Question

//在文件中：Struct.swift是我定义结构布局的地方。

struct coin 
{
    var coinYear        = String("")
    var userID          = String("")
    var coinSellCoinID  = String("")
    var coinImageURL    = String("")
    var mintYear        = String("")
    var about           = String("")
    var allowBarter     = String("")
}

/ *

在文件FirstViewController.swift中，我从输入框中获取硬币ID值，然后单击按钮并构建URL字符串。
然后我将该URL发送到fetchCoinJSON函数以获取JSON文本

* /

@IBAction func btnSubmitCoinID(sender: AnyObject)
{
    let temp = coinID.text
    let theCoinURL = NSURL(string: MyVariables.url + "getCoinInfo.php?coinID=" + temp)
    fetchCoinJSON(theCoinURL!)
}

// file：fetchJson.swift使用获取JSON字符串的URL，然后获取JSON字符串并将该字符串传递给parseCoinJson函数。

       func fetchCoinJSON(theurl: NSURL)
        {
            var error: NSError?

var notWorking = coin()

MyVariables.rawCoinJSON =

NSString(contentsOfURL: theurl, encoding: NSUTF8StringEncoding, error: &error)!

var data: NSData =
MyVariables.rawCoinJSON.dataUsingEncoding(NSUTF8StringEncoding)!

    let anyObj: AnyObject? = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error)
            println("Error: \(error)")

    notWorking = parseCoinJson(anyObj!) <--- var notWorking = nil
            NSLog("OoOoOoOoOoOoOoO")
            println(notWorking.coinWeight) <--- logs null
        }

//文件ParseJSON.swift这里我解析JSON并设置相应的struct值。使用NSLog我知道c.CoinYear确实包含正确的值以及所有其他值。然而

返回c

给出错误：ParseJSON.swift：95：16：'coin'不能转换为'（）'

    func parseCoinJson(anyObj:AnyObject)
    {
        if  anyObj is Array<AnyObject>
        {
            var c = coin()
            for json in anyObj as! Array<AnyObject>
            {
                c.userID = (json["userid"] as AnyObject? as? String) ?? String("") ?? String ("")
                c.mintYear = (json["mintyear"] as AnyObject? as? String) ?? String("") ?? String ("")
                c.coinActiveStatus = (json["isActive"] as AnyObject? as? String) ?? String("") ?? String ("")
                c.coinSellCoinID = (json["sellcoinid"] as AnyObject? as? String) ?? String("") ?? String ("")
                c.coinImageURL = (json["coinImageURL"] as AnyObject? as? String) ?? String("") ?? String ("")
                c.about = (json["about"] as  AnyObject? as? String) ?? String("") ?? String ("")
                c.allowBarter = (json["allowBarter"] as  AnyObject? as? String) ?? String("") ?? String ("")

....

    }
            return c
        }
    }

Answer 1

func parseCoinJson(anyObj:AnyObject)

此函数返回Void，即()。然后返回coin。你的意思是：

func parseCoinJson(anyObj:AnyObject) -> Coin

请注意，类型应始终为前导上限。所以这应该是struct Coin。

Swift返回为函数创建struct的实例

1 个答案: