ios - 如何以美国风格格式化恰好是电话号码的 UITextfield 文本？

Question

假设我有这个号码 1234567890

我想要这种格式 (xxx) xxx-xxxx

所以在显示屏上我希望它显示为 (123) 456-7890

我将如何实现这一目标？

我需要在文本字段上使用某种正则表达式吗？

谢谢你的时间

Answer 1

如果您使用的是 Swift:

let phoneNum = activity["phoneNumber"] as String
let digits = NSCharacterSet.decimalDigitCharacterSet().invertedSet as NSCharacterSet
let filtered1 = phoneNum.componentsSeparatedByCharactersInSet(digits) as NSArray

let filtered = filtered1.componentsJoinedByString("") as NSString

if filtered.length == 11 {
    let formatted = NSString(format: "(%@) %@-%@", filtered.substringWithRange(NSMakeRange(1, 3)), filtered.substringWithRange(NSMakeRange(4, 3)), filtered.substringWithRange(NSMakeRange(7, 4))) as NSString

    phoneNumberField.text = formatted
} else if filtered.length == 10 {
    let formatted = NSString(format: "(%@) %@-%@", filtered.substringWithRange(NSMakeRange(0, 3)), filtered.substringWithRange(NSMakeRange(3, 3)), filtered.substringWithRange(NSMakeRange(6, 4))) as NSString

    phoneNumberField.text = formatted
}