Swift 3:URLSession / URLRequest不起作用

时间:2016-10-04 20:06:31

标签: ios swift swift3 nsurlsession nsurlrequest

我仍在尝试将我们的应用程序从Swift 2转换为Swift 3,因为我被迫使用,因为我们所有的Apple设备现在都在运行iOS 10.

我已经完成了代码转换并认为我做得很好,但是在尝试调试我的JSON问题时(在另一个问题中发布),我现在处理的请求甚至没有被发送。

let params: [String:AnyObject] = [
    "email":"\(self.preferences.string(forKey: "preference_email")!)" as AnyObject
]
let requestParams: [String:AnyObject] = [
    "action":"601" as AnyObject,
    "params":params as AnyObject
]

do {
    let requestObject = try JSONSerialization.data(withJSONObject: requestParams, options:[])
    var request = URLRequest(url: URL(string: "http://domain.tld/path/")!)

    request.httpBody = requestObject
    request.httpMethod = "POST"

    let config = URLSessionConfiguration.default
    let session = URLSession(configuration: config)

    NSLog("Got here?")

    session.dataTask(with: request) {data, response, error in
        guard let data = data, error == nil else {
            print("error=\(error)")
            return
        }

        NSLog("Got here 3?")

        let object:JSON = JSON(data:data)

        NSLog("Object: \(object)")
    }.resume()

    NSLog("Got here 4?")
} catch {
    NSLog("Got here catch?")
}

NSLog("End of getUser")

上面的代码产生以下输出:

2016-10-04 13:00:12.011969 OneTouch[1589:623015] [DYMTLInitPlatform] platform initialization successful
2016-10-04 13:00:12.264319 OneTouch[1589:622954] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2016-10-04 13:00:12.265321 OneTouch[1589:622954] [MC] Reading from public effective user settings.
2016-10-04 13:00:12.295055 OneTouch[1589:622954] Got here?
2016-10-04 13:00:12.295445 OneTouch[1589:622954] Got here 4?
2016-10-04 13:00:12.295515 OneTouch[1589:622954] End of getUser
(lldb) 

这意味着甚至没有提出请求。是否有一些关键我必须再次添加到PLIST?这开始变得烦人。

下面是我的旧代码,它甚至不再起作用了:

let params: [String:AnyObject] = [
    "email":"\(self.preferences.string(forKey: "preference_email")!)" as AnyObject
]
let requestParams: [String:AnyObject] = [
    "action":"601" as AnyObject,
    "params":params as AnyObject
]

do {
    let requestObject = try JSONSerialization.data(withJSONObject: requestParams, options:[])
    let request = NSMutableURLRequest(url: URL(string: "http://domain.tld/path/" as String)!, cachePolicy:NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData, timeoutInterval: 20)

    request.httpBody = requestObject
    request.httpMethod = "POST"

    NSLog("Got here?")

    let task = URLSession.shared.dataTask(with: request as URLRequest, completionHandler: {data, response, error in
        if error != nil {
            NSLog("Got here 2?")
        }

        NSLog("Got here 3?")

        let object:JSON = JSON(data:data!)

        NSLog("Object: \(object)")
    })

    NSLog("Got here 4?")

    task.resume()
} catch {
    NSLog("Got here catch?")
}

NSLog("End of getUser")

上面的代码产生与其他代码相同的输出!

1 个答案:

答案 0 :(得分:0)

如果在调用getUser后立即放置断点,则URLSession任务的完成处理程序(异步运行(即通常稍后完成),除非请求立即失败或者某些缓存响应满足)没有机会被召唤。

如果在dataTask完成处理程序中放置断点,那么您应该在那时看到您的数据。

就个人而言,我确保给getUser一个完成处理程序,以便您知道它何时完成:

func getUser(completionHandler: @escaping (JSON?, Error?) -> Void) {
    let params = [
        "email":"\(preferences.string(forKey: "preference_email")!)"
    ]

    let requestParams: [String: Any] = [
        "action": "601",
        "params": params
    ]

    do {
        let requestObject = try JSONSerialization.data(withJSONObject: requestParams)

        var request = URLRequest(url: URL(string: "http://domain.tld/path/")!, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 20)

        request.httpBody = requestObject
        request.httpMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("application/json", forHTTPHeaderField: "Accept")

        let task = URLSession.shared.dataTask(with: request) {data, response, error in
            guard let data = data, error == nil else {
                completionHandler(nil, error)
                return
            }

            completionHandler(JSON(data: data), nil)
        }

        task.resume()
    } catch {
        completionHandler(nil, error)
    }
}

然后当你打电话时,你可以这样做:

getUser { json, error in
    guard let json = json else {
        print(error)
        return
    }

    // do something with json
    print(json)
}

然后将断点放在getUser的完成处理程序中。请记住,您无法保证完成处理程序将在主队列上运行,因此您需要确保将更新和UI或模型更新返回到主队列。