ios Swift 3 URLSession.shared() 对成员'dataTask(with:completionHandler:) 错误的不明确引用（错误）
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Swift 3 URLSession.shared() Ambiguous reference to member 'dataTask(with:completionHandler:) error (bug)
提问by SwiftDeveloper
Hello I have working json parsing code for swift2.2 but when i use it for Swift 3.0 gives me that error
你好，我有用于 swift2.2 的 json 解析代码，但是当我将它用于 Swift 3.0 时给了我那个错误
ViewController.swift:132:31: Ambiguous reference to member 'dataTask(with:completionHandler:)'
ViewController.swift:132:31：对成员“dataTask(with:completionHandler:)”的不明确引用
My codes here
我的代码在这里
let listUrlString = "http://bla.com?batchSize=" + String(batchSize) + "&fromIndex=" + String(fromIndex)
let myUrl = URL(string: listUrlString);
let request = NSMutableURLRequest(url:myUrl!);
request.httpMethod = "GET";
let task = URLSession.shared().dataTask(with: request) {
data, response, error in
if error != nil {
print(error!.localizedDescription)
DispatchQueue.main.sync(execute: {
AWLoader.hide()
})
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSArray
if let parseJSON = json {
var items = self.categoryList
items.append(contentsOf: parseJSON as! [String])
if self.fromIndex < items.count {
self.categoryList = items
self.fromIndex = items.count
DispatchQueue.main.async(execute: {
self.categoriesTableView.reloadData()
AWLoader.hide()
})
}else if( self.fromIndex == items.count){
DispatchQueue.main.async(execute: {
AWLoader.hide()
})
}
}
} catch {
AWLoader.hide()
print(error)
}
}
task.resume()
Thanks for ideas.
谢谢你的想法。
回答by Eric Aya
The compiler is confused by the function signature. You can fix it like this:
编译器被函数签名弄糊涂了。你可以像这样修复它：
let task = URLSession.shared.dataTask(with: request as URLRequest) {
But, note that we don't have to cast "request" as URLRequestin this signature ifit was declared earlier as URLRequestinstead of NSMutableURLRequest:
但是，请注意，如果之前声明为而不是，我们不必像URLRequest在此签名中那样强制转换“请求” ：URLRequestNSMutableURLRequest
var request = URLRequest(url:myUrl!)
This is the automatic casting between NSMutableURLRequestand the new URLRequestthat is failing and which forced us to do this casting here.
这是失败的和NSMutableURLRequest新的之间的自动转换URLRequest，这迫使我们在这里进行转换。
回答by HenryRootTwo
You have init'd myRequestas NSMutableURLRequest, you need this:
你已经初始化myRequest为NSMutableURLRequest，你需要这个：
var URLRequest
Swift is ditching both the NSMutable...thing. Just use varfor the new classes.
斯威夫特正在放弃这两NSMutable...件事。仅var用于新课程。
回答by Saumil Shah
Xcode 8 and Swift 3.0
Xcode 8 和 Swift 3.0
Using URLSession:
使用 URLSession：
let url = URL(string:"Download URL")!
let req = NSMutableURLRequest(url:url)
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config, delegate: self, delegateQueue: OperationQueue.main)
let task : URLSessionDownloadTask = session.downloadTask(with: req as URLRequest)
task.resume()
URLSession Delegate call:
URLSession 委托调用：
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask,
didWriteData bytesWritten: Int64, totalBytesWritten writ: Int64, totalBytesExpectedToWrite exp: Int64) {
print("downloaded \(100*writ/exp)" as AnyObject)
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL){
}
Using Block GET/POST/PUT/DELETE:
使用块 GET/POST/PUT/DELETE：
let request = NSMutableURLRequest(url: URL(string: "Your API URL here" ,param: param))!,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval:"Your request timeout time in Seconds")
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers as? [String : String]
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest) {data,response,error in
let httpResponse = response as? HTTPURLResponse
if (error != nil) {
print(error)
} else {
print(httpResponse)
}
DispatchQueue.main.async {
//Update your UI here
}
}
dataTask.resume()
Working fine for me.. try it 100% result guarantee
对我来说工作正常.. 尝试 100% 结果保证
回答by liwp_Stephen
This problem is caused by URLSession has two dataTask methods
这个问题是由 URLSession 有两个 dataTask 方法引起的
open func dataTask(with request: URLRequest, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDataTask
open func dataTask(with url: URL, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Swift.Void) -> URLSessionDataTask
The first one has URLRequestas parameter, and the second one has URLas parameter, so we need to specify which type to call, for example, I want to call the second method
第一个有URLRequest作为参数，第二个有URL作为参数，所以我们需要指定要调用的类型，例如我想调用第二个方法
let task = URLSession.shared.dataTask(with: url! as URL) {
data, response, error in
// Handler
}
回答by Zhanserik
In my case error was in NSURL
在我的情况下，错误是在NSURL 中
let url = NSURL(string: urlString)
In Swift 3 you must write just URL:
在 Swift 3 中，你必须只写URL：
let url = URL(string: urlString)
回答by Naren
For Swift 3 and Xcode 8:
对于 Swift 3 和 Xcode 8：
var dataTask: URLSessionDataTask?
if let url = URL(string: urlString) {
self.dataTask = URLSession.shared.dataTask(with: url, completionHandler: { (data, response, error) in
if let error = error {
print(error.localizedDescription)
} else if let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 {
// You can use data received.
self.process(data: data as Data?)
}
})
}
}
//Note: You can always use debugger to check error
//注意：您可以随时使用调试器来检查错误
回答by Alisha G
In swift 3 the compiler is confused by the function signature. Specifying it will clear the error. Also convert the url string to type URL. The following code worked for me.
在 swift 3 中，编译器被函数签名弄糊涂了。指定它将清除错误。还将 url 字符串转换为类型 URL。以下代码对我有用。
let urlString = "http://bla.com?batchSize="
let pathURL = URL(string: urlString)!
var urlRequest = URLRequest(url:pathURL)
let session = URLSession.shared
let dataTask = session.dataTask(with: urlRequest as URLRequest) { (data,response,error) in
回答by Josh
Short and concise answer for Swift 3:
Swift 3 的简短回答：
guard let requestUrl = URL(string: yourURL) else { return }
let request = URLRequest(url:requestUrl)
URLSession.shared.dataTask(with: request) {
(data, response, error) in
...
}.resume()
回答by SwiftDeveloper
Tested xcode 8 stable version ;Need to use var requestvariable with URLRequest()With thats you can easily fix that (bug)
已测试 xcode 8 稳定版；需要使用var request变量与那URLRequest()你可以很容易地修复（错误）
var request = URLRequest(url:myUrl!)And
var request = URLRequest(url:myUrl!)和
let task = URLSession.shared().dataTask(with: request as URLRequest) { }
Worked fine ! Thank you guys, i think help many people. !
工作得很好！谢谢你们，我想帮助了很多人。！
回答by Nikunj Patel
// prepare json data
let mapDict = [ "1":"First", "2":"Second"]
let json = [ "title":"ABC" , "dict": mapDict ] as [String : Any]
let jsonData : NSData = NSKeyedArchiver.archivedData(withRootObject: json) as NSData
// create post request
let url = NSURL(string: "http://httpbin.org/post")!
let request = NSMutableURLRequest(url: url as URL)
request.httpMethod = "POST"
// insert json data to the request
request.httpBody = jsonData as Data
let task = URLSession.shared.dataTask(with: request as URLRequest){ data,response,error in
if error != nil{
return
}
do {
let result = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:AnyObject]
print("Result",result!)
} catch {
print("Error -> \(error)")
}
}
task.resume()
