标签：ror color site events nis The add data span
URL Loading System提供了访问URL资源的系统，提供了访问http/https/自定义URL访问的接口。其中，URLSession实例可以创建多个URLSessionTask实例，完成不同的工作。
我们可以将URLSession类理解为会话层，用于管理网络接口的创建、维护、删除等等工作，我们要做的工作也只是会话层之后的层。
这里上传下载的都是一个字符串；实际形式是json（需要把NSData转成Json）
get
let url1 = "https://coconutnut.xyz:2019/tumble" let sessionConfigure = URLSessionConfiguration.default // sessionConfigure.httpAdditionalHeaders = ["Content-Type": "application/json"] // sessionConfigure.timeoutIntervalForRequest = 30 sessionConfigure.requestCachePolicy = .reloadIgnoringLocalCacheData let session = URLSession(configuration: sessionConfigure) guard let url = URL(string: url1) else { return } let url1Request = URLRequest(url: url) let dataTask1 = session.dataTask(with: url1Request) { (data, response, error) in guard data != nil else {return} let str = String(data: data!, encoding: String.Encoding.utf8) // 这里需要再加一个逻辑判断 guard let strnow = str else{return}
最后返回的strnow就是我们要获得的字符串；
post
let order = Qumot(value: "1") guard let uploadData = try? JSONEncoder().encode(order) else { return } print(uploadData) let url = URL(string: "https://coconutnut.xyz:2019/qumot")! var request = URLRequest(url: url) request.httpMethod = "POST" request.setValue("application/json", forHTTPHeaderField: "Content-Type") let task = URLSession.shared.uploadTask(with: request, from: uploadData) { data, response, error in if let error = error { print ("error: \(error)") return } guard let response = response as? HTTPURLResponse, (200...299).contains(response.statusCode) else { print ("server error") return } if let mimeType = response.mimeType, mimeType == "application/json", let data = data, let dataString = String(data: data, encoding: .utf8) { print ("got data: \(dataString)") } } task.resume()
后台唤醒的地方，可以使用自己写的回调函数
可以在这些地方用到闭包
Tasks in a session also share a common delegate object. You implement this delegate to provide and obtain information when various events occur, including when:
Authentication fails.
Data arrives from the server.
Data becomes available for caching.
If you don’t need the features provided by a delegate, you can use this API without providing one by passing nil when you create a session.
另外这是一个异步的接口，你可以一边处理UI一边访问网络
Like most networking APIs, the URLSession API is highly asynchronous. It returns data to your app in one of two ways, depending on the methods you call:
By calling a completion handler block when a transfer finishes successfully or with an error.
By calling methods on the session’s delegate as data arrives and when the transfer is complete.
https://developer.apple.com/documentation/foundation/url_loading_system
https://developer.apple.com/documentation/foundation/url_loading_system/uploading_data_to_a_website
标签：ror color site events nis The add data span
原文地址：https://www.cnblogs.com/Plorde/p/12303043.html
