为什么字符串在我的例子中不相等？

Question

我有 currencyFormatter 与 se_SV 语言环境。

var currencyFormatter: NumberFormatter = {
    let formatter = NumberFormatter()
    formatter.currencySymbol = ""
    formatter.locale = Locale(identifier: "se_SV")
    formatter.minimumFractionDigits = 2
    formatter.maximumFractionDigits = 2
    formatter.numberStyle = .currencyAccounting
    formatter.isLenient = true
    return formatter
}()

我正在将 NSNumber 转换为 String。

let firstString = currencyFormatter.string(from: NSNumber(value: 22222222.50)) // "22 222 222,50 "

然后我手动创建 String 与 firstString 相同。

let secondString = "22 222 222,50 "

为什么当我检查 firstString == secondString 是否收到 false 时？

Answer 1

print(Array(firstString!.unicodeScalars))
// ["2", "2", "\u{00A0}", "2", "2", "2", "\u{00A0}", "2", "2", "2", ",", "5", "0", "\u{00A0}"]

print(firstString!.replacingOccurrences(of: "\u{A0}", with: " ") == secondString)
// true

显示数字格式化程序用 "non-breaking spaces" U+00A0 分隔组。这样可以防止数字被拆分多行文本中的行。

为什么字符串在我的例子中不相等？

Why Strings are not equal in my case?

string

number-formatting

swift