【WIP】iOS 网络通讯

创建: 2018/06/05

网络通讯的基础

 App Transport Security

iOS9以后增加的功能

只允许满足Apple标准的https通信

● 对ATS进行改动的话发布的审查时有可能被询问理由

● 设定项目

Allow Arbitrary Loads	允许所有HTTP通信
NSExceptionDomains	对单独域名进行设定
NSAllowsArbitraryLoadsInWebContent	仅允许WKWebView, UIWebView进行不安全通信

 URLSession

● 方法

dataTask	从URL获取data
downloadTask	将从URL获得的内容暂时放入文件保存
uploadTask	上传数据
resume	开始通信(暂停的话则是继续通信)

class BasicViewController: UIViewController {

    @IBOutlet weak var sampleTextView: UITextView!

    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()
        startSampleRequest()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

//------------------------------------------------------------------------------------
//                                     action setting
//------------------------------------------------------------------------------------
extension BasicViewController {
    func startSampleRequest() {
        guard let url = URL.init(string: "http://localhost:3001") else { return }
//        guard let url = URL.init(string: "https://www.baidu.com/") else { return }
        let session = URLSession.shared
        let task = session.dataTask(with: url) { (data, response, error) in
            if error != nil {
                print("error: \(String(describing: error))")
                return
            }
            guard let data = data else { return }
            DispatchQueue.main.async {
                sleep() // 为了测试效果, 暂停2秒
                let text = String.init(data: data, encoding: String.Encoding.utf8)
                self.toggleActivityIndicator(target: self.activityIndicator)
                self.sampleTextView.text = text
            }
        }
        task.resume()
    }
}

//------------------------------------------------------------------------------------
//                                     style setting
//------------------------------------------------------------------------------------
extension BasicViewController {
    private func toggleActivityIndicator(target: UIActivityIndicatorView) {
        if target.isAnimating {
            target.stopAnimating()
        } else {
            target.startAnimating()
        }
    }
}

通过通讯获取信息

向API发送信息