ios - NSMutableURLRequest 和参数标签错误

Question

我收到一条错误消息，提示“参数标签'(URL:, cachePolicy:, timeoutInterval:)' 不匹配任何可用的重载”，我不知道如何解决这个问题，有人知道吗？我正在使用 Swift 3.0 和 XCode 8.3.2 Here is my code

import Foundation
import UIKit
extension UIViewController {

    func makeImageViewWithColor(_ color: UIColor) -> UIImage {
        let rect: CGRect = CGRect (x: 0, y: 0, width: 1, height: 1)
        color.setFill()
        UIRectFill(rect)
        let image:UIImage =UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return image
    }
    //Function Alert View
    func alertView(title:String, message:String, alertStyle:UIAlertControllerStyle, alertAction:UIAlertAction) {
        let alert:UIAlertController = UIAlertController(title: title, message: message, preferredStyle: alertStyle)
        alert.addAction(alertAction)
        self.present(alert, animated: true, completion: nil)
    }


    //Function query to server

    func queryToServer(urlSource:String, postString:String, result:@escaping (_ dataResult:NSData?, _ errorResult:NSError) -> ()) {
        let url:NSURL = NSURL(string: urlSource)!
        let request = NSMutableURLRequest (URL: url, cachePolicy: NSURLRequest.CachePolicy.reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 10)
        request.HTTPMethod = "POST"
        request.HTTPBody = glGetString.dataUsingEncoding(NSUTF8StringEncoding)
        let session = URLSession.shared
        session.dataTaskWithRequest(request) { (data, response, error) -> Void in
            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                if error == nil {
                    result(dataResult: data, errorResult: nil)
                } else {
                    result(dataResult: nil, errorResult: error)
                }
            })
        }
    }

}

Answer 1

根本不要在 Swift 3 中使用 NSMutableURLRequest。

改用 Swift 3 原生语法，有新的结构 URL 和 URLRequest。

var 关键字使请求可变。

let url = URL(string: urlSource)!
var request = URLRequest(url: url, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 10)

PS:您的代码中的问题是大写的 URL 参数标签。

---

编辑:方法 queryToServer 的 Swift 3 等价物是:

func queryToServer(urlSource:String, postString:String, result:@escaping (Data?, Error?) -> ()) {
    let url = URL(string: urlSource)!
    var request = URLRequest (url: url, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 10)
    request.httpMethod = "POST"
    request.httpBody = postString.data(using: .utf8)
    let session = URLSession.shared
    session.dataTask(with: request) { (data, response, error) in
        DispatchQueue.main.async {
            result(data, error)
        }
    }.resume()
}

调度 block 中的错误检查没有用。要么数据有效，要么错误为 nil，反之亦然。另一方面，您必须resume 数据任务才能启动它，glGetString 可能是 postString。