随机密码生成器Swift 3? [英] Random Password Generator Swift 3?

问题描述

我正在为iOS构建一个随机密码生成器.其中，按钮会生成一个具有用户选择特征的随机密码(例如，用于打开或关闭大小写字母，字符和符号等的开关).

I'm building a random password generator for iOS. In it, a button generates a random password that has characteristics chosen by the user (e.g. switches to turn on or off lowercase and uppercase letters, characters and symbols, and so on).

UI看起来不错，其余代码运行顺利，但是我无法获得真正生成随机字母数字字符串的按钮.我有一个带有占位符文本(您的密码")的标签，当按下按钮时，该文本应更新为随机字符串，但出现编译器错误:未解析的标识符'length'的使用"

The UI looks great, the rest of the code is working smoothly, but I can't get my button to actually generate a random alphanumerical string. I have a label with some placeholder text ("Your Password") that should have its text updated to a random string when the button is pushed, but I am getting a compiler error: "unresolved use of identifier 'length'"

这是按钮的当前代码:

@IBAction func generatePassword(_ sender: UIButton) {

    let randomPasswordArray: NSString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
    let len = UInt32(randomPasswordArray.length)

    var randomPassword = ""

    for _ in 0 ..< length {
        let rand = arc4random(len)
        var nextChar = randomPasswordArray.character(at: Int(rand))
        randomPassword += NSString(characters: &nextChar, length: 1) as String
    }

    passwordLabel.text = "randomPassword"
}

谢谢！

推荐答案

首先使用允许密码的字符创建一个数组

First create an array with your password allowed characters

let passwordCharacters = Array("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890".characters)

然后选择密码长度

let len = 8 

定义和空字符串密码

var password = ""

创建循环以粘贴您的随机字符

create a loop to gennerate your random characters

for _ in 0..<len {
    // generate a random index based on your array of characters count
    let rand = arc4random_uniform(UInt32(passwordCharacters.count))
    // append the random character to your string
    password.append(passwordCharacters[Int(rand)])
}
print(password)   // "V3VPk5LE"

---

快捷键4

您还可以使用map代替标准循环:

You can also use map instead of a standard loop:

let pswdChars = Array("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890")
let rndPswd = String((0..<len).map{ _ in pswdChars[Int(arc4random_uniform(UInt32(pswdChars.count)))]})
print(rndPswd)   // "oLS1w3bK\n"

Swift 4.2

使用新集合的 randomElement()方法:

let len = 8
let pswdChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
let rndPswd = String((0..<len).compactMap{ _ in pswdChars.randomElement() })
print(rndPswd)   // "3NRQHoiA\n"

这篇关于随机密码生成器Swift 3?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！