ios - 如果符合协议(protocol)，swift 方法接受参数

Question

我有一个名为 WebServiceProtocol 的协议(protocol)和这样的方法:

class func executeRequest(delegate:__SOMETHING__,url:String,postParameters:[String:String],headerParameters:[String:String]){
   //Do something and call delegate
}

我想要一个条件参数来检查输入是否符合 WebServiceProtocol 接受它。

我打算编写一个适用于每个输入的全局类函数，可能是 ViewController 或 NSObject 类。

在 java 类中我们是这样做的:

<? extends SomeClass>

编辑 Web服务.swift

import Foundation

protocol WebServiceProtocol {
    func onDataReceived(data:NSDictionary!)
    func onFailure()
}

class WebService:NSObject{

    class func executeRequest(delegate:WebServiceProtocol,url:String,postParameters:[String:String],headerParameters:[String:String]){
        if let URL: NSURL = NSURL(string: url){
            var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
            request.HTTPMethod = "POST"
            request.HTTPBody = arrayToHttpParams(postParameters).dataUsingEncoding(NSUTF8StringEncoding)
            NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()){
                    response, data, error in
                    if error == nil {
                        if let jsonString = NSString(data: data, encoding: NSUTF8StringEncoding){
                            if let dictionary = Helper.parseJson(jsonString as String) {
                                delegate.onDataReceived(dictionary)
                                println(dictionary)
                                return;
                            }
                        }
                        println("failure !")
                        delegate.onDataReceived(nil)
                    }
                    else{
                        delegate.onFailure()
                    }
            }
        }
    }

    class func arrayToHttpParams(params:[String:String])->String{
        var mergedParams = [String]();
        for (key,value) in params {
            mergedParams.append(key+"="+value)
        }
        return "&".join(mergedParams);
    }
}

身份验证.swift

protocol AuthenticationLoginProtocol {
    func onSuccess(data:NSDictionary)
    func onFailure(data:NSDictionary)
}

class Authentication:NSObject,WebServiceProtocol{

   func attempLogin(delegate:ViewController,emial:String,password:String){

        var params = [String:String]();
        params["key1"]="value1"
        params["key2"]="value2"

        WebService.executeRequest(self, url: "", postParameters: params, headerParameters: params)

    }

    func onDataReceived(data: NSDictionary!) {

    }
    func onFailure() {

    }

}

Answer 1

更新

您正试图在 type 方法中引用一个实例。而不是这个，

WebService.executeRequest(self, url: "", postParameters: params, headerParameters: params)

这样写:

WebService.executeRequest(Authentication.self, url: "", postParameters: params, headerParameters: params)

然后在例如 Authentication 中:

class Authentication: NSObject, WebServiceProtocol {

    // ...

    func someMethod() {
        WebService.executeRequest(self, url: "", postParameters: ["1": "2"], headerParameters: ["1": "2"])
    }

    // ...
}

原始答案

您可以为您的协议(protocol)创建一个带有类型约束的通用函数:

func myFunc<T: WebServiceProtocol>(input: T) {
  // input surely conforms to WebServiceProtocol
}

这样，T 可以是任何类型，只要它符合 WebServiceProtocol。

有关更多详细信息，请参阅类型约束 here .