Saving decimal and currency in Core Data

Is it possible to save numbers with grouping separators and currency into core data and if so can someone point me in the right direction.

是否可以通过将分隔符和货币分组到核心数据来保存数字,如果是这样,有人可以指出我正确的方向。

I have mile.text which is a decimal number with the grouping separator, payPerMile.text which is currency and then the grossPay.text which is also currency.

我有mile.text这是一个带分组分隔符的十进制数字,payPerMile.text是货币,然后是grossPay.text,它也是货币。

Everything calculates and displays fine until I save it. I print the numbers when I save, everything after the grouping separator is gone and the currency lines display as NaN.

一切都计算并显示正常,直到我保存。我保存时打印数字,分组分隔符后的所有内容都消失,货币行显示为NaN。

@IBAction func save(_ sender: UIButton) {

    if let item = item {

        item.startdate = startDate.text
        item.unitnumber = unitNumber.text
        item.miles = NSDecimalNumber(string: miles.text ?? "0.0")
        item.paypermile = NSDecimalNumber(string: payPerMile.text ?? "0.00")
        item.grosspay = NSDecimalNumber(string: grossPay.text ?? "0.00")
        item.company = company.text
        item.destination = destination.text
        item.enddate = endDate.text

    } else if let entitydescription = NSEntityDescription.entity(forEntityName: "DriveAwayMain", in: pc) {

        let item = DriveAwayMain(entity: entitydescription, insertInto: pc)

        item.startdate = startDate.text
        item.unitnumber = unitNumber.text
        item.miles = NSDecimalNumber(string: miles.text ?? "0.0")
        item.paypermile = NSDecimalNumber(string: payPerMile.text ?? "0.00")
        item.grosspay = NSDecimalNumber(string: grossPay.text ?? "0.00")
        item.company = company.text
        item.destination = destination.text
        item.enddate = endDate.text

    }

1 个解决方案

#1

NSDecimalNumber(string:) only accepts plain numbers, not formatted numbers. If the user is entering formatted currency values then you need to use a NumberFormatter in .currency mode to parse the string into a number.

NSDecimalNumber(string :)只接受普通数字,而不是格式化数字。如果用户输入格式化的货币值,则需要在.currency模式下使用NumberFormatter将字符串解析为数字。

Example:

print(NSDecimalNumber(string: "$4,560.45"))

Output:

NaN

Using a NumberFormatter:

使用NumberFormatter:

let curFmt = NumberFormatter()
curFmt.generatesDecimalNumbers = true
curFmt.numberStyle = .currency
if let num = curFmt.number(from: "$4,560.45") {
    print(num)
} else {
    print("Not valid currency number")
}

Output:

4560.45