Question

我正在使用Xcode 7.1.0在Swift中为IOS制作应用程序

我在一个功能中有一个开关盒。当我放置断点时，我注意到在一个案例中，每次执行大小写时都会执行两行代码。它似乎只是一行，其余的只执行一次（就像它应该的那样）。

jsonobject的行只执行一次。具有saveCurrentMeasurementDetailsToCoreData函数的行将执行两次。

这怎么可能？

这是我的代码：

private func apiReceivedDetailData(state: ApiCall.ApiState, data : AnyObject){
    switch state{
    case ApiCall.ApiState.Successful:

        // Put the values in the researchmodel and update the table with this global measurement information
        let jsonObject : NSObject = data as! NSObject


        //save all data of current measurement to CoreData
        MeasurementRepository.Instance.saveCurrentMeasurementDetailsToCoreData()

    case ApiCall.ApiState.InvalidCredentials:
        showFailure(data as! String)

    case ApiCall.ApiState.NoConnection:
        showFailure(data as! String)

    default:
        showFailure("Onbekende fout opgetreden")

    }
}

首先调用api：

func getMesDetailData() {
    let apiCall = ApiCall()
    apiCall.createCall(ApiCall.ApiCall.Meting, id: _researchModel.Id)
    apiCall.dataAvailable = apiReceivedDetailData
}

func createCall(apiCall : ApiCall, id : Int){
    createCall(apiCall, id : id, postString : nil)
}

func createCall(apiCall : ApiCall, id : Int?, postString : String?){


    var url : NSURL

    if id == nil{
        url = NSURL(string: _apiUrl + connectToApi(apiCall))!
    }
    else{
        url = NSURL(string: _apiUrl + connectToApi(apiCall) + String(id!))!
    }

    let request = NSMutableURLRequest(URL: url)

    if postString != nil {

        let postData : NSData = (postString! as NSString).dataUsingEncoding(NSUTF8StringEncoding)!
        // create the request
        request.HTTPMethod = "POST"
        request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "content-type")
        request.HTTPBody = postData
    }

    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!
}

private func connectToApi(apiCall : ApiCall) -> String{
    switch apiCall {
    case .Meting:
        return "/meting/"
    case .LastMeting:
        return "/meting/last"
    case .Login:
        return "/login/"
    case .Training:
        return "/training/"
    case .Sport:
        return "/sport/"
    case .Type:
        return "/type/"
    case .Goal:
        return "/goal/"
    default:
        return ""

    }
}

func connectionDidFinishLoading(connection: NSURLConnection!) {

    switch (_responseCode){
    case 200, 201, 400:
        // Succesfull
        var jsonResult: AnyObject? = try? NSJSONSerialization.JSONObjectWithData(_data, options: NSJSONReadingOptions.MutableContainers)

        if jsonResult == nil {
            jsonResult = ""
        }

        dataAvailable!(
            state: _responseCode != 400 ? ApiState.Successful : ApiState.BadRequest,
            data: jsonResult!
        )
    case 403:
        // Faulty credentials
        dataAvailable!(state: ApiState.InvalidCredentials, data: _faultCredentialsMessage)
    case 429:
        // Too many requests
        dataAvailable!(state: ApiState.TooManyRequests, data: _tooManyRequestsMessage)
    default:
        // Unknow status code
        let responseMessage = _unknowStatusCode + " Status code: " + String(_responseCode)
        dataAvailable!(state: ApiState.UnknowStatusCode, data: responseMessage)
    }

}

同一范围内的Swift代码执行的次数不同

0 个答案: