Swift NSNumberFormatter

Question

我正在快速阅读我的书，边走边建。我在使用这个NSNumberFormatter类时遇到了问题。在我的语句之后，我一直收到错误：“期望的声明”。

formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle

我已经重写了我的代码多次，我把每一个字母都与我的书进行了比较，我不知道我哪里错了

当我尝试使用以下命令运行函数时：

account1.deposit(depositAmount)

我再次收到错误消息"Expected“

下面是我的代码：

    //: Playground - noun: a place where people can play

    import Cocoa
    import Foundation

    public class Account
    {
    public var name: String = ""
    public var balance: Double = 0.0


    public init(name: String, balance: Double)
    {
        self.name = name
        if balance > 0.0
        {
            self.balance = balance
        }
    }

    public func deposit(amount: Double)
    {
        if amount > 0.0
        {
            balance = balance + amount
        }
    }

    public func withdraw(amount: Double)
    {
        if balance - amount >= 0.0
        {
            balance = balance - amount
        }
    }



   let formatter = NSNumberFormatter()
  formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle


    func formatAccountString(account: Account) -> String {
        return account.name + "'s balance: " + formatter.stringFromNumber(account.balance)!
    }




    let account1 = Account(name: "Jane Green", balance: 50.00)
    let account2 = Account(name: "John Blue", balance: -7.53)

   //println(formatAccountString(account1))

    var depositAmount = 25.53
    account1.deposit(depositAmount)
    account2.deposit(depositAmount)

    println("depositing " + formatter.StringFromNumber(depositAmount) + " into account1\n")
    println("depositing " + formatter.StringFromNumber(depositAmount) + " into account1\n")
    }

提前谢谢你！

Answer 1

问题很可能出在formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle的位置上。您不能从类级别运行代码。将其移动到init。