Question

我在我的应用中使用Alamofire进行API调用。

现在我想在后台线程中调用一些API，以便在调用该API时，其他功能正常工作。那我怎么能在Alamofire做到这一点？

这就是我打电话给APi的方式

func GetDesignationList(pharmacyId : String,completion:(ManageDesignation : ManageDesignationListModel)-> Void)  {
let url = "\(VendorURL)all_employee_designation_list"
let param : [String : AnyObject] = [

    "pharmacyId" : pharmacyId
]

Alamofire.request(.GET, url, parameters: param, encoding: .URL).responseObject { (response:Response<ManageDesignationListModel, NSError>) in
    switch response.result
    {
    case.Success(let value) :
        var ManageDesignationObject : ManageDesignationListModel?
        ManageDesignationObject = value
        completion(ManageDesignation: ManageDesignationObject!)
    case.Failure(let error) : break

    }
}

}

Answer 1

你已经做对了。 Alamofire在后台线程中调用Web服务。如果要测试它是否异步工作，可以在调用后添加print("1")，在print("2")闭包内添加response。

Answer 2

正如所指出的，Alamofire已经为你完成了这项工作。

但回答问题＆＃34; 如何在后台线程中调用API ＆＃34;

可以分派到不同主题的类：

class Dispatcher
{
    enum DispatchLevel
    {
        case Main, UserInteractive, UserInitiated, Utility, Background
        var dispatchQueue: OS_dispatch_queue {
            switch self {
            case .Main:             return dispatch_get_main_queue()
            case .UserInteractive:  return dispatch_get_global_queue(QOS_CLASS_USER_INTERACTIVE, 0)
            case .UserInitiated:    return dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0)
            case .Utility:          return dispatch_get_global_queue(QOS_CLASS_UTILITY, 0)
            case .Background:       return dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0) }
        }
    }

    func delay(bySeconds seconds: Double, dispatchLevel: DispatchLevel = .Main, closure: () -> Void)
    {
        let time = dispatch_time(DISPATCH_TIME_NOW, Int64(seconds * Double(NSEC_PER_SEC)))
        dispatch_after(time, dispatchLevel.dispatchQueue, closure)
    }   
}

使用它：

let myDispatch = Dispatcher()

myDispatch.delay(bySeconds: 10, dispatchLevel: .Background)
{
    print("Do something here on background thread")
}

Answer 3

同时调用Web服务和UI

dispatch_queue_t downloadQueue = dispatch_queue_create("webservice", NULL);
dispatch_async(downloadQueue, ^{


        // do our long running process here
        [NSThread sleepForTimeInterval:10];


        // do any UI stuff on the main UI thread
        dispatch_async(dispatch_get_main_queue(), ^{

        });


    });

如何在后台线程中调用API？

3 个答案: