字典不能转换为Void [英] Dictionary is not convertible to Void

问题描述

大家好，我一直在网上搜索没有太多运气，但我正试图绕过Alamofires异步性质。我试图将JSON响应作为字典返回，但Xcode给了我字典不能转换为'Void'

Hi guys I've been searching the net without much luck but I'm trying to get around Alamofires asynchronous nature. I'm trying to return the JSON response as a dictionary but Xcode is giving me "Dictionary is not convertible to 'Void'"

func homePageDetails(userName:String) -> (Dictionary<String,AnyObject>){
    let username = userName
    let hompePageDetails = Alamofire.request(.GET, "http://example.com/API/Bunch/GetHomePageDetails/\(username)/").responseJSON{(request, response, JSON, error) in
    print(JSON)
    var test = JSON as Dictionary<String,AnyObject>
    return test
    }
}

任何帮助都会很大赞赏。

Any help would be greatly appreciated.

推荐答案

您将返回 test：Dictionary< String，AnyObject> 来自闭包，而不是来自 homePageDetails 方法。闭包返回类型是 Void ，这就是你得到这个错误的原因。

You are returning test: Dictionary<String,AnyObject> from closure and not from homePageDetails method. Closure return type is Void, thats why you get this error.

我自己没有使用过Alamofire，但是 Alamofire.request 似乎是非阻塞呼叫。如果是这样你就无法从这个功能返回。你可以使用像完成闭包这样的东西。未经测试的概念：

I haven't used Alamofire myself, but Alamofire.request seems like non-blocking call. If its so you cannot return from this function. You can use something like completion closure. Non tested concept:

func homePageDetails(userName:String, completion:(Dictionary<String,AnyObject>) -> Void) {
    let username = userName
    let hompePageDetails = Alamofire.request(.GET, "http://example.com/API/Bunch/GetHomePageDetails/\(username)/").responseJSON{(request, response, JSON, error) in
        print(JSON)
        var test = JSON as Dictionary<String,AnyObject>
        completion(test)
    }
}

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