检查数字的语言是英语还是阿拉伯语/波斯语

Question

在我的项目中，我计划将任何类型的语言更改为波斯语，这是我所做的：

public extension String {
func perstianString (string: String)->String {
let digitSet = CharacterSet.decimalDigits
var finalString = String()
for ch in string.unicodeScalars {
if digitSet.contains(ch) {
let sh = convertoPersianNum(num: "(ch)")
finalString += sh
}
} else {
finalString += "(ch)"
}
}
return finalString
}
func convertoPersianNum(num: String)->String{
var retVlue = String()
var num1 = num
let number = NSNumber(value: Int(num1)!)
let numb = (num as NSString).intValue
let format = NumberFormatter()
format.locale = Locale(identifier: "fa_IR")
let faNumber = format.string(from: number)
return faNumber!
}
}

但是，当源值包含波斯数字时，应用会崩溃。简单地说，我想检查一下它是否是波斯数字，什么都不做，否则做上面的转换：

let string = "ییسس ۱۲۳۴"

使用这种类型，不要做任何其他事情。

Answer 1

public extension String {
private var isPersian: Bool {
let predicate = NSPredicate(format: "SELF MATCHES %@", "(?s).*\p{Arabic}.*")
return predicate.evaluate(with: self)
}
private var toPersianNum: String {
let number = NSDecimalNumber(string: self)
let formatter = NumberFormatter()
formatter.locale = Locale(identifier: "fa_IR")
return formatter.string(from: number) ?? ""
}
var persian:String {
var retVal = String()
self.enumerateSubstrings(in: startIndex..<endIndex, options: .byComposedCharacterSequences) { (string, _, _, _) in
guard let string = string else {return}
if string.isPersian {
retVal += string
}else {
retVal += string.toPersianNum
}
}
return retVal
}
}

let string = "9001ییسس2345777 ۱۲۳۴2345"
string.persian // "۹۰۰۱ییسس۲۳۴۵۷۷۷ناعدد۱۲۳۴۲۳۴۵" (result)