'subscript(_:)' 的使用不明确

Question

func getCurrency()
    {

        let myLink:[String] = ["url1", "url2", "url3"]
        for link in myLink{
            let url = URL(string: link)
            let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
                if error != nil{
                    print("ERROR")
                }
                else{
                    if let content = data{
                        do{
                            if link == myLink[0]{
                                let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject

                                if let ratesusd = myJson["INR_USD"] as? Double{
                                    self.usdValue = ratesusd
                                }
                            }
                            else if link == myLink[1]{
                                let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject

                                if let rateseuro = myJson["INR_EUR"] as? Double{
                                    self.euroValue = rateseuro
                                }
                            }
                            else if link == myLink[2]{
                                let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject

                                if let ratespound = myJson["INR_GBP"] as? Double{
                                    self.poundValue = ratespound
                                }
                            }


                        }
                        catch{

                        }
                    }
                }
                }
                task.resume()



        }
    }

经常显示此错误。我已将 if let content = data{ 更改为 if let content = data["content"] as? Double{ 但它显示另一个错误，即 "Value of optional type 'Data?' must be unwrapped to refer to member 'subscript' of wrapped base type 'Data'"。我在包括 Whosebug 在内的许多网站上看到了一些相关查询，但它们是 MacOS，但我在 WatchOS 上工作。任何人都请帮助！

Answer 1

一个 JSON 对象从未未指定 AnyObject。如果您希望字典将其转换为字典

let myJson = try JSONSerialization.jsonObject(with: content) as! [String:Any]

这修复了错误，因为编译器现在知道真实类型。

并且从不指定 .mutableContainers。该选项在 Swift

中无效

'subscript(_:)' 的使用不明确

Ambiguous use of 'subscript(_:)'

xcode

ios

swift

apple-watch

watchos