个函数来返回一个JSON响应字符串 . 请求和响应处理我使用Alamofire和JSON处理我使用SwiftyJSON . 在开始时，我声明一个名为 jsonString 的var，其值为 test . 然后，我向REST服务发出请求，并通过单击按钮获取JSON响应 . 这个响应我想用函数 ping(url:String) 返回 . 最后，我打印返回的响应作为测试 . 但是在第一次单击按钮时， ping 的返回值是 test 而不是响应的JSON字符串 . 在第二次单击按钮时，我得到正确的返回值 . 为什么我有这个问题 . Alamofire请求是异步操作吗？我想等待回应 . 如何解决问题以便在第一次点击时获得正确的值而不是 test 作为值？

这是我的代码：

var jsonString:String = "test"

func ping(url:String) -> String {

    Alamofire.request(.GET, url)
        .response {
            (request, response, data, error) -> Void in

            let json = JSONValue(data as? NSData)
            self.jsonString = json.rawJSONString
    }

    return self.jsonString
}

@IBAction func checkOnlineStatus(sender: UIButton) {

    let response:String = ping("http://test.com")

    println(response)}
ios iphone json swift alamofire

4 回答

  • 0

    在第一次单击时，代码

    return self.jsonString

    将运行之前

    .response {
        (request, response, data, error) -> Void in

        let json = JSONValue(data as? NSData)
        self.jsonString = json.rawJSONString
}

    你将在第一次从self.jsonString获得nil，你第二次点击将获得第一次点击的请求数据 .

    如果您使用SwiftyJSON和Alamofire，您可以尝试Alamofire-SwiftyJSON

    回复于
  • 1

    你也可以尝试跑步

    dispatch_sync(dispatch_get_main_queue()) {
  // insert code you need done the first time around - it will wait
}
    回复于
  • 3

    您遇到的问题是您试图同步返回异步方法的结果 .

    你有两个解决方案：

    • 异步返回结果

    • 等待异步调用完成

    我've written a response to this very same question a few minutes ago on this thread, I' ll建议你看一下：https://stackoverflow.com/a/33130512/422288

    回复于
  • 0
    pod 'Alamofire' 
pod 'SwiftyJSON' 
pod 'ReachabilitySwift'

import UIKit import Alamofire import SwiftyJSON import SystemConfiguration

class WebServiceHelper: NSObject {

typealias SuccessHandler = (JSON) -> Void
typealias FailureHandler = (Error) -> Void

// MARK: - Internet Connectivity

class func isConnectedToNetwork() -> Bool {

    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
    zeroAddress.sin_family = sa_family_t(AF_INET)

    guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
        $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
            SCNetworkReachabilityCreateWithAddress(nil, $0)
        }
    }) else {
        return false
    }

    var flags: SCNetworkReachabilityFlags = []
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
        return false
    }

    let isReachable = flags.contains(.reachable)
    let needsConnection = flags.contains(.connectionRequired)

    return (isReachable && !needsConnection)
}

// MARK: - Helper Methods

class func getWebServiceCall(_ strURL : String, isShowLoader : Bool, success : @escaping SuccessHandler, failure : @escaping FailureHandler)
{
    if isConnectedToNetwork() {

        print(strURL)

        if isShowLoader == true {

            AppDelegate.getDelegate().showLoader()
        }

        Alamofire.request(strURL).responseJSON { (resObj) -> Void in

            print(resObj)

            if resObj.result.isSuccess {
                let resJson = JSON(resObj.result.value!)

                if isShowLoader == true {
                    AppDelegate.getDelegate().dismissLoader()
                }

                debugPrint(resJson)
                success(resJson)
            }
            if resObj.result.isFailure {
                let error : Error = resObj.result.error!

                if isShowLoader == true {
                    AppDelegate.getDelegate().dismissLoader()
                }
                debugPrint(error)
                failure(error)
            }
        }
    }else {


        CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
    }
}

class func getWebServiceCall(_ strURL : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler,  failure :@escaping FailureHandler){
    if isConnectedToNetwork() {

        if isShowLoader == true {
            AppDelegate.getDelegate().showLoader()
        }


        Alamofire.request(strURL, method: .get, parameters: params, encoding: JSONEncoding.default, headers: nil).responseJSON(completionHandler: {(resObj) -> Void in

            print(resObj)

            if resObj.result.isSuccess {
                let resJson = JSON(resObj.result.value!)

                if isShowLoader == true {
                    AppDelegate.getDelegate().dismissLoader()
                }

                success(resJson)
            }
            if resObj.result.isFailure {
                let error : Error = resObj.result.error!

                if isShowLoader == true {
                    AppDelegate.getDelegate().dismissLoader()
                }

                failure(error)
            }

        })
    }
else {

        CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
}

}



class func postWebServiceCall(_ strURL : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler, failure :@escaping FailureHandler)
{
    if isConnectedToNetwork()
    {

        if isShowLoader == true
        {
            AppDelegate.getDelegate().showLoader()
        }

        Alamofire.request(strURL, method: .post, parameters: params, encoding: JSONEncoding.default, headers: nil).responseJSON(completionHandler: {(resObj) -> Void in

            print(resObj)

            if resObj.result.isSuccess
            {
                let resJson = JSON(resObj.result.value!)

                if isShowLoader == true
                {
                    AppDelegate.getDelegate().dismissLoader()
                }

                success(resJson)
            }

            if resObj.result.isFailure
            {
                let error : Error = resObj.result.error!

                if isShowLoader == true
                {
                    AppDelegate.getDelegate().dismissLoader()
                }

                failure(error)
            }
        })
    }else {
        CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
    }
}


class func postWebServiceCallWithImage(_ strURL : String, image : UIImage!, strImageParam : String, params : [String : AnyObject]?, isShowLoader : Bool, success : @escaping SuccessHandler, failure : @escaping FailureHandler)
{
    if isConnectedToNetwork() {
        if isShowLoader == true
        {
            AppDelegate.getDelegate().showLoader()
        }

        Alamofire.upload(
            multipartFormData: { multipartFormData in
                if let imageData = UIImageJPEGRepresentation(image, 0.5) {
                    multipartFormData.append(imageData, withName: "Image.jpg")
                }

                for (key, value) in params! {

                    let data = value as! String

                    multipartFormData.append(data.data(using: String.Encoding.utf8)!, withName: key)
                    print(multipartFormData)
                }
            },
            to: strURL,
            encodingCompletion: { encodingResult in
                switch encodingResult {
                case .success(let upload, _, _):
                    upload.responseJSON { response in
                        debugPrint(response)
                        //let datastring = String(data: response, encoding: String.Encoding.utf8)
                       // print(datastring)
                    }
                case .failure(let encodingError):
                    print(encodingError)
                    if isShowLoader == true
                    {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    let error : NSError = encodingError as NSError
                    failure(error)
                }

                switch encodingResult {
                case .success(let upload, _, _):
                    upload.responseJSON { (response) -> Void in

                        if response.result.isSuccess
                        {
                            let resJson = JSON(response.result.value!)

                            if isShowLoader == true
                            {
                                AppDelegate.getDelegate().dismissLoader()
                            }

                            success(resJson)
                        }

                        if response.result.isFailure
                        {
                            let error : Error = response.result.error! as Error

                            if isShowLoader == true
                            {
                                AppDelegate.getDelegate().dismissLoader()
                            }

                            failure(error)
                        }

                    }
                case .failure(let encodingError):
                    if isShowLoader == true
                    {
                        AppDelegate.getDelegate().dismissLoader()
                    }

                    let error : NSError = encodingError as NSError
                    failure(error)
                }
            }
        )
    }
    else
    {
        CommonMethods.showAlertWithError("", strMessage: Messages.NO_NETWORK, withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
    }
}
}

==================================

    呼叫方法

    让aParams：[String：String] = [“ReqCode”：Constants.kRequestCodeLogin，“StoreDCID”：strStoreID！，“CustEmail”：dictAddLogin [AddLoginConstants.kEmail]！，“Password”：dictAddLogin [AddLoginConstants.kPassword]！，“ DeviceID“：”DeviceIDString“，”DeviceType“：”iOS“，]

    WebServiceHelper.postWebServiceCall(Constants.BaseURL, params: aParams as [String : AnyObject]?, isShowLoader: true, success: { (responceObj) in


            if "\(responceObj["RespCode"])" != "1"
            {
                let alert = UIAlertController(title: Constants.kAppName, message: "\(responceObj["RespMsg"])", preferredStyle: UIAlertControllerStyle.alert)
                let OKAction = UIAlertAction(title: "OK", style: .default) { (action:UIAlertAction!) in
                }
                alert.addAction(OKAction)
                self.present(alert, animated: true, completion: nil)
            }
            else
            {
                let aParams : [String : String] = [
                    "Password" : self.dictAddLogin[AddLoginConstants.kPassword]!,
                    ]
                CommonMethods.saveCustomObject(aParams as AnyObject?, key: Constants.kLoginData)

            }
            }, failure:
            { (error) in

                CommonMethods.showAlertWithError(Constants.kALERT_TITLE_Error, strMessage: error.localizedDescription,withTarget: (AppDelegate.getDelegate().window!.rootViewController)!)
        })
    }
    回复于

相关问题