如何在 web-view swift 中设置代理?

创建自定义 url 协议处理程序后，请使用以下代码将其注册，以便您的协议优先于任何内置协议.

Once you created your custom url protocol handler, register it in using below code so your protocol will have priority over any of the built-in protocols.

import UIKit
import CoreFoundation

class ViewController: UIViewController {

    @IBOutlet weak var sWebViewOutlet : UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        setupViewDidLoad()
    }

    func setupViewDidLoad() {
        SpecialProtocol.registerSpecialProtocol()

        let url = NSURL(string: "http://www.google.com")
        let req = NSURLRequest(URL: url!)
        /* if this request will be handled by our special protocol... */
        //if ( [SpecialProtocol canInitWithRequest:request] ) {
        if SpecialProtocol.canInitWithRequest(req) {
            print("SpecialProtocol.canInitWithRequest(req)")
            self.sWebViewOutlet.loadRequest(req)
        }
        else {
            print("SpecialProtocol.cantInitWithRequest(req)")
        }
    }
}

NSURLProtocol 类的一个子类，它将处理所有 Web 协议，例如 HTTP、HTTPS、SSL 等.它提供了执行特定于协议的 URL 数据加载的基本结构.下面的代码，解决了我的问题……如果您发布比我更好的解决方案或答案，我将不胜感激.

A subclass of NSURLProtocol class that will handle all web protocols such as HTTP, HTTPS, SSL etc. It provides the basic structure for performing protocol-specific loading of URL data. Below code, solved my problem... I'll appreciate if you post a better solution or answer than mine.

import UIKit
import CoreFoundation

class SpecialProtocol: NSURLProtocol, NSURLSessionDataDelegate, NSURLSessionTaskDelegate {
//var httpMessageRef: CFHTTPMessage;()
    var httpMessageRef: CFHTTPMessage?

    class func registerSpecialProtocol() {
        var inited: Bool = false
        if !inited {
            NSURLProtocol.registerClass(SpecialProtocol.self)
            inited = true
        }
    }


    private var dataTask:NSURLSessionDataTask?
    private var urlResponse:NSURLResponse?
    private var receivedData:NSMutableData?

    class var CustomKey:String {
        return "myCustomKey"
    }

    // MARK: NSURLProtocol

    override class func canInitWithRequest(request: NSURLRequest) -> Bool {
        if (NSURLProtocol.propertyForKey(SpecialProtocol.CustomKey, inRequest: request) != nil) {
            return false
        }

        return true
    }

    override class func canonicalRequestForRequest(request: NSURLRequest) -> NSURLRequest {
        return request
    }

    override func startLoading() {

        let newRequest = self.request.mutableCopy() as! NSMutableURLRequest

        NSURLProtocol.setProperty("true", forKey: SpecialProtocol.CustomKey, inRequest: newRequest)

        let defaultConfigObj = customizeEphemeralSessionConfiguration()//NSURLSessionConfiguration.defaultSessionConfiguration()
        let defaultSession = NSURLSession(configuration: defaultConfigObj, delegate: self, delegateQueue: nil)

        self.dataTask = defaultSession.dataTaskWithRequest(newRequest)
        self.dataTask!.resume()

    }

    func customizeEphemeralSessionConfiguration() -> NSURLSessionConfiguration {
        let proxy_server: CFString = "YourProxyServer" // proxy server

        let proxy_port: CFNumber = 1234 // your port


        let hostKey: NSString = kCFNetworkProxiesHTTPProxy as NSString
        let portKey: NSString = kCFNetworkProxiesHTTPPort as NSString

        let proxyDict:[String:AnyObject] = [kCFNetworkProxiesHTTPEnable as String: true, hostKey as String:proxy_server, portKey as String: proxy_port]

        let config = NSURLSessionConfiguration.ephemeralSessionConfiguration()
        config.connectionProxyDictionary = proxyDict as [NSObject : AnyObject]

        return config
    }


    override func stopLoading() {
        self.dataTask?.cancel()
        self.dataTask       = nil
        self.receivedData   = nil
        self.urlResponse    = nil
    }

    // MARK: NSURLSessionDataDelegate

    func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask,
                    didReceiveResponse response: NSURLResponse,
                                       completionHandler: (NSURLSessionResponseDisposition) -> Void) {

        self.client?.URLProtocol(self, didReceiveResponse: response, cacheStoragePolicy: .NotAllowed)

        self.urlResponse = response
        self.receivedData = NSMutableData()

        completionHandler(.Allow)
    }

    func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
        self.client?.URLProtocol(self, didLoadData: data)

        self.receivedData?.appendData(data)
    }

    // MARK: NSURLSessionTaskDelegate

    func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {
        if error != nil && error!.code != NSURLErrorCancelled {
            self.client?.URLProtocol(self, didFailWithError: error!)
        } else {
            saveCachedResponse()
            self.client?.URLProtocolDidFinishLoading(self)
        }
    }

    // MARK: Private methods

    /**
     Do whatever with the data here
     */
    func saveCachedResponse () {
        let timeStamp = NSDate()
        let urlString = self.request.URL?.absoluteString
        let dataString = NSString(data: self.receivedData!, encoding: NSUTF8StringEncoding) as NSString?
        print("TimeStamp:\(timeStamp)\nURL: \(urlString)\n\nDATA:\(dataString)\n\n")
    }

}