swar 3问题与CVarArg被多次传递

发布时间：2020-12-14 04:46:53 所属栏目：百科来源：网络整理

导读：我在 swift 3中有以下代码： class StringUtility { static func Localizer(tableName: String?) - (_ key: String,_ params: CVarArg...) - String { return { (key: String,params: CVarArg...) in let content = NSLocalizedString(key,tableName: tableN

我在 swift 3中有以下代码：

class StringUtility {

  static func Localizer(tableName: String?) -> (_ key: String,_ params: CVarArg...) -> String {
    return { (key: String,params: CVarArg...) in

      let content = NSLocalizedString(key,tableName: tableName,comment: "")

      if params.isEmpty {
        return content
      }

      print(params) ->>>>>> this prints [[[Wells Fargo]]]
      return NSString.init((format: content,arguments: getVaList(params))) as String
    }
  }
}

func localizationHelper(tableName: String,key: String,params: CVarArg...) -> String {
  let t = StringResourceUtility.Localizer(tableName: tableName)
  print(params) - >>>>>>>>>> this prints [[Wells Fargo]]
  return t(key,params)
}

如果在上面两个函数中看到print语句,每次在函数内部传递CVarArg时都会附加[],导致输出错误的本地化字符串.

1)CVarArg不能像上面的代码一样多次传递？
2)如何解决这个问题？

解决方法

你不能将变量参数列表传递给另一个函数
必须传递一个CVaListPointer.还有withVaList应该
用来代替getVaList：

class StringResourceUtility {

    static func Localizer(tableName: String?) -> (_ key: String,_ params: CVaListPointer) -> String {
        return { (key: String,params: CVaListPointer) in
            let content = NSLocalizedString(key,comment: "")
            return NSString(format: content,arguments: params) as String
        }
    }
}

func localizationHelper(tableName: String,params: CVarArg...) -> String {
    let t = StringResourceUtility.Localizer(tableName: tableName)
    return withVaList(params) { t(key,$0) } 
}

例：

let s = localizationHelper(tableName: "table",key: "%@ %@",params: "Wells","Fargo")
print(s) // Wells Fargo

（编辑：李大同）

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