Swift 3中的HTTP请求 [英] HTTP Requests in Swift 3

问题描述

我对Swift还是相当陌生，并且正在尝试发出HTTP请求.我在这个堆栈溢出问题中尝试了许多想法 ，但是在操场上跑步时，所有这些都会导致错误；我相信这是因为它们都在Swift 1.0-2.0中.

I am fairly new to Swift, and am trying to make an HTTP request. I tried many of the ideas in this Stack Overflow question, but all caused errors when run in a playground; I believe this is because they are all in Swift 1.0-2.0.

如何在Swift 3 中发出HTTP请求?

How can I make an HTTP request in Swift 3?

更新，我尝试了此答案中介绍的第一个解决方案，并在完成Xcode的建议后修复"我遇到了四个错误:

Update I tried the first solution presented in this answer and, after completing Xcode's suggested "Fix-its" I encountered four errors:

推荐答案

您的代码有几个问题:

1. 默认情况下，您的应用无法连接到不安全的(即HTTP)网站.这是一项称为应用程序传输安全性"的功能.您需要在应用程序的Info.plist文件中设置例外情况才能连接到HTTP网站.
2. 此:dataTask(urlwith: ! as URL).您要用惊叹号(!)打开什么?什么是变量名?

1. By default, your app cannot connect to insecure (i.e. HTTP) site. It's a feature called App Transport Security. You need to make an exception in your app's Info.plist file to connect to HTTP sites.
2. This: dataTask(urlwith: ! as URL). What are you trying to unwrap with the exclamation mark (!)? What's the variable name?

在Swift 2和Swift 3之间，许多类名称已更改，因此您发现的答案可能不适用.以下是连接到 httpbin.org 以获得您的IP地址的示例:

A lot of class names have changed between Swift 2 and 3 so those answers you've found may not be applicable. Below is an example that connects to httpbin.org to get your IP address:

import PlaygroundSupport
import Foundation

let url = URL(string: "https://httpbin.org/ip")

let task = URLSession.shared.dataTask(with: url!) { data, response, error in
    guard error == nil else {
        print(error!)
        return
    }
    guard let data = data else {
        print("Data is empty")
        return
    }

    let json = try! JSONSerialization.jsonObject(with: data, options: [])
    print(json)
}

task.resume()
PlaygroundPage.current.needsIndefiniteExecution = true

这篇关于Swift 3中的HTTP请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！