ios - 无法使用 String 类型的索引下标 NSDictionary 类型的值。从 Swift 2.3 -> 3.2 转换时

Question

我需要帮助。从 Swift 2.3 -> 3.2 转换时，我收到以下错误。我无法解决此错误。

下面是我的编码工作，我遇到了一些问题。

错误:

Cannot subscript a value of type NSDictionary with an index of type String

在这一行:if let tempValue:AnyObject = tempDict["value"] {

if (productToReturn.planoRetailPackSize == nil || productToReturn.planoRetailPackSize == "0.0") {
            if let dataToProcess:NSDictionary = dict["data"] as? NSDictionary {
                    if let productDataRecord:NSDictionary = dataToProcess["productDataRecord"] as? NSDictionary{
                        if let module:NSArray = productDataRecord["module"] as? NSArray{
                            for (_,value) in module.enumerated(){
                                if let parentDic:NSDictionary = value as? NSDictionary{
                                    if let cpmChild:NSDictionary = parentDic["cem:canadaExtensionModule"] as? NSDictionary {
                                        if let tempDict:NSDictionary = cpmChild["retailPackSize"] as? NSDictionary {
                                                if let tempValue:AnyObject = tempDict["value"]  { //Error is Here
                                                let myValue: String = String(describing: tempValue)
                                                productToReturn.planoRetailPackSize = myValue
                                    }
                                }//item
                            }
                        }

                        }
                    }
                }
            }
        }

请帮帮我。我对 iOS 很陌生。无法理解此类错误。

Answer 1

使用原生类型

if let dataToProcess = dict["data"] as? [String:Any],
    let productDataRecord = dataToProcess["productDataRecord"] as? [String:Any],
    let module = productDataRecord["module"] as? [[String:Any]] {
    for value in module {
        if let cpmChild = value["cem:canadaExtensionModule"] as? [String:Any],
            let tempDict = cpmChild["retailPackSize"] as? [String:Any],
            let myValue = tempDict["value"] as? String {
            productToReturn.planoRetailPackSize = myValue
        }
    }
}

注意:在 for 循环中，myValue 将在每次迭代中覆盖 planoRetailPackSize。这很可能不是故意的。