如何在Swift 4中屏蔽文本字段？ [重复]

Question

这个问题在这里已有答案：

• How to masking the last number in Swift? 1回答

我想在textfield.text中屏蔽电子邮件，但我只在中间得到了值。我想从中间到@ gmail.com获取值，如下例所示。

例如：

1. easy var = [email protected]

输出= ****[email protected]

2. easy var = [email protected]

输出= ****[email protected]

    let email = "[email protected]"

    let components = email.components(separatedBy: "@")

    let result = hideMidChars(components.first!) + "@" + components.last!

    print(result)

输出我得到：**** 5****@gmail.com

我的期望：**** [email protected]

Answer 1

func hide(email: String) -> String {

    let parts = email.split(separator: "@")
    if parts.count < 2 {
        return email
    }
    let name = parts[0]
    let appendix = parts[1]
    let lenght = name.count
    if lenght == 1 {
        return "*@\(appendix)"
    }
    let semiLenght = lenght / 2

    var suffixSemiLenght = semiLenght
    if (lenght % 2 == 1) {
        suffixSemiLenght += 1
    }

    let prefix = String(repeating: "*", count: semiLenght)
    let lastPart = String(name.suffix(suffixSemiLenght))

    let result = "\(prefix)\(lastPart)@\(appendix)"
    return result
}
let email = "[email protected]"
let result = hide(email: email)
print(result)

Answer 2

尝试扩展字符串协议并声明一个返回.init的变量（重复：，计数）：

extension StringProtocol {
    var masked: String {
        return String(repeating: "•", count: Swift.max(0, count - count/2)) + suffix(count/2)
    }
}

用法如下：

let email = "[email protected]"

print(email.masked)   //"••••••••••gmail.com"

如果您希望电子邮件的一部分显示只是操作后缀（count - 3），如下所示：

return String(repeating: "•", count: Swift.max(0, count - count/2)) + suffix(count/2)